Datasheet - Quadravox, Inc.
Contents
1. The table above lists all the command and error response codes that are required to control the module and correctly interpret its response All commands sent to the module consist of two bytes The first byte send will always be one of the above commands The value of the second byte sent will depend on the command The function of each of these commands will be described in detail below The following examples assume that a PC Personal computer is being used to control the module If an LED is connected to the LED output of the module it will illuminate for the duration that a task is being carried out The BUSY line on the module will also go low for the duration that it is carrying out a task and is unable to respond to serial commands For commands of very short duration the LED will only flicker 2002 J E E Quadravox Inc Preliminary 4 a Formatting the module Before the module can be used to record messages it must first be formatted by sending the following two bytes First Byte Second Byte 253 Oxfd don t care The module will send the OK code 254 Oxfe back to the PC to confirm the function has been completed The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 5 _ _ A EL Setting the sampling rate Sampli2. 0 Features Totally dynamic message recording allowing messages to be of variable length Intelligent message allocation recording and playback algorithm 255 discrete message capacity Individual message erase function Digital volume control 8 discrete steps User selectable sampling rate 4 0 kHz 5 3 kHz 6 4 kHz 8 0 kHz Serial interface simple RS232 TXD amp RXD Controlled using simple 2 byte commands User controllable PWR and AUX outputs to control external amplifiers Sleep function for very low power applications General Description The QV381m0 is the latest in a family of speech recording and playback modules designed to complement the existing range of Quadravox speech products The QV381m0 module employs a sophisticated micro controller running a dynamic message allocation algorithm which in conjunction with the ISD 5008 device offers the user considerable quality and flexibility The module permits messages to be to be recorded at different sampling rates The sampling rate selected will depend very much on the desired quality of the sound being reproduced and also the length of the required message messages The sampling rate can be varied from message to message as required After having selected a suitable sampling rate the user can record playback and erase individual messages on command The user can select a unique message number to record in the range 1 255 which can be of any length within the lim
3. _ _ QV381m0 Record Playback Module User s Manual Designed by James Evans Electronics GB Manufactured by Q uadravox Inc USA 2002 J E E Quadravox Inc Preliminary a CONTENTS Features General Description si 3 QV381m0 Command Sel ssiuiissinasianusausanaunvaserdnnsetaaunensaaneauder 4 Formatting the module snmsensennsennee 5 Setting the sampling rate see vata sac cesieww ecw eds sau senceeneevieet ead saswewndsean canine 6 Recording a MNCSSAG OC ie cance einai ces reas ec er adie eveieeestanie diaries 7 Playing MOSSAGQCs wisidseissieceewssensvienesedwens ween sus senbebwhesuedeunwsunesudwenseubnanden 8 Erasing 4 IMCSSAGC tresses idee 9 Changing the playback volume ss 10 Using the external control lines 11 Putting the module to sleep ensnnsens 12 Query module identification nunnan 13 Query current volume level sise 14 Query current Sampling rate 15 Query the next available message number 16 Query the number of clusters available 17 Query the duration of a recorded message 18 2002 J E E Quadravox Inc Preliminary
4. 254 0xfe OK to the host PC to confirm the request The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 10 _ 10 External control lines Two digital control lines are provided to allow the user to control external equipment e g an amplifier These lines are PWR which is active low and AUX which is active high NB The AUX line has nothing to do with the auxiliary audio output or input it is a digital output line The user can toggle the control lines by sending the following two byte packets First Byte Second Byte 246 0xf6 toggle PWR line don t care First Byte Second Byte 247 0xf7 toggle AUX line don t care The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 11 ee Putting the module to sleep For battery powered applications the module can be put to SLEEP by sending the following two byte packet First Byte Second Byte 250 Oxfa go to sleep don t care Having been powered down the module will not respond to commands over the serial link The BUSY and LED lines will go low for the duration of the command Signifying the ISD device has been powered down The microcontroller will then shut down At this point the BUSY and LED lines will be inactive In order to wake up the module its Reset line must be toggled low high The module will them power
5. 8 _ _ a A Et Erasing a message To erase a stored message the following two byte packet should be sent to the module First Byte Second Byte 251 Oxfb erase message n Where n is the message number to erase 1 255 inclusive When the module receives the packet it first determines if it can carry out the erase function The module tests for the following condition If the condition is true it sends the appropriate response and leaves the erase routine 1 Message Number Does not Exist returns code 221 Oxdd to the PC If the message exists the module will carry out the erase cycle and upon completion send code 254 0xfe OK to the PC The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 9 n Oo Changing the playback volume The volume of the playback can be altered by sending the following two byte packet to the module First Byte Second Byte 252 Oxfc set volume n Where n has the value O0 to 7 0 lt n lt 7 n represents volume attenuation a value of n 0 will provide the loudest playback while a value of n 7 will provide the quietest If the value of n is outside of the acceptable range the module will return code 220 Oxdc Invalid Number the volume will remain unaltered and the module will leave the set volume routine If the requested volume level is in range the module will adjust the playback volume and then send code
6. Quadravox Inc Preliminary 7 ee Playing a message The module can playback messages to either a speaker or to its auxiliary audio output The destination of the playback is chosen by selecting the appropriate command byte as shown below The playback function has the form First Byte Second Byte 240 0xf0 play to speaker n or 241 0xf1 play to auxiliary audio output Where n the message number which refers to a particular message Valid message numbers are 1 to 255 inclusive When the module receives the packet it determines if it can proceed with playback The module tests to see if any of the following conditions are true In the event that one of them is found to be true the module returns the appropriate response and leaves the playback routine 1 Message Number Does Not Exist returns 221 Oxdd to the PC 2 Invalid Number returns 220 Oxdc to the host PC If the requested message to playback does exist the module will send code 254 0xfe OK to the host PC to acknowledge that playback will start At any time playback can be stopped by the host PC by sending code 230 0xe6 Stop The module will then stop playback and send code 254 Oxfe OK back to the PC to acknowledge If the message is allowed to playback to the end the module will send code 254 Oxfe OK to the PC The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary
7. to 255 inclusive When the module receives the packet it first determines if it can carry out the recording The module tests for each of the following conditions If one of the conditions is true the module will return the appropriate response and leave the record routine 1 Message Number To Record Already Exists returns 222 0xde to the PC 2 No Free Clusters returns 224 0xe0 to the PC 3 No Message Numbers Available returns 223 Oxdf to the PC 4 Invalid Number returns 220 Oxdc to the PC As soon as the module is ready to record it will send code 254 Oxfe OK to the PC The PC should then commence playback of the audio file to be stored in the ISD device The recording can be stopped at any time by sending the code 230 0xe6 Stop to the module When the module receives the code 230 Oxe6 Stop it will confirm that it has stopped recording by sending the code 254 Oxfe OK back to the host PC If the module is not stopped whilst recording it will fill the ISD device to capacity and stop the recording function itself Should this stage be reached the module will send the code 224 0xe0 No Free Clusters to the PC After having reached the stage where the ISD device is full any future attempts to record other messages will result in the module sending the code 224 0xe0 No Free Clusters to the PC The Busy and LED lines will go low for the duration of this command 2002 J E E
8. will return two bytes corresponding to the duration of the recorded message If the duration of a non existent message is requested the module will return two zero bytes The bytes are returned as low byte followed by hi byte The bytes together form a 16 bit number which corresponds to the duration of the recorded message in seconds The received bytes must be combined and adjusted to give the duration in seconds The bytes can be combined and adjusted as follows duration seconds hi byte x 256 low byte 100 The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 18 V0 QV381M0 Record Playback Module Incorporating the ISD5008 and PIC16F876 Microcontroller The QV381M0 incorporates a PIC16F876 microcontroller directly powered from 5V applied to the external connector The ISD5008 has its own 3V linear regulator which also derives power from this connector The microcontroller is clocked at 4Mhz The table below describes the function of each pin on the external connector Pin Descriptions pt EE T foo RS232 Transmit line 5V See note 1 oe BUSY Indicates system is busy See note 2 low Mic Electret microphone connection terminal See Note 3 3 ie Electret microphone connection terminal See Note3 6 RECLED Active low LED line See Note 4 7 5V 5V System power See Note 5 5 sen Gpstemgroun 0 9 ANA IN Audi
9. econd Byte 236 0xec Query sampling rate don t care The module will return a single byte corresponding to the current sampling rate The byte will contain one of four possible values corresponding to the sampling rate as shown below 80 0x50 8 0 kHz sampling 64 0x40 6 4 kHz sampling 53 0x35 5 3 kHz sampling 40 0x28 4 0 kHz sampling N B A knowledge of the sampling rate and the number of free clusters makes it possible to determine the amount of recording time remaining The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 15 10 Query the next available message number Since messages can be given any random number within the range 1 to 255 inclusive It is easy to lose track of the next available message number The module can be requested to return the next available unassigned message number To query the next available message number the PC must send the following two byte packet First Byte Second Byte 237 0xed Query next available message number don t care The module will return a number in the range 0 to 255 inclusive A value of zero signifies that there are no free message numbers available Any other value in the range 1 255 can be used as the next message number Example If the following messages have been recorded with message numbers as shown below Message No 1 Message No 3 Message No 4 The query next a
10. its of the ISD total storage capacity e g one long message or hundreds of short messages which fill the device to capacity The user has the ability to remotely control the playback volume and also has control over an external amplifier if required via the PWR and AUX pins For battery powered applications the module can be put into a sleep mode to conserve power 2002 J E E Quadravox Inc Preliminary 3 _ _ _ 0 QV381m0 command set Command Description 234 Oxea Query module identification 235 Oxeb Query current volume level 236 Oxec Query current sampling rate 237 Oxed Query next available message number 238 Oxee Query number of clusters available 239 Oxef Query duration of recorded message 240 Oxf0 Play to speaker 241 Oxf1 Play to auxiliary output 244 0xf4 Record from microphone 247 Oxf7 Toggle AUX pin 249 Oxf9 Set sampling rate 250 Oxfa Sleep mode 251 0xfb Erase message 252 Oxfc Set volume Oxfd Format device 30 0xe6 Stop playback or record Error Response Codes 220 Oxdc Invalid number 221 Oxdd Message number does not exist 222 Oxde Message number to record already exists 223 0xdf No free message numbers 224 0xe0 ISD device is full no free clusters 254 Oxfe OK Confirmation 246 Oxf6 Toggle PWR pin 245 Oxf5 Record from auxiliary input
11. mercial operating temperature range Odeg C to 70degC Voltage on Vdd with respect to Vss 0 3V to 7 5V Total power dissipation 1W Maximum current out of Vss pin 300mA Maximum current out into Vdd pin 250mA Input clamp current lik Vi lt 0 or Vo gt Vdd 20mA Output clamp current lok Vo lt 0 or Vo gt Vdd 20mA Maximum current sunk by any I O pin 25mA Maximum current sourced by any I O pin 25mA Supply voltage max 0 to 5 5V Supply current 1 6 mA typical 4mA Max ISD 5008 ChipCorder Stresses above these limits may cause permanent damage to the ISD5008 device Commercial operating temperature range Odeg C to 70degC Supply voltage Vcc 2 7V to 3 3V Ground voltage Vss OV Voltage applied to any pin Vss 0 3V to Vcc 0 3V 2002 J E E Quadravox Inc Preliminary 20 V300 General QV381M0 module data Maximum number of messages 255 Minimum message duration 8 0 kHz sampling rate 400ms 6 4 kHz sampling rate 500ms 5 3 kHz sampling rate 600ms 4 0 kHz sampling rate 800ms 2002 J E E Quadravox Inc Preliminary 21
12. ng Duration Rate kHz minutes The table above shows the range of possible sampling rates The choice of sampling rate will depend on the desired quality of recording and playback and also the required recording duration e g a higher sampling rate will produce a more faithful reproduction of the original sound but will reduce the available recording time accordingly To alter the sampling rate the following two bytes must be sent to the module First Byte Second Byte 249 0xf9 n Where n 0 8 0 kHz 1 6 4 kHz 2 5 3 kHz 3 4 0 kHz Once the module has received the packet it will send either the code 254 Oxfe OK back to the PC acknowledging the change of sampling rate or the code 220 0xdc Invalid Number signifying the value of the requested sampling rate is out of range If the requested sampling rate is out of range it will remain at its previous value The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 6 10 Recording a message The module can record from either a microphone or via its auxiliary audio input The source of the record is selected by sending the appropriate first command byte The recording function has the form First Byte Second Byte 244 0xf4 record from microphone n or 245 0xf5 record from auxiliary audio in Where nis the message number which refers to a particular message Valid message numbers are 1
13. nsure that internal power on reset functions correctly Power supply 5V nominal 5 5V Max 2002 J E E Q uadravox Inc Preliminary 9 aS A Et Note 6 This pin is capacitively coupled to the ISD5008 Auxiliary input via 100nF capacitor This input has a nominal level of 250mVp p Note 7 This pin is capacitively coupled to the ISD5008 Auxiliary output pin via 10uF capacitor It is capable of driving a minimum load of 5Kohm up to a maximum of 1Vp p Note 8 These pins are driven directly from the PIC 16F876 microcontroller Note 9 The microcontroller can be reset externally by pulling this pin to OV for pulse width duration Low of 2us min This pin is pulled up to 5V via a 10Kohm resistor onboard The microcontroller is ready after 72mS 1024Tosc where Tosc 250nS when power is first applied to the module Note 10 These pins allow direct connection to an 80hm loudspeaker The speaker output is differential and provides a maximum power of 23 5mW RMS The pins are biased to 1 2VDC If a single ended configuration is chosen the pin must be capacitively coupled to the load The unused pin should be left unconnected Stresses above the maximum level must not be exceeded please refer to the specific data sheets for the PIC16F876 04SP and ISD5008P devices for more detailed information Electrical Characteristics PIC16F876 microcontroller Stresses above these limits may cause permanent damage to the PIC16F876 microcontroller Com
14. o in line level analogue input for recording See Note 6 10 ANAOUT Audio out put line level to external amplifier See note 7 11 GND System ground 12 PWR Active low controllable otput See Note 8 low 13 AUX Active high controllable output See Note 8 high 14 RESET Active low input resets the module See Note 9 low 15 SP Direct connection to 8ohm speaker See Note 10 16 SP Direct connection to 8ohm speaker See Note 10 Note 1 The module communicates via RS232 serial interface at 9600 Baud no parity 1 stop bit RXD and TXD control lines are 5V level The module can be directly plugged into the QV430P programming interface which incorporates a MAX232 line driver to interface directly to a personal computer Note 2 The active low BUSY output indicates the module is busy performing another task When active the module will not respond to command requests from the serial interface Note 3 The MIC and MIC pins allow the direct connection to an electret microphone Typically 2 to 20mVp p Input impedance of ISD5008 MIC pins typically 10Kohm On board coupling capacitors 100nF Note 4 RECLED is an active low output from the module It is connected directly to the PIC16F876 microcontroller A suitable LED may be connected via a current limiting resistor to 5V to provide an indication of module activity Note 5 The power supply must rise rate must be gt 0 05 V ms to e
15. tion of 8 minutes 4 0 kHz sampling rate At 4 0 kHz sampling rate each cluster can record 800ms of audio If all 600 clusters are used then the message will be 600 x 800ms 480s 8 minutes in duration As the sampling rate is changed so is the amount of audio record time per cluster as shown above If the number of available clusters are known along with the sampling rate the remaining time available to record any new messages can be determined The module can be requested to return the number of available clusters by sending the following two byte packet First Byte Second Byte 238 Oxee number of free clusters available don t care The module will respond to the request by sending two bytes back to the PC The bytes together contain the number of clusters as a 16 bit number The module returns the low byte first followed by the high byte The high and low bytes can be combined to form a single 16 bit number as shown below number of free clusters hi byte x 256 low byte The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 17 nee E Query the duration of a recorded message The module can return the duration of a message previously recorded To query the duration of message The PC must send the following two byte packet First Byte Second Byte 239 Oxef Query duration of recorded message n Where n is the message number 1 255 inclusive The module
16. up and be ready to respond to serial commands 2002 J E E Quadravox Inc Preliminary 12 a Query module identification The Identity of the module can be verified by sending the following two byte packet First Byte Second Byte 234 Oxea Query identity don t care The module will send two bytes back to the PC in response The first byte returned is the module series number 38 The second byte returned is the software revision number 00 NB The software revision number may vary The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary _ A E Query the current volume level The module can be requested to return the current volume setting without altering its level To query the current volume level the PC must send the following two byte packet First Byte Second Byte 235 0xeb Query volume level don t care The module will return a single byte corresponding to the current volume attenuation level The byte will have a value that lies in the range 0 to 7 decimal The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 14 _ 10 Query the current sampling rate The module can be requested to return the current sampling rate without altering its value To query the current sampling rate setting the PC must send the following two byte packet First Byte S
17. vailable message number command would return 2 signifying that message number 2 is the next free number If a new message is then recorded and given the number 2 as shown below Message No 2 and the query next available message number command is executed the module would return 5 as the next free message number that can be used etc The module will always return the next lowest free message number available N B If there are no free message numbers available it is not possible to record any more messages even if there are free clusters available within the ISD device The Busy and LED lines will go low for the duration of this command 2002 J E E Quadravox Inc Preliminary 16 a 10 Query the number of clusters available The module records sound in small segments known as clusters Each cluster segment can hold a fixed duration of audio information The duration depends on the sampling rate setting 8 0 kHz sampling A single cluster can record 400ms of audio 6 4 kHz sampling A single cluster can record 500ms of audio 5 3 kHz sampling A single cluster can record 600ms of audio 4 0 kHz sampling A single cluster can record 800ms of audio The lower the sampling rate the longer the amount of recording time per cluster but at the expense of reduction in the quality of the recorded sound There are 600 clusters available to record audio The ISD device can record a message with a maximum dura
Download Pdf Manuals
Related Search