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1. 12 dBuV max 2 out of band 30 MHz to 1 GHz excluding in band above 43 dBuV max j with the RF out terminated in 75 Q exhibit an output voltage leakage to the RF in terminal of 36 dBu V max 4 2 5 2 If the STB decoder provides a UHF re modulater the RF output shall be combined with an RF bypass facility that provides feeds for analogue TVs and VCRs The second order intermodulation at the RF output measured in accordance with IEC 60728 5 with 85 dBuV input shall be equal to or lower than 60 dBc 4 2 6 Time Interleaving The DTT receiver shall at least include time interleaving capability corresponding to the maximum time interleaving according to ETSI EN 302 755 i e 2 42 OFDM cells for a data PLP and its common PLP together 4 3 Demultiplexing and decoding 4 3 1 Support of MPEG 4 The STB decoder shall support MPEG 4 AVC H 264 level 3 decoding for standard definition display iDTV receivers shall support MPEG 4 AVC H 264 level 4 decoding for standard definition and high definition display The transport stream shall comply with ISO IEC 13818 1 and the video profile level shall be Main profile level 3 in accordance with ISO IEC 14496 10 The DTT receiver shall support standard definition video resolution of 720 x 576 The DTT receivers supporting HD shall support the following minimum set of resolutions and frame rates Table 6 Video Decoder resolutions and frame rates Resolution Frame Rate S
2. The decoder shall use a standardized RCU protocol In the interest of interoperability it is recommended that manufacturers use the NEC protocol for the RCU 7 1 2 Infrared receiver frequency The infrared carrier frequency for the RCU shall be 38 kHz 7 1 3 Keys and layout 7 1 3 1 It shall be possible to perform the following functions by means of the RCU a enter the program channel number by numeric keys b access and navigate the menu structure c access the Electronic Program Guide Now and Next Banner and Event and program information d confirm an option selection e control the on screen cursor up down left right f exit from the menu and information structure g select the next service up or down P and P h increase or decrease the audio level 1 adjust the audio level to zero mute and restore back to previous setting 3 display and suppress subtitles k toggle between normal and standby operation 1 toggle between television and radio services for STB only Page 55 of 58 m provide a short cut to interactive services and overlay text 7 1 3 2 The RCU may implement all the keys in accordance with the HbbTV profile ETSI TS 102 796 V 1 1 1 7 1 4 Operation 7 1 4 1 Response time The design of the DTT receiver and the RCU operating system shall ensure a maximum time of 100 ms between the release of the key and the commencement of the specified response 7 1 4 2 Channel entry All
3. dB 532 12 0 608 12 0 133 11 5 152 11 5 525 11 5 600 11 5 120 11 0 130 11 0 510 10 5 See Note 2 580 10 5 See Note 3 90 9 5 100 9 5 490 9 0 560 9 0 60 7 0 70 7 0 475 7 5 540 7 0 30 2 0 50 4 5 448 2 0 266 2 0 512 2 0 304 2 0 28 2 0 32 2 0 448 2 0 266 2 0 512 2 0 304 2 0 28 2 0 32 2 0 475 7 5 540 7 0 30 2 0 50 4 5 490 9 0 See Note 2 560 9 0 See Note 3 60 7 0 70 7 0 510 10 5 580 10 5 90 9 5 100 9 5 Page 23 of 58 Identifier Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6 Band UHF IV V UHF IV V VHF III VHF II UHF IV V VHF III 8MHz SFN 8MHz SFN 7MHz SFN 7MHz SFN SMHz MFN 7MHz MFN Section Performance 525 11 5 600 11 5 120 11 0 130 11 0 532 12 0 608 12 0 133 11 5 152 11 5 Notes 1 The performance requirement is based on 30 seconds error free video Za 4 There is no allowance for an echo outside the guard interval for 8MHz 19 256 PP4 due to the 19 256 guard interval 266us being very close to the Nyquist limit for PP4 298 67us This specification defines the maximum delay for an echo outside the guard interval to be 57 64 Nyquist which is equal to the guard interval of 266usec for 19 256 PP4 There is no allowance for an echo outside the guard interval for 7MHz 19 256 PP4 due to the 19 256 guard interval 304us being very close to the Nyquist limit for PP4 341 3us This
4. 11 1 1 Bi colour LEDs The STB receiver shall have a minimum of two bi colour LEDs LED 1 and LED 2 on the front panel The two LEDs shall be clearly distinguishable from each other either by their physical position separation left side LED and right side LED or by means of a label LED 1 shall be defined as the Power LED on the left hand side LED 2 shall be defined as the Status LED on the right hand side The colours of the Power LED shall be Red Green The colours of the Status LED shall be Red Green 4 11 1 2 The Power LED Red Green The Power LED indications shall be as follows Standby Red Operate Green Reception of RCU command flashing single burst 4 11 1 3 The Status LED Red Green The Status LED indications in STB shall be as follows System boot program search flashing Green Normal operation continuous Green Page 42 of 58 Fault no signal found continuous Red Software download in progress flashing Red 4 11 2 Controls The following controls shall be provided on the front panel of STB receiver iDTV shall have the following controls at a place around the front panel that the user can operate easily e Program selector P and P e Volume selector V and V e Menu e Ok e Standby On 4 11 3 Connectors The following connectors shall be used a An RF input female connector that complies with IEC 61169 2 b An RF output male connector that complies with IEC 61169 2
5. 2 2 6 Factory reset The DTT receiver shall include the provision for restoring the factory default settings in response to a user instruction This shall return the Receiver to the state in which it left the factory with all locally stored data for example user preferences PINs channel lists etc removed In STB only the factory reset function shall also be triggered by a defined sequence of key presses of the front panel buttons 1 e without the need for an RCU 6 2 2 3 Display 6 2 2 3 1 Now and Next Banner display time There shall be a setting to control the duration that the Now and Next Banner is displayed in the STB receiver Values for the display time options can be defined between 1 s and 10 s in increments of 1 second 6 2 2 4 Parental control Parental control parameters support the operation of parental control as described in 6 5 This includes the setting and resetting of PINs for both content access and access to the parental control settings the activation of the parental control mode and the setting of the age threshold 6 3 Operation at first time switch on The DTT receiver when shipped by the manufacturer shall not have any preset information stored in the NVRAM When the decoder is switched on for the first time and it detects that the NVRAM is clear a banner shall be displayed indicating that no preset information is present The following sequence of configuration screens shall be displayed a Langua
6. 3 bitstream for output via HDMI only STB and SPDIF If this option is supported the decoding and conversion of an E AC 3 elementary stream shall conform to the requirements defined in ETSI TS 102 366 including annex E and the following constraints Support for decoding MPEG 1 Layer II Musicam is optional The decoder shall use the ISO 639 language descriptors to determine languages of audio service elements handle dynamic changes and present audio service information 4 3 3 2 Audio mode HD Receivers shall be capable of decoding the first independent substream of an E AC 3 elementary stream independent substream 0 containing up to 5 1 channels of audio HD Receivers shall implement E AC 3 decoding functionality that is capable of outputting at least 2 channels of decoded PCM HD Receivers shall support down mixing of E AC 3 streams that contain more than 2 channels of audio 4 3 3 3 Bit rate HD Receivers shall support decoding of E AC 3 elementary streams encoded at bit rates of up to 3 024 kbit s 4 3 3 4 Sampling frequency HD Receivers shall support decoding of E AC 3 elementary streams encoded at a sample rate of 48 kHz 4 3 3 5 Substream support HD Receivers shall be able to accept E AC 3 elementary streams that contain more than one substream HD Receivers shall be capable of decoding independent substream 0 Support for decoding of additional dependent substreams is optional 4 3 3 6 Audio Description HD Receivers sha
7. EMC 8 2 1 The DTT receiver and all accessories shall comply with the following standards a Emissions CISPR 13 Sound and television broadcast receivers and associated equipment Radio disturbance characteristics Limits and methods of measurement b Immunity CISPR 20 Sound and television broadcast receivers and associated equipment Immunity characteristics Limits and methods of measurement 8 3 Performance Compliance of the DTT receiver and the RCU with the performance requirements shall be tested using the relevant test methods which shall be defined as part of the conformance regime 9 Accessories 9 1 The Receiver shall be supplied with the accessories given in 9 2 to 9 8 Page 57 of 58 9 2 STB only 230 V a c to 12 V d c converter 9 3 Mains cord set of length at least 1 5 m and incorporates a plug and an appliance connector Type G British BS 1363 9 4 Composite CVBS video stereo audio cable of length at least 1 5 m terminated with RCA connectors only for STB 9 5 Remote control unit RCU that complies with the requirements in clause 7 together with AA or AAA sized batteries 9 6 User manual in English Paper Electronic 9 7 Quick guide in English that contains a basic wiring diagram which shows alternative connections for installations with and without a VCR and with and without baseband video and audio input to the television display 10 Packaging 10 1The DTT receiver sh
8. EPG 5 2 2 EPG Updating When the user accesses the EPG it shall be displayed regardless of the state of the receiver s schedule database for example database is partially populated in the minutes after power on In normal operation the Receiver shall maintain the full EPG up to date and be able to display the full EPG within 10 seconds of selection The Receiver shall display EPG information as soon as it is received without requiring user interaction to update the display 5 2 3 EPG and Local time The EPG shall always display events with the correct local time offset which applies at the time for which the event is billed By default where present the guidance text should be displayed as part of the programme guide whenever the synopsis is displayed 5 3 Secure downloads and updates 5 3 1 Support for downloads The DTT receiver shall support over the air downloads of authorized software 5 3 2 Over the air updates Over the air updates shall use the DVB System Software Update mechanism DVB SSU Simple profile specified in ETSI TS 102 006 Each software release has a unique model or version reference which shall be used by the Receiver to establish whether it is to be downloaded The DTT receiver shall only respond to updates that contain this unique identifier In particular the Receiver shall not respond to updates targeted at other Receiver models produced by the same manufacturer The system shall allow for separa
9. QAM 64 QAM 64 QAM TIME _IL_LENGTH 3 3 2 2 3 3 TIME_IL_TYPE 0 0 0 0 0 0 Frame_Interval _JUMP 1 1 1 1 1 1 Lf no of symbols frame 60 62 44 42 60 60 No of FEC blocks per interleaving frame 185 200 132 132 200 195 Bitrates Mbits s 37 12 36 15 31 59 30 81 44 79 38 21 Page 20 of 58 Table 5 Performance Requirements for the limited set of DVB T2 modes Identifier Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6 Band UHF IV V UHF IV V VHF II VHF HI UHF IV V VHF III 8MHz SFN 8MHz SFN 7MHz SFN 7MHz SFN 8MHz MFN 7MHz MFN Section Performance C N Performance on 10 Gassian channel dB 22 9 20 4 22 9 20 4 21 7 21 7 C N Performance on 2 0 OdBechowohamel dB 27 9 24 6 27 9 24 6 26 6 26 6 Minimum receiver del OS 76 2 78 7 76 8 79 3 77 4 78 0 Gaussian channel dBm Minimum receiver 4 0 signal input levels on 71 2 74 5 71 8 75 1 72 5 73 1 OdB echo channel 5 0 Receiver noise figure on Gaussian channel 6 0 6 0 6 0 6 0 6 0 6 0 dB Maximum receiver 6 0 signal input levels 35 0 35 0 35 0 35 0 35 0 35 0 dBm Immunity to digital signals in Other Channels Digital ACI N 1 C I 28 0 28 0 28 28 28 0 28 Page 21 of 58 Identifier Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6 Band UHF IV V UHF IV V VHF II VHF HI UHF IV V VHF II 8MHz SFN 8MHz SFN 7MHz SEN 7MHz SEN MHz MEN 7MHz MFN Section Performance 7 0
10. dB a See 38 0 38 0 38 0 38 0 38 0 38 0 Di Nae 28 0 28 0 28 0 28 0 28 0 28 0 dB Immunity to Co Channel 8 0 Interference from Analogue TV Signals AS ESO 7 0 5 0 7 0 5 0 7 0 7 0 dB Immunity to Adjacent 9 0 Channel Interference From Analogue TV Signals PAL B G AGI C I Note 4 Note 4 N 1 dB 33 0 33 0 33 0 33 0 33 0 33 0 PAL B G AGI C I N 2 dB 44 0 44 0 44 0 44 0 44 0 44 0 PAL B G AGI C I N 9 dB 44 0 44 0 44 0 44 0 44 0 44 0 Performance in Time Varying 10 0 Channels 10Hz 3 dB 3 dB 3 dB 3 dB 3 dB 3 dB doppler 5Hz after Page 22 of 58 Identifier Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6 Band UHF IV V UHF IV V VHF III VHF II UHF IV V VHF III 8MHz SFN 8MHz SFN 7MHz SFN 7MHz SFN 8MHz MFN 7MHz MEN Section Performance AFC 20us 0dB echo Synchronisation for 11 0 varying echo power 31 0 28 1 31 0 28 1 31 0 31 0 levels in SFN dB C N D Performance Hee O 27 9 24 6 27 9 24 6 26 6 26 6 Networks for more than one echo dB 13 0 C N D Performance in Single Frequency Networks inside the 27 9 24 6 27 9 24 6 26 6 26 6 guard interval dB 14 0 CAN D Performance Delay Echo Delay Echo Delay Echo Delay Echo Delay Echo Delay Echo in Single Frequency level level level level level level Networks outside the HS are 45 dBc 15 dBc WS aper E9 apo ES ase guard interval
11. for STB receiver c Colour coded RCA sockets for composite CVBS video and stereo audio output for STB input for iDTV d A DC power jack of 9 5 mm in length outside diameter OD of 5 5 mm centre pin of 2 5 mm and with the centre pin as 12 V and the outer contact as earth for STB receiver e A USB 2 0 port via a USB type A jack optional f HDMI input type A optional for STB mandatory for iDTV g S PDIF output optional for STB mandatory for iDTV h The use of a C8 AC power inlet in accordance with IEC 60320 1 for the power supply built into the DTT receiver for STB receiver Page 43 of 58 4 11 4 Identification The decoder shall have an external label with the following information a identification of the manufacturer or the supplier or both b model number of the decoder c serial number of the decoder 5 Applications 5 1 HbbTV interactive application environment The DTT receiver may implement all mandatory requirements of ETSI TS 102 796 V 1 1 1 Hybrid Broadcast Broadband TV HbbTV 5 2 Electronic Program Guide EPG Receiver shall provide a programme guide It is preferable that this uses data from the transmitted DVB EIT schedule tables This is because these tables are continually updated by broadcasters to reflect schedule changes If the source of the schedule data is ElTschedule acquisition shall be continuous and not dependent upon the reception of the first sections of any tables fo
12. i lt number_of_services i service_id Uimsbf visible service flag 1 Bslbf reserved future use Bslbf logical channel number Uimsbf Page 36 of 58 4 6 2 3 Channel Numbering The Logical Channel Numbers shall be obtained from the LCN descriptor as outlined above The channel map shall be from 1 999 with valid LCN s being assigned in the range from 1 799 by the broadcaster The details of the channel map are outlined below LCN Range 1 799 Services Assigned as per Logical Channel Descriptor Will contain all types of services including Radio Data Video LCN Range 800 999 Services inserted based rules outlined here Figure 4 Channel Map when there is a Valid LCN Descriptor Main Area Services shall be ordered here according to the channel map as described by the Logical Channel Descriptor If no valid Logical Channel Descriptor exists please refer to the no logical channel descriptor section below Overflow area Below is the list of different categories within the overflow area In country invalid LCN Any service which has not been assigned a Logical Channel Number or has been assigned a number outside the valid range of 1 799 shall be placed in the overflow area This section should only be used when there is a valid Logical Channel Descriptor within the network Please refer to the no logical channel descriptor section below Foreign Services Any service belonging to an original network other than th
13. performance requirement Table 1 Main hardware firmware functions for the various IRD configurations Video decoding processing a MPEG 2 MP ML SDTV video MESA ES MPEG 4 AVC HP L4 HDTV Audio decoding processing MPEG 4 AVC HP L3 SDTV Page 16 of 58 E AC3 including down mix to stereo E AC3 E AC3 converted to AC3 digital output HE AAC V2 Mono or stereo audio pairs Subtitling DVB SDTV subtitling API DVB HbbTV DVB T front end DVB T front end UHF re modulator 100 250V AC M M M M M M M Mandatory O Optional 4 1 Spectrum and DTT modulation and coding 4 1 1 Spectrum The Receiver shall operate within the VHF and UHF television broadcasting bands as shown in Table 2 Table 2 Mandatory Frequency Bands Bama Frequency Channel Requirement Page 17 of 58 Tn o 4 1 2 DTT modulation and coding The receiver shall support the 8K mode of operation referenced in the DVB T standard ETSI EN 300 744 The decoder shall be capable of achieving full specified performance with any of the combinations of modulation QPSK 16QAM 64QAM forward error correction coding and guard interval as specified in ETSI EN 300 744 The receiver shall support the 16K and 32 K modes as well as the normal and extended carrier modes as defined in ETSI EN 302 755 The decoder shall be capable of achieving full specified performance with any of the combinations of modulation QPSK 16QAM 64QAM 256QAM fo
14. ratio conmninnnninnnnnnnnericncnrinnn narrar nn 29 Table 8 ISO 639 codes for some languages spoken in Ghana 34 List of Abbreviations and symbols AC 3 Audio coding 3 Dolby Digital used for 5 1 multichannel digital audio AD audio description AFC automatic frequency control AFD active format descriptor AFNOR Association Francaise de Normalisation API Application Programming Interface BAT bouquet association table BCD Binary Coded Decimal BDR Broadcast Discovery Record part of SD amp S BER bit error rate BOOTP Bootstrap Protocol bslbf bit string left bit first bw bandwidth CAN D ratio of carrier to noise plus interference C N carrier to noise ratio CATV Community Antenna Television CEA Consumer Electronics Association North American Association CENELEC Comit Europ en de Normalisation Electrotechnique CI Common Interface CID Content Identifier descriptor CIF Common Intermediate Format COFDM coded orthogonal frequency division multiplexing CPU central processing unit CRC cyclic redundancy check CRID Content Reference Identifier CSO Composite Second Order CTB Composite Triple Beat CVBS composite video baseband signal D A Digital to Analogue converter DAD Default Authority Descriptor DAVIC Digital Audio Visual Council dBFS dB Full Scale D
15. transmission with the highest quality as defined by signal strength and signal quality shall be the one chosen to be entered into the service list 4 2 2 3 Manual tuning In addition to automatic tuning the Receiver decoder shall be capable of performing manual tuning where the channel number or frequency or both is entered by the viewer The decoder shall tune to the channel entered by the viewer search all available DTT modes add any new services and replace existing services in the service list The decoder shall display a given service only once in the service list so avoiding duplicates of the same service even if this service i e same path comprising original network identifier transport stream identifier and service identifier is received from more than one transmitter In such a case the service emanating from the transmission with the highest quality as defined by signal strength and signal quality shall be the one chosen to be entered into the service list Page 25 of 58 4 2 3 Response to changes in modulation The DTT receiver should recover from changes in modulation parameters and output an error free TS This should take less than one second for any change The DTT receiver should be able to detect a change of modulation parameters signalled in the TPS data of the DVB T signal in order to reduce the recovery time The DTT receiver decoder tuned to a DVB T2 transmission shall automatically recover from changes i
16. 4 Figure 3 Digital Ghana Thumb Logo indicating conformance of STBs to Ghana s minimum requirements With immediate effect there shall be no manufacture assembly importation marketing or sale of a set top box STB for Digital Terrestrial Television which does not conform to the requirements specified in this document 12 The objective of this document is to ensure a DTT receiver which will provide good quality video and sound for the viewer and to ensure the lowest possible cost for the free to air receiver This document therefore sets requirements for a free to air DTT receiver which will result in a low cost low maintenance unit providing basic functionality i e demodulating the DVB T DVB T2 signal and decoding the MPEG 2 MPEG 4 programme broadcasts and an Electronic Program Guide EPG providing details of the available services The Ghana DTT receiver standard is based on DVB T2 MPEG 4 Since DVB T2 is backward compatible with DVB T whether MPEG 2 or MPEG 4 it would be able to receive existing SDTV transmissions from Skyy Digital and Cable Gold which are based on DVB T MPEG 2 and DVB T MPEG 4 respectively However these services are expected to be upgraded to DVB T2 MPEG 4 by analogue switch off Ghana Broadcasting Corporation GBC which is currently carrying out a Pilot DTT service based on DVB T MPEG 4 shall carry out its nationwide DTT service in DVB T2 MPEG 4 Requirements in this specification may be assigned t
17. AAC ISO IEC 14496 3 Information technology Coding of audio visual objects Part 3 Audio ISO IEC 14496 10 Information technology Coding of audio visual objects Part 10 Advanced video coding ISO IEC 13818 1 Information technology Generic coding of moving pictures and associated audio information Systems Page 15 of 58 e ITU R BT 624 4 Characteristics of television systems 3 Definitions For the purposes of this document the following definitions 3 1 Audio Description Ancillary service primarily provided for the visually impaired that provides a spoken description of the video component of a service 3 2 Digital Terrestrial Television DTT Terrestrial delivery of digital transmissions in the UHF VHF frequency bands using the DVB T2 standard as set out in ETSI EN 302755 3 3 Free to Air Service which is broadcast unencrypted or in the clear and capable of being received without payment of subscription fees 3 4 Multiplex mux Group of digital terrestrial television or audio programme channels or data services that are combined together into one output signal for broadcast 3 5 Private Data Stream DVB data stream designed for a specific application which is ignored by other DVB decoders that are not designed to use the data 4 Performance requirements Table 1 indicates some of the major hardware and firmware functions in the DTT receiver Detailed requirements are specified in the appropriate
18. BMC Digital Broadcasting Migration Committee DDS Display definition segment DDWG Digital Display Working Group DECT Digital Enhanced Cordless Telecommunications DHCP Dynamic Host Configuration Protocol DSB Double Side Band DSM CC Digital Storage Media Command and Control DTT digital terrestrial television DVB Digital Video Broadcasting DVB C Digital Video Broadcasting Cable DVB CAM CA module that complies with the DVB Common Interface specification DVB data Digital Video Broadcasting Data Broadcasting DVB MHP Digital Video Broadcasting Multimedia Home Platform DVB S Digital Video Broadcasting Satellite DVB T2 Second generation digital terrestrial televison broadcasting system DVB T DVB Terrestrial E AC3 Enhanced audio coding 3 E EDID Enhanced Extended Display Identification Data EBU European Broadcasting Union ECCA European Cable Communications Association ECL EuroCableLabs technical cell of ECCA EEPROM electrically erasable programmable read only memory EICTA European Information amp Communications Technology Industry Vv Association EIT event information table EITf Event Information Table following table section of EITp f EITp Event Information Table present table section of EITp f EITp f Event Information Table present following tables EITsch Event Information Table schedule tables EPG electronic
19. NATIONAL COMMUNICATIONS AUTHORITY MINIMUM REQUIREMENTS FOR RECEIVERS OF FREE TO AIR DIGITAL TERRESTRIAL TELEVISION DTT EN GHANA v1 0 January 2013 Table of Contents Listor Tables e do iv FIVE OCCULT inginer a ana E ha nae e aao a a E EEEn 10 I o e neh ad nates O 14 2 Normativo refer n eSensoi la toi ico is 14 3 Definitions abbreviations and symbols oooooonnncccnnncccnoncccnonononnnnccnnncnononcncnnncnnnnncno 16 3i A e aa nc a a ES Error Bookmark not defined 3 2 Abbreviations and symbols dd Gauss ds tensa aos saede Sivoacsvs same beoase ees iv A Performance A a eas Goes Aa oa eee aden cae 16 4 1 Spectrum and DTT modulation and coding oooccooccccnuccconancnnonanononaninnnccnnnnnno 17 AD Radio TeQueney a 18 4 3 Demultiplexing and decoding i icc5 csccisck jesccssuadae es deveaatandedacveneseedensadaacsdecscedde 27 44 Sub ini ea 33 4 5 VeleteX tinct nanunua na Ra nea 34 4 6 Service information SI and program specific information PSI 34 BET Ea 1O Yeasts rh E EE E fete ets E E meson T E 39 de Graphics capabilities ls 40 4 97 TA IA oe 40 4 TO Powersupply as 41 PAM Interfaces oi iiie ienigst delet at Nath ae erho e et r es Eii Gent 42 Dic PPC ds e dd E E e e ad 44 5 1 HbbTV interactive application ENVITONMENt ooooonnccnoncconnonancnnncnonnnnnnnnnn nono nanns 44 5 2 Electronic Program Guide LPO isc IA de ii ida 44 5 3 Secure downloads and UPAates si cessscvcvescessercesansseedscav
20. Receiver shall allow the user to configure the preferred first and second language subtitle services which will be automatically displayed when available Should neither be available the first available subtitle language shall be presented The decoder shall provide the option of disabling the language presented or of selecting another available language The presence of subtitle services shall be indicated by a subtitle icon on the Now and Next Banner When the languages button is selected on the remote control unit the list of available subtitle languages shall be displayed and the user can select his preference The Receiver shall be capable of displaying subtitling and interactive graphics simultaneously where available 4 5 Teletext Teletext services shall be provided in accordance with ETSI EN 300 472 4 6 Service information SI and program specific information PSI 4 6 1 Service information tables The general implementation of SI and PSI shall be in accordance with ETSI EN 300 744 and ETSI EN 300 468 The DTT receiver shall be able to process the PSI SI tables including the Mandatory and Optional PSI SI tables both for the Actual and for Other transport streams Page 34 of 58 4 6 2 Networks and bouquets It is anticipated that bouquets will be allocated on a regional basis Services will be broadcast on both a national and regional basis with the SI tables containing information on all events The DTT receiver s
21. acters of the name of the Channel List The maximum length of the channel list name shall be 23 bytes char This is an 8 bit field A string of character fields specify the name of the channel list the channel_list_name channel_list_name shall have a maximum length of 23 characters Text information shall be coded using character table 00 as defined in Annex A of EN 300 468 country_code This 24 bit field identifies a country using the 3 character code as specified in ISO 3166 Each character is coded into 8 bits according to ISO 8859 1 and inserted in order into the 24 bit field This shall be set to GHA service_id A service_id that belongs to the TS i e services from transport streams not in the current loop shall not appear One service may only be listed once in each channel list but may belong to be listed in more than one channel list visible_service_flag 1 visible 0 Not Visible reserved All reserved bits shall be set to 1 The receiver shall ignore these bits logic_channel_number This is the broadcasters preferred Logical Channel Number for the service in question Rules of operation are as per LCN Management section of this specification Logical channel v2 descriptor descriptor tag Uimsbf descriptor_length Uimsbf for 1 0 1 lt N 1 channel list id Uimsbf channel list name length Uimsbf for i 0 1 lt N 1 char Uimsbf 1 J country_code Uimsbf descriptor_length Uimsbf for i 0
22. all be securely packaged to protect it against possible damage during transit 10 2The packaging shall contain all the accessories set out in clause 9 and the following information which shall be visible on the outside of the packaging a the identification of the manufacturer b the model number of the decoder c the serial number of the decoder 10 3The means of disposal for the DTT receiver shall be indicated on the packaging and in the user manual Page 58 of 58
23. ate Update option shall allow the user to start the update process manually rather than wait for the normal update during standby operation 6 2 2 2 5 System information and diagnostics 6 2 2 2 5 1 Diagnostics Screen A diagnostics screen shall provide the following information a hardware and software version numbers b middleware and other resident application version numbers for STB only c the received multiplex s indications of signal strength 6 2 2 2 5 1 1 Signal strength and quality Indicators A signal strength Indicator and a signal quality indicator shall be provided for as on screen display The on the screen display or bar shall be colour coded to indicate in tolerance marginal and out of tolerance conditions The display shall be supported by a text description or colour bar that indicates a signal OK or green colour bar b signal marginal or yellow colour bar c signal poor too low or red colour bar 6 2 2 2 5 1 2 Signal Strength Indicator Page 50 of 58 The DTT receiver shall be provided with a signal strength indicator SSI The value for the SSI shall be referred to the RF signal input The absolute accuracy may be 5 dB at RF signal input levels 80 dBm to 60 dBm and 7 dB for RF signal input levels higher than 60 dBm The relative accuracy should be 3 dB between centre frequencies within one frequency band e g VHF Band III or UHF Band IV V supported by the receiver Signal strength indicator shall ha
24. canning Aspect Profile Ratio Page 27 of 58 Resolution Frame Rate Scanning Aspect Profile Ratio 720 x 576 25 Interlaced 4 3 or 16 9 AVC HP L3 1280x720 50 Progressive 16 9 AVC HP L4 1 920 x 1080 25 Interlaced 16 9 AVC HP L4 1 440 x 1 080 25 Interlaced 16 9 AVC HP L4 1 920 x 1 080 25 Progressive 16 9 AVC HP L4 4 3 2 Video Video decoding shall be in accordance with 4 3 1 For STBs supporting HD the DTT receiver shall provide a HD output and a down converted SD output 4 3 2 1 STB decoder down conversion of High Definition Video for Standard Definition output For RF PAL and CVBS outputs the decoded HD video shall be down converted by the SD Format Converter to SD resolution for output via these outputs Down conversion of pictures shall be implemented from any of the incoming encoded HD full screen luminance resolution values 1920x1080 1440x1080 and 1280x720 to SD resolution 720x576 When down converting any 1 1 pixel aspect ratio format i e 1280x720 or 1920x1080 in the Decoder Composition Output to 720x576 resolution the target shall be 702x576 pixels to be centered in the 720x576 grid with nine black pixels inserted as the start of the 720 pixel active line and nine pixels inserted as the end of the 720 pixel active line The Down converted HD video shall be displayed as 16 9 letter box on 4 3 displays Allowing centre cut would limit the safe area to 4 3 for HD production hence not an allowed display o
25. consumer purchases in order to use DTT services in Ghana 1 4 The term iDTV or iDTV receiver or in this document refers to an integrated digital TV set GDTV that the consumer purchases in order to use DTT services in Ghana 1 5 Compliance to this standard is mandatory for all set top boxes and television sets and any receiver that shall be sold in Ghana for the purpose of receiving DTT services 1 6 The standard specifies which functionalities are mandatory and those which are optional 1 7 All Standard Definition SD functionalities shall be mandatory for all DTT Receivers 1 8 High Definition HD functionalities are mandatory for iDTVs but optional for STBs 1 9 The standard concerns a broadcasters b broadcasting signal distributors c TV and set top box manufacturers d TV and set top box dealers and sellers e TV installers f General public 2 Normative references The following referenced documents are indispensable for the application of this document For dated references only the edition cited applies For undated references the latest edition of the referenced document including any amendments applies Information on currently valid national and international standards can be obtained from the Ghana Standards Authority GSA Standards Division Page 14 of 58 ETSI EN 302 755 Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting syst
26. d the following standards for Digital Terrestrial Television DTT in Ghana a Transmission standard ETSI EN 302 755 popularly called DVB T2 Page 10 of 58 b Compression technology ISO IEC 14496 Advanced Video Coding AVC MPEG 4 part 10 High Efficiency Advanced Audio Coding HE AAC c Format Standard Definition SD High Definition HD is optional for STBs but mandatory for iDTVs d Optional Application Programming Interface API for additional and interactive services ETSI TS 102 796 Hybrid Broadcast Broadband TV HbbTV During the digital television transition viewers would require TV sets with the capability of receiving digital television signals transmitted according to the standards above f antenna Free to Air digital signals Integrated Digital TV MPEG 4 DVB T2 Figure 1 Reception of Free to Air digital signals using integrated digital TV set Viewers whose TV sets are able to receive only analogue signals will need to use special digital adapters i e set top boxes which have the primary function of converting digital input to analogue output signals S lt TV set set top box Free to Air digital signals Analogue signals Figure 2 Reception of Digital TV signals using analogue TV Set and a set top box 11 Viewers who may have integrated digital sets based on DVB T MPEG 2 or DVB T MPEG 4 standard would not be conforming to the Ghana standard DVB T2 MPEG 4 and would als
27. ded Audio Multiplex NIT network information table NT Network Termination in general NVOD Near Video On Demand NVRAM non volatile random access memory OSD On Screen Display PAL phase alternating line PAPR Peak to Average Power Ratio PAT Program Association Table PCM pulse code modulation PCR Programme Clock Referance PID Packet Identifier PIN personal identification number PLP Physical Layer Pipe PMT Program Map Table PTS Presentation Time Stamp PSI Program Specific Information PSTN Public Switched Telephone Network Personal Video Recorder same as PDR Personal Digital Recorder or PVR DVR QAM quadrature amplitude modulation QCIF Quarter Common Intermediate Format QEF quasi error free QoS Quality of Service vii QPSK quaternary phase shift keying R code rate r m s root mean square RCA Radio Corporation of America RCU remote control unit RF Radio Frequency RF radio frequency RFC Request For Comments RGB red green blue RoO Rules of Operation ROT Rotated Constellation rpchof remainder polynomial coefficients highest order first RS Reed Solomon RST running status table RTCP Real Time Transport Control Protocol RTP Real Time Transport Protocol RTSP Real Time Streaming Protocol SAP Session Announcement Protocol SD Standard Definition SD amp S Service Discovery and Selection SDT service de
28. e in country original network shall be placed in the overflow area Duplicate Services If two or more unique services unique DVB triplet are assigned the same Logical Channel Number the service belonging to the multiplex with the best RF Page 37 of 58 quality shall be placed in the LCN assigned by the Logical Channel descriptor All other services shall be placed in this category of the overflow area Receivers may implement their own ordering of services within the overflow area When no logical channel descriptor is found within the in country Original Network all in country services shall be assigned Logical Channel Numbers in any order sequential from 1 onwards 1 N Sequentially ordered N 1 Foreign Services Sequentially ordered Figure 5 Illustration of Channel Map when LCN descriptor is not broadcasted Services from the original network of foreign countries shall be placed immediately after the last in country service When there are duplicate services same DVB triplet only the service from the multiplex with the best RF quality shall be visible to the user the duplicate shall not be assigned a logical channel number 4 6 2 4 Regional Broadcast Management A regional multiplex might contain one or more services which have events that differ from one region to another The receiver shall decode the Logical Channel Descriptor Version 2 as outlined above During initial install all channel lists for the country s
29. ebes cassavesadegeounadassecesewes 45 Gap Usera ana arden T spcta ut amiitus ato T cea nated 46 6 1 Now and Next Baer ia 46 6 27 Onescreet Menu navidad tl Wied 47 6 3 Operation at first time switch on ocoocccnnncccnoncconononcnnnnncnnnanonnncnonnnnnononcnnnnncnnns 52 6 4 Time and date information sind lis 53 A Parental A od al 53 7 Remote control unit RCU ooooooocnnnnoconononononanonononnnannnononcnnnocnononnnonononcncononnnnanannnos 55 FL Minima functionality a A a eee BQ 55 Ts Alternative RES ES 56 Ta ARC ADIUNUY suteen a aman ides aaa a feat forsee eh aerate uactti 56 TA PACKAGING ti 57 Bee Compliance A O 57 Sl Health and saf tyo s iost isod e ladies 57 8 2 Electromagnetic compatibility EMC ooocononcccnoniconanoccnoncncnnnnnonnncccnnnnconncninnnos 57 O A a a a e E Se Ried eta eee aaa 57 9 O 57 Ty RI a E E EPS 58 List of Tables Table 1 Main hardware firmware functions for the various IRD Configurations sses 16 Table 2 Mandatory Frequency Bands sccccscccccssceesceceeeeeenceceesceceeceeceaeeeeaaeceeaaeseneeeesaeeeeaaeseeaeeenaees 17 Table 3 Modulation and transmission parameters coocnininnnncannicannnccna cnn narrar 18 Table 4 A limited set of DVB T2 modes for performance requirements mommiicninninninmanncacnccnnnnnas 20 Table 5 Performance Requirements for the limited set of DVB T2 modes 21 Table 6 Video Decoder resolutions and frame rates 27 Table 7 Video Decoder colour frame aspect
30. ed in the EPG SI EIT information The DTT receiver shall suppress both video and audio if the parental rating is above the configuration threshold for the event Unblocking of a parentally blocked event shall be done through the entering of a parental pin Once the event has been unblocked it shall remain unblocked for the duration of the event A change away from the channel and back again shall not require PIN re entry within the timescale of that event When a higher rating is applied to an unblocked event the unblocked event shall be blocked and the user will be required to re enter the parental pin Checking of parental control status and subsequent content suppression if appropriate shall apply across all state transitions e g at switch on coming out of standby at channel change and at event boundaries Page 53 of 58 Parental control pin shall be reset by performing a reset to factory settings The factory default setting shall be parental control disabled 6 5 2 On screen messages If the user has enabled parental control and the rating of the current event is above the trigger level the DTT receiver shall request the entry of a 4 digit parental control PIN before allowing access to the event If an incorrect PIN is entered the decoder shall generate an error message and request re entry During this period it shall be possible to select other services put the Receiver into standby etc but these actions shall not res
31. el Where the deletion option is selected an on screen warning shall be provided that this action will delete the currently saved channels During all scanning operations the DTT receiver shall provide an indication of progress by displaying the number of the channel currently being scanned and the number of services located or indicate the percentage of the scanning progress Where a multiplex is encountered the decoder may display details of its name and network identification together with the signal strength and quality Where more than one multiplex is found to contain the same services the decoder shall prioritize the one that has the best signal strength and quality The decoder shall ensure that there is no duplication of entries in the channel list 6 2 2 2 3 TV settings The TV settings in a to c shall be available a Aspect ratio 1 4 3 2 16 9 b Audio descriptor and audio settings 1 Audio descriptor on off 2 Audio volume offset 3 Audio Language c RF modulator for STBs only Page 49 of 58 It shall be possible to select the output UHF channel number of the RF modulator 6 2 2 2 4 Service updates The service update screen shall contain details of the current software and hardware versions stored in the DTT receiver In addition an indication of whether updates are available shall also be provided A Scan Update option shall allow the user to check for updates Where updates are available an Initi
32. elected by the user shall be collated by the receiver Once the scan is complete if there are more than 1 valid channel list the user shall be given a method to select a preferred list The wording of the selection items presented to the user shall include the 23 character string broadcasted in the descriptor The receiver shall then order the services based on the selected channel list Page 38 of 58 4 6 3 Service configuration The DTT receiver shall automatically detect configuration changes such as service information modulation and frequency as well as the adding or the deleting of services and shall amend its operation accordingly without user intervention or disruption to services NOTE Itis anticipated that the DTT service will include a dynamic element in terms of the use of available bandwidth 4 6 4 EIT present following actual other Only EIT present following Now and Next information shall be broadcast including extended event information for services carried in all DTT transport streams i e EIT present following including genre tables parental control and series descriptor 4 6 5 Time exclusive services The DTT receiver shall support the use of time exclusive services 1 e where part of the multiplex capacity is used to support different services depending upon the time of the day The services shall be shown within the relevant channel listings and users shall be able to select them as for normal services Dur
33. em DVB T2 ETSI EN 300 744 Digital Video Broadcasting DVB Framing structure channel coding and modulation for digital terrestrial television ETSI EN 300 743 Digital Video Broadcasting DVB Subtitling systems ETSI EN 300 472 Digital Video Broadcasting DVB Specification for conveying ITU R System B Teletext in DVB bitstreams ETSI EN 300 468 Specification for Service Information SI in DVB systems ETSI TR 101 211 Digital Video Broadcasting DVB Guidelines on implementation and usage of Service Information SI ETSI TS 101 154 Digital Video Broadcasting DVB Specification for the use of Video and Audio Coding in Broadcasting Applications based on the MPEG 2 Transport Stream ETSI TS 102 006 Digital Video Broadcasting DVB Specification for System Software Update in DVB Systems ETSI TS 102 366 Digital Audio Compression AC 3 E AC 3 Standard IEC 60728 5 Cabled networks for television signals sound signals and interactive services Part 5 Headend equipment ISO IEC 61938 Audio video and audiovisual systems Interconnections and matching values Preferred matching values of analogue signals ISO IEC 13522 5 Information technology Coding of multimedia and hypermedia information Part 5 Support for base level interactive applications ISO IEC 13818 7 Information technology Generic coding of moving pictures and associated audio information Part 7 Advanced Audio Coding
34. eration of the menu structure through the over air update mechanism This shall include the addition of further options within existing pages and also the addition of further pages to the menu structure 6 2 1 3 PIN access option The DTT receiver shall provide the option of requiring the entry of a menu access PIN before displaying the parental control menu and allowing access to its option screens The operation of this function is defined in 6 5 6 2 2 Main Menu screen The Main Menu provides access to all configuration screens including user preferences and installation Installation screens are intended for infrequent access by the user primarily at Page 47 of 58 initial installation and where manual updates are required The following menu options are presented a Languages b Installation c display d parental control Each of these options shall link to a set of supplementary screens of information configuration options as defined in 6 2 2 1 to 6 2 2 7 6 2 2 1 Languages The languages option shall access a list of languages available for the program currently ruming including in a single list audio options subtitles options and audio description Each language shall be accompanied by an icon defining the option as audio subtitle or audio description The list shall include a minimum of two items the default audio of the program and no subtitle Pressing lt OK gt on any of the options shall activate i
35. et the timer and the error message shall be displayed whenever the user returns to that event 6 5 3 Configuration The Menu structure shall include provision for user configuration of parental control settings including the resetting of the PIN sequence changing the PIN sequence and setting the minimum age trigger level Events higher than the parental rating selected by the user shall be blocked for viewing and allow viewing of content with a lower rating In the absence of a parental rating for an event all content shall be parentally blocked The factory default setting shall be parental control disabled The DTT receiver shall support ratings as defined in ETSI TR101 211 i e minimum age rating 3 years 6 5 4 Operation with radio services If a radio service is selected the DTT receiver shall display the relevant Now and Next banner once the service is acquired The banner has the same functionalities and navigation opportunities as for TV channels Optionally if details event information is available the banner shall not time out and shall remain on screen unless alternative content is signalled within SI in which case the banner should time out as for a television service The banner shall move over the screen automatically Page 54 of 58 7 Remote control unit RCU 7 1 Minimum functionality 7 1 1 Protocol Each DTT receiver shall be supplied with an RCU with which the full functionality of the device shall be operated
36. ge the user shall be able to select the language The language menu shall remain until a language has been selected This language selection shall define the language of all subsequent menus b Region selection the user shall be able to select the region if provided Page 52 of 58 c Aspect ratio 4 3 or 16 9 the user shall be able to select the aspect ratio for STB only d Signal acquisition mode the user shall be able to select automatic scan or manual channel selection 1 Automatic scan if the user selects this option the full UHF and VHF band as defined in this specification is scanned The sound channel shall be muted until such time as a valid program is presented In the Receiver at completion of the scanning the following shall be displayed Signal found Subsequently the available program with the lowest program number shall be selected 6 4 Time and date information The DTT receiver shall use the time and date information carried in the relevant SI tables to provide an On screen display in the following screens Menu Page Now and Next Banner 6 5 Parental control 6 5 1 Operation It shall be possible to apply parental control on individual events and complete channels Parental control for individual channels shall be implemented as part of the channel store and preferences function Parental control function for an event or channel shall be controlled by the parental rating contain
37. greed to or adopted by the Republic In furtherance of carrying out this function the law mandates the Authority to determine technical and other standards and issue guidelines for the operation of broadcasting organisations and bodies providing broadcasting services In pursuance of the above mandate the National Communications Authority in conformance to the Geneva 2006 GE06 Agreement is carrying out a transition of television broadcasting services in the frequency bands 174 230 MHz VHF Band IID 470 582 MHz UHF Band IV 582 862 MHz UHF V from analogue to digital technology Digital terrestrial television DTT offers improved spectrum efficiency compared to analogue TV It also offers enhanced video and audio quality interactivity as well as increased programme choices DTT transmissions in Ghana will be based on DVB T2 EN 302 755 and MPEG 4 coding Radio frequency allocated for television broadcasting in Ghana are Bands 174 230 MHz VHF and 470 862MHz UHF Initially the DTT service will be available in parallel with the existing analogue network i e simulcast period but it is anticipated that the analogue TV network will be switched off starting from December 2014 The Authority is mandated by Section 3 a of the National Communications Authority Act 2008 Act 769 to establish and monitor the implementation of national communications standards and ensure compliance accordingly The Authority has therefore adopte
38. h the capability of blending with active video A minimum of 16 individual transparency levels shall be supported 4 8 2 2 Graphics plane front plane that supports full screen On screen display information The sizing of the graphics display plane shall be a 4 3 aspect ratio regardless of the video aspect ratio 4 8 2 3 Video plane that supports a full screen MPEG video stream or still image 4 8 2 4 Background plane back plane that comprises a single colour 24 bit RGB background with a default setting of black 4 9 Standby operation 4 9 1 Passive standby operation Passive standby in STB receiver shall be provided and shall be the main standby mode with the main CPU disabled but the RCU Rx function active and the re modulator bypass active Page 40 of 58 4 9 2 Active standby operation In case it is not possible to provide a passive standby with the power requirements in 4 9 4 c the DTT receiver shall provide an active standby state After selecting standby the STB receiver shall remain in active standby for 5 min before switching to passive standby This mode shall support the downloading of data using DVB SSU including DTT receiver control information if this capability is installed to the DTT receiver Flash memory 4 9 3 Power up times The STB Receiver shall generate an on screen message within 10s of the start of a reboot operation confirming that the decoder is powering up The following time limi
39. hall use the Logical Channel Numbering functionality to construct accurate Now and Next information for the region identified on the appropriate menu screen 4 6 2 1 Logical Channel Number Descriptor LCN information shall be broadcasted via a privately defined LCN descriptor as outlined below This descriptor shall be broadcasted in the TS Loop of the NIT on all multiplexes logical channel deseriptor descriptor tag 8 uimsbf descriptor length S uimsbf for 1 0 number of services i service_id 16 uimsbf visible service flag 1 bslbf reserved 5 bslbf logical channel number 10 uimsbf descriptor_tag this shall be assigned the value 0x83 visible_service_flag 1 visible 0 Not Visible reserved all reserved bits shall be set to 1 The receiver shall ignore these bits service_id DVB defined service id 4 6 2 2 Logical Channel Descriptor V2 The LCN V2 privately defined descriptor may be broadcast This descriptor contains additional information related to sorting of services depending on region Receivers shall support this descriptor if broadcast descriptor_tag This shall be 0x87 decimal 135 channel_list_id This 8 bit id shall uniquely define the Logical Channel List for a particular region This id shall be unique within the Original Network Page 35 of 58 channel _list_name_ length This 8 bit field specifies the number of bytes that follow the channel_list_name_length field for describing char
40. ing TFS Normal Mode or High Efficiency Both Modes to be Supported Mode DTT receiver does not require to demodulate or decode content of FEF FEF and Auxiliary N A parts and auxiliary streams but the streams existence of FEF and or auxiliary streams shall not cause the Receiver to malfunction Page 19 of 58 Table 4 A limited set of DVB T2 modes for performance requirements 1 2 3 4 5 6 7 Identifier Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6 Band UHF IV V UHF IV V VHF MI VHF TI UHF IV V VHF INM 8MHz SFN 8MHz SFN TM Hz SFN 7MMHz SFN 8MHz MEN 7MHz MEN Transmission Mode 32K extended 32K extended 32K normal 32K normal 32K extended 32K normal Constellation 256 QAM ROT 256 QAM ROT 256 QAM ROT 256 QAM ROT 256 QAM ROT 256 QAM ROT Code rate 3 4 2 3 3 4 2 3 3 4 3 4 Guard Interval 1 8 19 256 1 8 1 128 1 128 448us 266us 512us Fees 28us 32us Pilot Pattern PP2 PP4 PP2 PP4 PP7 PP7 PAPR TR PAPR TR PAPR TR PAPR TR PAPR TR PAPR TR PAPR System Characterization SISO MISO SISO SISO SISO SISO SISO SISO FEC Frame Length 64800 64800 64800 64800 64800 64800 Input Mode Single PLP Single PLP Single PLP Single PLP Single PLP Single PLP TFS No No No No No No o Mode NM High Efficiency Mode HEM HEM HEM HEM HEM HEM FEF Not used Not used Not used Not used Not used Not used Auxiliary streams Not used Not used Not used Not used Not used Not used L1 Modulation 64 QAM 64 QAM 64 QAM 64
41. ing decoded presented to the audio decoder for simultaneous decoding In this case the associated service may be reproduced out of sync by as much as 1 2 of a video frame Page 32 of 58 4 3 3 7 Mono audio for STBs There shall be a configurable option in the On screen Menu to replace the analogue Stereo Left signal output via one of the RCA sockets with a derived analogue Mono feed 4 3 3 8 Audio Outputs 4 3 3 8 1 HDMI outputs STB receiver may include an HDMI output as described in section 4 11 3 and the following audio specific requirements shall be implemented a STB receivers shall determine the audio decoding capability of a connected HDMI sink device by reading the E EDID structure of the sink device b If the HDMI sink device indicates support for E AC 3 decoding the STB receiver may output the E AC 3 elementary stream directly to the HDMI sink device c If the HDMI sink device does not indicate support for E AC 3 decoding but supports AC 3 decoding the STB receiver may convert the E AC 3 elementary stream to an AC 3 bitstream prior to HDMI output d If the sink device does not indicate support for either AC 3 or E AC 3 decoding or the user has selected stereo output via the on screen menu the STB receiver may decode the elementary stream to stereo PCM prior to HDMI output 4 3 3 8 2 S PDIF Audio outputs STB receiver may include an S PDIF output as described in section 4 11 3 and the following requirements shal
42. ing the time period when a service is not using the multiplex capacity i e the service is inactive the decoder shall display notification screen the Placeholder which will typically provide the service name and its hours of operation The decoder shall provide seamless transitions between active and inactive states so that the user experiences the replacement of the Placeholder screen with the active service and vice versa 4 7 Memory 4 7 1 The DTT receiver shall have a memory capacity of a 32 Mbytes Flash memory b 128 Mbytes RAM 4 7 2 Settings and parameters for example security related data shall be stored in non volatile memory 4 7 3 Manufacturers may emulate EEPROM in Flash in which case some parts of this data shall be enciphered in the NVRAM Page 39 of 58 4 7 4 The memory specification has been chosen to allow for the lowest component price assuming the use of NAND Flash but manufacturers are free to propose alternative technologies such as a hybrid solution making use of NOR and NAND Flash where these comply with the requirements of this standard 4 8 Graphics capabilities 4 8 1 Resolution The colour resolution shall be at least 16 bits 4 4 4 4 and the DTT receiver shall include a look up table capable of storing a minimum of 256 x 24 bit RGB colour transparency entries 4 8 2 Multiple display planes 4 8 2 1 The DTT receiver shall have three display planes as given in 4 8 2 2 to 4 8 2 4 each wit
43. l be implemented a Convert the E AC 3 elementary stream to AC 3 prior to S PDIF output b Ifthe user has selected stereo output via the on screen menu the STB receiver shall decode the elementary stream to stereo PCM prior to S PDIF output 4 3 3 8 3 Analogue audio outputs STB receiver shall include an analogue audio output as described in section 4 11 3 and decode the audio elementary stream prior to analogue audio output 4 4 Subtitling The DTT receiver shall be capable of displaying subtitles for the hearing impaired in accordance with ETSI EN 300 743 The decoder shall be capable of overlaying the subtitle Page 33 of 58 text on the picture The subtitles for the hearing impaired may differ from the normal subtitles by the amount of text displayed per second which is controlled by the broadcasted content The Receiver shall be capable of displaying subtitles in English and major languages spoken in Ghana including those listed in Table 8 Table 8 ISO 639 codes for some languages spoken in Ghana Language 180 639 Language code 639 1 639 2 639 3 Akan ak aka Ewe ee Ewe Ga Gaa Nzema Nzi Hausa ha hau Dagbani dag The Receiver shall provide the option of Enabling or Disabling the displaying of subtitles When enabled subtitles will automatically be displayed When disabled the decoder shall allow manual selection from the available list of broadcasted subtitle services The
44. l operation of the buffer can resume 4 3 2 4 Outputs for STBs If the STB decoder uses a re modulator a PAL B G modulated SD video and audio signal shall be presented as prescribed in 4 2 5 1 on a connector as defined in 4 11 3 The STB decoder shall also provide a composite CVBS video output on a RCA socket as defined in 4 11 3 The composite video signal levels shall be in accordance with ISO IEC 61938 For decoders supporting HD the decoder shall derive a down converted version for output via this interface as described in 4 3 2 The decoder shall provide a single HDMI output for HD content 4 3 3 Audio The STB Receiver shall support the possibility to adjust the audio delay on the S PDIF output if available up to 250 ms and it should be adjustable in 10 ms steps as the STB Receiver may have several different user set ups resulting in different a v delays e g the STB Receiver may be connected to several types of external audio amplifiers and the STB Receiver may be connected to several types of external screens 4 3 3 1 General The DTT receiver shall support decoding of HE AAC v1L2 and HE AAC v2L2 in accordance with ISO IEC 14496 3 and ISO IEC 13818 7 The use of HE AAC v1L2 and HE AAC v2L2 shall primarily be for mono or stereo video services and or radio services Page 30 of 58 HD Receivers shall support decoding of E AC 3 elementary streams HD Receivers shall also support conversion of E AC 3 elementary streams to an AC
45. ll be capable of simultaneously decoding two different programme elements Main Audio and Audio Description carried either in two separate E AC 3 elementary streams HD Receivers shall in addition to the decoding requirements specified in sections 4 3 3 2 through 4 3 3 5 implement Audio Description decoding with the following capabilities 4 3 3 6 1 Audio mode The Audio Description HD decoder may be capable of decoding a single independent substream from an E AC 3 elementary stream containing up to 5 1 channels of audio The Audio Description HD decoder may be capable of outputting at least 2 channels of decoded Page 31 of 58 PCM The Audio Description HD decoder may support downmixing of E AC 3 streams that contain more than 2 channels of audio 4 3 3 6 2 Sampling frequency The Audio Description HD decoder shall support decoding of E AC 3 sub streams and elementary streams encoded at a sample rate of 48 kHz If the sample rate of the Audio Description service does not match the sample rate of the Main Audio service the HD receiver may decode only the Main Audio service 4 3 3 6 3 Substream support The Audio Description HD decoder shall support decoding of a single independent substream Substream id values of 0 1 2 and 3 shall be supported HD Receivers may be able to select a single independent substream from an E AC 3 elementary stream that contains multiple independent substreams and route this single substream to the Audio Desc
46. n P1 L1 pre signalling data and L1 post signalling An error free TS shall be available within five seconds for any P1 and or L1 pre signalling change An error free TS shall be output within five seconds for any L1 post signalling FEF change and within two seconds for any other L1 post signalling change 4 2 4 Bypass support for STB The path from RF input to RF output shall allow RF bypass independently of the operational or stand by status of the STB decoder so that connected equipment e g a TV set can continue to operate The RF bypass gain shall be in the range 1 dB to 3 dB over the frequency ranges in Table 2 4 2 5 UHF re modulator for STBs 4 2 5 1 If the STB decoder provides a UHF re modulated output for use with a PAL TV receiver it shall a modulate the decoded baseband signal onto PAL G in accordance with ITU R BT 624 4 except that dual side bands shall be allowed b have a peak signal level of 3 mV nominal across 75 2 39 dBm c have a return loss at the output of less than 6 dB d be tunable from 470 MHz to 862 MHz e be preset at the factory to channel 63 f support PAL mono audio output with a volume control g have an audio FM deviation of 40 kHz 5 kHz at 12 dB full scale transmitter output setting equivalent to 6 dBm studio sound level h have a vision to sound carrier ratio of 16 dB 4 dB 1 produce spurious output levels that do not exceed Page 26 of 58 1 in band as in Table 2
47. o STB or to iDTV or to STB amp iDTV according to section 1 3 1 4 and 1 5 of this document If not mentioned the requirement applies to both STB receiver and iDTV receiver All the requirements of this document are mandatory unless it is specifically mentioned as optional Where the document is silent on a specific feature the feature is regarded as being optional The inclusion of optional features can be seen as part of the marketing strategy of the manufacturer Although this document sets out requirements for free to air DTT Receivers receivers promoted by Pay TV operators shall ensure compliance to these requirements The requirements of the TV Licensing Decree 1966 NLCD 89 shall apply to the manufacture assembly importation dealership sale hiring and or repair of Digital Terrestrial Television receivers In addition data shall be collected on STBs in a bid to build a database of the ownership of TVs to which STBs would be connected 13 1 Scope 1 1 This standard sets out the minimum technical requirements for a standard and high definition receiver for free to air digital terrestrial television in Ghana 1 2 The term Receiver or DTT receiver in this document refers to a set top box STB an integrated television set IDTV and any other device that the consumer purchases in order to use DTT services in Ghana 1 3 The term STB or STB receiver in this document refers to a set top box STB that the
48. o access extended event information by a single press of a key on the RCU whilst the Now and Next Banner is displayed or extended event information displays on Now and Next Banner information Page 46 of 58 6 1 1 4 Service options refers to an indication of the presence of additional languages subtitling interactive services audio description and other options associated with the current event Subtitling interactive service and audio description shall be selectable from the RCU and shall not require access to the menu screens 6 1 2 Banner triggering The Now and Next Banner display shall be triggered by a single press of a key on the RCU or the completion of a channel change operation The banner shall not be triggered at event boundaries The banner shall be generated within less than 1 s of the trigger action For STB receiver Now and Next Banner should have a configurable display time The banner display time shall be controlled through a parameter field in the STB configuration menu screen 6 2 On screen Menu 6 2 1 Operation 6 2 1 1 General The Main Menu shall provide access to functional features of the DTT receiver through a structured and explicit organization of these features Short cuts might be provided to access any of the features with a direct access from the RCU in addition to the regular access from the menu 6 2 1 2 Ability to modify menu contents It shall be possible to modify the contents structure and op
49. o need a standard set top box In accordance with Section 5 c of the National Communications Authority Act 2008 Act 769 the Authority shall take the necessary steps to protect consumers from sub standard products In this regard the Authority shall apply its mandate under Section 66 of the Electronic Communications Act 2008 Act 775 to certify terminal equipment of public electronic communications network In pursuance of this mandate the Authority requires that all digital terrestrial television receivers set top boxes and integrated digital television sets sold on the Ghanaian market to conform to the minimum receiver standard published herein To enforce this requirement a conformance regime described in a separate document shall require all STBs and integrated digital TV sets sold in Ghana to pass a conformance test to be certified A logo known as the digital Ghana thumb see Figure 3 has been developed as a certification mark to help consumers and retailers through switchover in Ghana The digital Ghana thumb logo shall be featured in marketing campaigns related to the transition from analogue to digital broadcasting and consumers of Digital Terrestrial Television DTT services shall be told to look for the logo when buying digital TV equipment The logo is designed to identify digital TV products and digital TV services that have been tested and found to conform to Ghana s technical specifications digitalShana
50. program guide EPT effective protection target ESG Event Schedule Guide without any API FEC forward error correction FEF Future Extension Frame FFT fast Fourier transform FTA free to air GAP Generic Access Protocol GOP Group Of Pictures GS Generic Stream HD High Definition HDCP High bandwidth Digital Content Protection HDMI High Definition Multimedia Interface HDTV High Definition Television HE AAC V2 High Efficiency Advanced Audio Coding HbbTV Hybrid Broadcast Broadband TV HTTP HyperText Transfer Protocol IDTV integrated Digital TV IEC International Electrotechnical Commission IEEE Institute for Electrical and Electronic Engineers IEFT Internet Engineering Task Force IGMP Internet Group Management Protocol IMI Instant Metadata Identifier INA Interactive Network Adapter IP Internet Protocol IRD Integrated Receiver ISO International Organisation for Standardisation JTC Joint Technical Committee LCD Logical Channel Descriptor vi LCN logical channel number MAC Medium Access Control MER Modulation Error Ratio MFN multi frequency network MHP Multi Media Home Platform MPEG moving picture experts group MPTS Multi Programme Transport Stream MTU Maximum Transfer Unit NEC Nippon Electric Company NEM Network Element Management NF noise figure NIC Network Interface Card NICAM Near Instantaneous Compan
51. ption The SD Format Converter should apply appropriate re interlacing field mode integration re interlacing It shall process and output 720x576125 in 4 3 frame aspect ratio or 16 9 frame aspect ratio video with colours according to the standards listed in Table 7 Page 28 of 58 Table 7 Video Decoder colour frame aspect ratio Active composition Documentation for Comments resolution in the appropriate Colour Decoder Composition Processing Output Horizontal x Vertical 720x576 ITU R BT 1700 replaces Note that 576 lines in ITU R BT 470 System B both interlaced scan G 5761 and progressive scan 576p shall be processed and output with equal colour parameters 4 3 2 2 Aspect Ratio The DTT receiver shall support both 16 9 widescreen and 4 3 picture format changes including support for the correct aspect ratio and use of the active format descriptor AFD as defined in ETR 101 154 For the HD output the Receiver shall be able to use the EDID information provided by the display to automatically determine the Receiver output The DTT receiver shall provide an Original Format option 1 e to output the same format as received 1f supported by the display as indicated by the EDID information If the received format is not supported the Receiver should select the display mode providing the best possible video quality This is to avoid the Receiver output to go black 1f there is a mismatch between recei
52. r acquisition to start If a Receiver is unable to maintain continuous acquisition such that a section is missed it should be acquired at the next available opportunity Receiver shall concurrently acquire EIT schedule for all receivable services When a receiver caches the EIT information it should ensure that updates to the broadcast EIT tables are reflected in the cache within one cycle of the modified table If an equivalent data source is used but is unavailable the Receiver shall use EIT instead An equivalent data source is defined to be a data source that provides sufficient information in a suitably timely manner to meet all of the mandatory requirements in this chapter The EPG display shall be available at all times excluding standby following initial acquisition Page 44 of 58 5 2 1 EPG Scope and Accuracy The Receiver shall display a minimum of 8 days of schedule data in the EPG subject to the purging of data for past events by the receiver This can be derived from the ElTschedule information recommended because of its accuracy or from an alternative source providing an equivalent level of information When possible the accuracy of the EPG should be improved further by use of the EITp f information Note Broadcasters may delete some or all of the current day s past events during ElTschedule updates Consequently Receiver should not rely on the information about past events in the broadcast schedule when displaying the
53. ription decoder HD Receivers may support Audio Description services delivered within the same E AC 3 bitstream as the Main Audio service and delivered using a separate E AC 3 elementary stream carried in a separate PID within the broadcast transport stream 4 3 3 6 4 Mixing metadata The Audio Description HD decoder shall support extraction of mixing metadata from the E AC 3 bitstream and delivery of this mixing metadata to an audio mixing component within the receiver The AD_Descriptor if present shall be ignored 4 3 3 6 5 Audio Description synchronization requirements If audio access units from two audio services which are to be simultaneously decoded have identical values of PTS indicated in their corresponding PES headers then the corresponding audio access units shall be presented to the audio decoder for simultaneous synchronous decoding Synchronous decoding means that for corresponding audio frames access units corresponding audio samples are presented at the identical time If the PTS values do not match indicating that the audio encoding was not frame synchronous then the audio frames access units of the main audio service may be presented to the audio decoder for decoding and presentation at the time indicated by the PTS An audio description service which is being simultaneously decoded may have its audio frames access units which are in closest time alignment as indicated by the PTS to those of the main service be
54. rward error correction coding and guard interval as specified in ETSI EN 302 755 The decoder shall be capable of achieving full specified performance with any of the modes of operation defined for DVB T2 in ETSI EN 302 755 4 2 Radio frequency 4 2 1 DTT tuner demodulator The receiver shall be provided with a single DTT tuner demodulator for the reception of signals from terrestrial transmitters broadcasting in accordance with ETSI EN 300 744 for DVB T and ETSI EN 302 755 for DVB T2 It shall be capable of receiving transmissions broadcast with any allowable combination of modulation and transmission parameters as follows Table 3 Modulation and transmission parameters QPSK 16 QAM 64 QAM 256 QAM Constellation QPSK 16 QAM 64 QAM olaaa and on otated Code Rate 1 2 2 3 3 4 5 6 7 8 1 2 3 5 2 3 3 4 4 5 5 6 Tu 128 Tu 32 Tu 16 Tu19 256 Tu 8 Guard Interval Tu 32 Tu 16 Tu s Tu 4 Tu19 128 Tu 4 Transmission 2K 8K 1K 2K 4K 8K normal and extended Page 18 of 58 DVB T DVB T2 16K normal and extended 32K normal and extended SISO MISO both to be supported No PAPR used ACE PAPR only used PAPR N A TR PAPR only used ACE and TR PAPR are used FEC Frame length 64800 16200 Mode A single PLP or Input Mode B Multiple PLPs Common PLP Type 1 Input Mode N A a up to the maximum allowed figure The Decoder shall automatically detect which mode is being used frequency Time Frequency Slic
55. scription table SDTV Standard Definition Television SFN single frequency network SI service information SMATV Satellite Master Antenna Television SNTP Simple Network Time Protocol S PDIF Sony Phillips digital interface SPTS Single Programme Transport Stream SSU system software update ST Stuffing Table STB set top box SW Software TCP Transmission Control Protocol TDT time and date table TFS Time Frequency Slicing TFTP Tunnelling File Transfer Protocol viii TOT time offset table TPS transmission parameter signalling TR Tone Reservation TS Transport Stream Tu Useful symbol time TV television UHF ultra high frequency uimsbf unsigned integer most significant bit first UTC Universal Time Co ordinated VCR video cassette recorder VHF very high frequency VHS Video Home System VoIP Voice over IP VPN Virtual Private Network VSB Vestigial SideBand xDSL x Digital Subscriber Line XML Extensible Markup Language a signal defined as colour space luminance Y and colour difference YUV U V Introduction The NATIONAL COMMUNICATIONS AUTHORITY NCA is mandated by Section 2 of the Electronic Communications Act 2008 Act 775 to regulate the radio spectrum designated or allocated for use by broadcasting organisations and providers of broadcasting services in accordance with the standards and requirements of the International Telecommunications Union and its Radio Regulations as a
56. specification defines the maximum delay for an echo outside the guard interval to be 57 64 Nyquist which is equal to the guard interval of 304usec for 19 256 PP4 When there is a PAL B with NICAM N 1 interference in 7MHz channels the DVB T2 signal in channel N must have a frequency offset of at least 166 KHz Page 24 of 58 4 2 2 Tuning 4 2 2 1 General The Decoder shall ignore all services originating from any non DTT sources such as DVB H services to avoid consumer confusion Portable handheld receivers should not ignore DVB H services 4 2 2 2 Automatic tuning The DTT receiver shall be capable of performing automatic tuning over the frequency ranges indicated in Table 2 to find all the multiplexes and services received in the complete frequency range The Receiver shall automatically detect which mode is being used Refer to Table 3 It shall also be able to interpret and respond to tuning parameters found in the SI PSI e g within the network information table NIT When receiving a DVB T2 signal with Multiple PLP i e Mode B the Receiver shall analyse and interrogate the SI information per PLP The decoder shall display a given service only once in the service list so avoiding duplicates of the same service even if this service i e same path comprising original network identifier transport stream identifier and service identifier is received from more than one transmitter In such a case the service emanating from the
57. t and close the list If available the same list can be accessed with the language key on the RCU 6 2 2 1 1 Language selection Pull down menus exist for each of the following each containing specified language options 1 Menu for controlling the language used in the menu screens 2 Audio for configuring the preferred audio component 3 Subtitles for configuring the preferred subtitling component In each case the default language shall be English original It shall be possible to override the selected preferences for audio and subtitles by selections made from the languages list for which information is extracted from the SI EIT 6 2 2 2 Installation 6 2 2 2 1 Country Selection The DTT receiver shall display a country selection menu in which Ghana or West Africa shall be listed 6 2 2 2 2 Channel scanning Channel scanning shall cover the complete range of frequencies as in Table 2 Page 48 of 58 The following three options shall be available a a rescan of the required frequency range to locate and add new or changed services b the deletion of all stored settings and subsequent scan and storage of new ones c the scan of a single multiplex manual search entry of the channel number to be searched When the rescan option is selected the default operation shall be to scan all applicable channels however there shall also be a manual option allowing the user to limit the scan to a specific chann
58. te test keys to enable laboratory and field trial tests of new software without affecting the in field population of decoders Page 45 of 58 Receiver shall be supplied with the download mode enabled such that any updates issued after the production date will immediately be recognized and processed as part of the initial setting up operation 6 User interface 6 1 Now and Next Banner 6 1 1 Operation 6 1 1 1 The DTT receiver shall be capable of displaying a banner message containing key information for the service and event currently accessed The banner shall contain the following minimum information where this is signalled in the SI If the required information is not present in the SI the decoder shall leave the relevant field blank The banner shall include a the name and logical channel number of the current service b the name of the current event c the start and end times of the current event d the parental control rating for the current event e the name and start time of the following event f the service options 6 1 1 2 The DTT receiver shall be able to present the user with information on the present and following event on any channel The Now and Next Banner shall present this information allowing the user to navigate the present and following event information for each channel to access the event description that consists of a minimum of 300 characters for each event 6 1 1 3 It shall also be possible t
59. television radio and interactive services will be assigned a three digit LCN The RCU shall be configured for three digit LCN operation 7 1 4 3 N key rollover The design of the keypad and the RCU operating system shall prevent unintended repeated entries This shall include a delay of 100 ms between the completion of a key press and the recognition of the next entry 7 2 Alternative RCU design It is recommended that manufacturers make available alternative RCUs for those with impaired vision or impaired manual dexterity e g over sized keys and character fonts shaped keys 7 3 Reliability 7 3 1 Robustness The RCU shall be designed to withstand frequent usage it shall have a robust case which is resistant to damage when being dropped onto hard surfaces Page 56 of 58 7 3 2 Environmental The RCU shall be designed to work in the same environmental conditions 1 e ambient temperature and humidity as the DTT receiver 7 4 Packaging The RCU shall be included in the same shipping carton as the DTT receiver The internal packaging shall be sufficient to prevent any damage or scuffing to the RCU during transit Batteries shall be provided separately and packaged to prevent accidental short circuiting during transit 8 Compliance 8 1 Health and safety The DTT receiver and all accessories shall comply with IEC 60065 Audio video and similar electronic apparatus Safety requirements 8 2 Electromagnetic compatibility
60. ts shall apply to transitions in and out of standby operations a DTT receiver Off to Service display a maximum of 20s b Active Standby to Service display a maximum of 5s c Passive Standby to Service display a maximum of 10s 4 9 4 Power consumption The STB together with its power supply shall have the following maximum power consumption a Normal Operation 10W b Standby Active 6 W c Standby Passive 3 W NOTE These values will be reviewed to reduce energy consumption when technology permits 4 10 Power supply The receiver shall be supplied complete with 230 V a c to 12V d c power supply unit The mains supply power unit may at the discretion of the manufacturer be incorporated in the Page 41 of 58 receiver or alternatively be provided as an external module Protection against overvoltage or undervoltage and reversed polarity shall be incorporated A DC power supply of 5 V capable of supplying a maximum current of 100 mA suitable for powering an external antenna amplifier shall be available on the input RF connector of STB The DC power supply should not degrade the performance of the RF input The DC power supply shall be protected against short circuits It shall be possible to switch on or off the DC power supply via a selection in the menu structure The default at first time initialization and resetting to factory default shall be the DC supply switched off 4 11 Interfaces 4 11 1 LED indications 4
61. ve a relative value within a range from 0 to 100 The signal strength indicator shall be updated once per second 6 2 2 2 5 1 3 Signal Quality Indicator The DTT receiver shall be provided with a signal quality indicator SQI The value for the SQI shall be referred to the RF signal input for DVB T signals and for DVB T2 the value for the SQI should be referred to a PLP in the received signal at the RF signal input The absolute accuracy of the C N value reported for DVB T shall be of 1dB for C N values of 17 dB to 27 dB at the RF signal input For DVB T2 the SQI should refer to a PLP in the received signal and its combination of C N and BER before BCH where the signal quality is weighted by the received C N E g PLP without bit error before BCH should be weighted with C N The signal quality indicator shall have a relative value within a range from 0 to 100 and with a resolution of 1 The signal quality indicator shall be updated once per second 6 2 2 2 5 1 4 When a multiplex entry is selected the following information shall be available from OSD screens a channel number b signal strength and average error rate according to 6 2 2 2 5 1 2 c Transport stream ID d Original network ID e network ID f service ID Page 51 of 58 6 2 2 2 5 1 5 An additional text message shall indicate when parameters are out of tolerance for example Low signal level or Poor quality signal or no signal bar is displayed 6 2
62. ved format and display capabilities It shall also be possible to manually set the default output format from the Receiver to a fixed format For the down converted SD format the STB decoder shall support manual selection of the required aspect ratio For SD video and down converted HD video the combination of coded frame aspect ratio information plus the use of the AFD embedded by the MPEG encoder into the video sequence header shall provide the viewer with the following options Page 29 of 58 a 16 9 material on 4 3 displays The decoder shall provide the following viewer options 1 display the material as a 16 9 letterbox within a 4 3 frame or 2 perform a 4 3 centre cut out on the originating material and present this full frame within the 4 3 display In this case the decoder shall support pan and scan operation b 4 3 material on 16 9 displays The decoder shall provide pillarboxing of 4 3 material into a 16 9 frame in order to maintain the correct aspect ratio of the originating material 4 3 2 3 Support of still pictures The DTT receiver shall be able to decode and display still pictures frame i e a video sequence that contains a single intra coded picture Such a video bit stream will cause the buffer to under flow In this situation while the decoding process shall continue to examine the buffer the display process associated with the decoder shall repeat the previously decoded picture until the norma

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