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1. The high pass filter limits the frequency band pre the harmonics generator The control range depends on the multiplier switch 6 With the multiplier the sweep range covers the entire audio band from 20 Hz to 20 kHz Together with the low pass filter band pass filtering is possible High pass Filter Multiplier this switch multiplies the frequency range of the high pass filter control by 10 from 20 Hz 2 Hz to 200 Hz 20 kHz m is the most effective way to add interesting colors to a mix You can focus the harmonics on the band that offers the best effects without the need to consider if other frequencies cause negative effects Generator Level and Drive Control The harmonics generator is an almost ideal 4 quadrant multiplier that squares the input signal precisely Squaring results in doubling the frequency which results in clean octaves and not in a mix of different harmonics however squaring also squares the voltage If the input voltage of the generator is 1 V the output voltage is 1 V2 so the output voltage is still 1 V When the level is down by 10 dB 0 316 V the output voltage is 0 316 V2 0 1 Volts Raising the voltage by 10 dB to 3 16 V on the other hand changes the output voltage to 3 16 V2 10 Volts It easy to see that any input level difference results in a difference in the generated harmonics of twice the dB value Since using the filters can result in entirely different leve2. At the center position no harmonics are added The range to the right adds distortion in phase the range to left adds phase reversed distortion Both methods result in different effects with almost all audio signals The scaling of this control gives you an idea about the percentage of harmonics you add however the percentage of distortion depends on the level so the scaling is actually only relevant if the LED indicator 7 is orange 10 to 16 k3 Harmonics Generator and Filter This section generates and adds 3rd harmonics The high pass 10 11 and low pass 12 13 filter control the frequency band that is fed to the generator The drive control 14 shifts the level at the input and output of the harmonics generator into an appropriate range The ADD k3 control 16 allows to add the generated harmonics in phase to the right or phase reversed to the left At the center position of this control no harmonics are added N m m OJ m Low pass Filter Control The low pass filter limits the frequency band pre the harmonics generator The control range depends on the multiplier switch 4 With the multiplier the sweep range covers the entire audio band from 40 Hz to 20 kHz Together with the high pass filter band pass filtering is possible Low pass Filter Multiplier this switch multiplies the frequency range of the low pass filter control by 0 1 from 20 kHz 400 Hz to 2 kHz 40 Hz High pass Filter Control
3. analoge digitale Tonstudiotechnik Karl J ngling Inh Dipl Ing Gerd J ngling dt audio adt audio je PDF Version User Manual Harmonics Distortion Generator with Bandpass Filters U794 V700 Mastering Modules Harmonics Distortion Generator Home V700 Mastering Home The Harmonics Distortion Generator U794 is available in different versions Custom control ranges for several controls are possible as well as different versions of the faceplate and the control knobs The modules are available with electronically or transformer balanced outputs The inputs are always transformer balanced For a general information on the module please change over to the Harmonics Distortion Generator Homepage General Distortion k2 Over more than 50 years This control adds 2nd harmonics to the signal of recording we all got which means that components 1 octave above used to the typical side the original are added The section operates effects of audio recording frequency independent but the percentage of Distortion mainly 2nd and harmonics depends on the input level The SE le 5 Pees relation is not exactly linear With higher levels Sean A oe the increase of distortion is a little lower analog storage methods on e raising the level by 6 dB increases the disc and tape 0 J harmonics by approx 2 dB The control range k2 E 1 oh and law is well adapted and can add small When these effects are not GENERAL Y amounts of harmonics tha
4. erators to keep the input level in a constant range However this would also result in an entirely different behavior of the generators Every time the level drops the regulator would drive up the level again so the distortion would not drop down with the level but remain constant or at least high also with low input levels Of course there is no rule to determine a threshold level for the regulation in general since the filtering makes necessary that also very low levels that result from filtering of small bands can be processed The only way out is to use the drive control in combination with the level indicator Affects the General Distortion settings the k2 and k3 generators Yes the output of the general distortion section drives both the k2 generator and the k3 generator Affects the k2 setting the k3 generator No only the general distortion section affects the generators The k2 and the k3 section is driven from the output of the general distortion section The outputs are added directly to the output driver amplifier I ve been using the drive control to shift the level up till the LED was red The harmonics are different but sound very nice What happens with this setting When the LED indicator color becomes red the input level will exceed the linear operation range of the particular generator With red color you simply clip the generator It will not output clean k2 or k3 anymore but a mix of different harmonics The comb
5. es clipping of the generator ADD k2 this control adds the output signal of the harmonics generator to the original signal At the center position no harmonics are added The range to the right adds distortion in phase the range to left adds phase reversed distortion Both methods result in different effects with almost all audio signals The scaling of this control gives you an idea about the percentage of harmonics you add however the percentage of distortion depends on the level so the scaling is actually only relevant if the LED indicator 7 is orange ON Switch This switch inserts the module Unless the ON quints above the octave and not in a mix of different harmonics however cubing also cubes the voltage If the input voltage of the generator is 1 V the output voltage is 1 V3 so the output voltage is still 1 V When the level is down by 10 dB 0 316 V the output voltage is 0 316 V3 0 0316 Volts Raising the voltage by 10 dB to 3 16 V on the other hand changes the output voltage to 3 16 V3 31 6 Volts which means that the generator clips It is easy to see that any input level difference results in a difference in the generated harmonics of three times the dB value Since using the filters can result in entirely different levels at the output of the filter section it is necessary to adjust the drive control that can shift the input level of the generator into an appropriate range for propper operat
6. ination of the harmonics is different from the effect that occurs when clipping a normal amplifier In addition both generators react differently There is no reason why you shouldn t use this range if the result is of advantage It s not the intended use but you will not damage anything or get any disadvantage from using that range The general k3 control is very intested however it would be a perfect thing if there are some more controls to modify the behaviour Is this possible Yes and no The network that simulates the pentode is designed in a way that the transition range is very high to allow sensitive regulation and to produce high k3 and low k2 and k4 harmonics If you tell us what you de like we can change this network There is no room for more controls on the faceplate of the U794 anymore so additional pots to modify the behaviour of the network are not possible Please have look at the U784 Colorizer that offers some different distortion effects In addition we are pondering on an additional device that offers one or two networks with a full set of controls for the modification of the behaviour If this module is of interest for some customers we re gonna make it in the near future If you have any questions or comments please let us know TOP
7. ion swtich is pressed the module is hard bypassed by relays Input and output connectors are bridges and the inputs and ouputs of the module are switched away from the connectors The inputs do not load the driving source when bypassed Initial Setting The following setting results in a neutral setting of all stages 1 Insert the unit with the ON switch 17 2 Set the General Distortion k2 control 1 all to the left no distortion will be added 3 Set the General Distortion k3 control 2 all to the left no distortion will be added 4 Set the ADD k2 control 9 to the O position center no distortion will be added 5 Set the ADD k3 control 16 to the 0 position center no distortion will be added 6 Set the Drive Control 8 to the O position center no level shift 7 Set the Drive Control 14 to the 0 position center no level shift 8 Release the Mult switches 4 6 11 13 of the filters 9 Set the low pass filter controls 3 10 all to the right 10 Set the high pass filter controls 5 12 all to the left Quickstart a Using the different functions of the harmonics generator depends on the taste of the engineer and producer and on the structure mix Therefore there is no general procedure for the adjustment b Since the only problems that might come up are too much distortion in the output signal and or too high level on one of the harmonics generators nothing else has tobe considered tha
8. low frequencies only The two effects are better adapted in a way that the reaction is quite similar to a hard driven tube amplifier with In addition the balance transformers and pentodes however this between 2nd and 3rd control is not a tube sound simulator It just harmonics is important for generates the same kind of harmonics the subjetive impression distortion Like the k2 general control this Two much of one or other control adds another interesting color to the Seele ess lo nis Im signal missing something feeling 3 to 9 k2 Harmonics Generator and Filter This section generates and adds 2nd harmonics The high pass 3 4 and low pass 5 6 filter control the frequency band that is fed to the generator The drive control 8 shifts the level at the input and output of the harmonics generator into an appropriate range The ADD k2 control 9 allows to add the generated harmonics in phase to the right or phase reversed to the left At the center position of this control no harmonics are added Low pass Filter Control High pass and low pass The low pass filter limits the frequency band pre filter together form a band the harmonics generator The control range pass filter that allows depends on the multiplier switch 4 With the selection of any frequency multiplier the sweep range covers the entire band in the audio audio band from 40 Hz to 20 kHz Together with e ation from 20 the high pass filter band pass filtering i
9. ls at the output of the filter section it is necessary to adjust the drive control that can shift the input level of the generator into an appropriate range for propper operation High pass and low pass filter together form a band pass filter that allows selection of any frequency band in the audio frequency range from 20 Hz to 20 kHz Generating distortion only in a certain frequency band is the most effective way to add interesting colors to a mix You can focus the harmonics on that band that offers the best effects without the need to consider if other frequencies cause negative effects Generator Level and Drive Control The harmonics generator is an almost ideal 4 quadrant multiplier that cubes the input signal precisely Cubing results in multiplying the frequency O k2 GENERAL 14 15 16 17 Drive Control and Level Indicator The Drive Control determines the operation level of the harmonics generator section Turning the control to the right raises the the input level of the generator and reduces its output level and vice versa The control range is 20 dB The operation level of the generator is cruicial for an clean harmonics signal with sufficient output level The LED indicator displays the level in relation the optimum drive of the generator With green color the level is too low turn the Drive control to the right yellow to orange color displays correct level while red color indicat
10. s No possible Generating distortion only in a certain frequency band MEA NJ SNS oe Low pass Filter Multiplier this switch multiplies the frequency range of the low pass filter control by 0 1 from 20 kHz 400 Hz to 2 kHz 40 Hz High pass Filter Control The high pass filter limits the frequency band pre the harmonics generator The control range depends on the multiplier switch 6 With the multiplier the sweep range covers the entire audio band from 20 Hz to 20 kHz Together with the low pass filter band pass filtering is possible High pass Filter Multiplier this switch multiplies the frequency range of the high pass filter control by 10 from 20 Hz 2 Hz to 200 Hz 20 kHz Drive Control and Level Indicator The Drive Control determines the operation level of the harmonics generator section Turning the control to the right raises the input level of the generator and reduces its output level and vice versa The control range is 20 dB The operation level of the generator is cruicial for a clean harmonics signal with sufficient output level The LED indicator displays the level in relation the optimum drive of the generator With green color the level is too low turn the Drive control to the right yellow to orange color displays correct level while red color indicates clipping of the generator ADD k2 this control adds the output signal of the harmonics generator to the original signal
11. t are mostly used present we usually don t DISTORTION precisely 2nd harmonics are typical for all kinds consider this as advantage 1 of active components triodes transistors FETs In fact we do not CA na and practically everything else that can be use appreciate the absence of for amplifcation Adding k2 causes the same kind the small percentage of of distortion as vintage tube amplifiers with distortion we are used to triodes which is described with terms like warm and musical We also don t like too much of that kind distortion as soon as the distortion reaches a certain point it s getting disturbing General Distortion k3 This control adds 3rd harmonics the quint above the octave to the original The control shifts a soft transition into a clipping curve that is quite similar to the characteristics of a pentode towards lower levels The transition Though digital audio has range begins about 10 dB below the clipping many disadvantages level This part of the effect makes possible to harmonics distortion is not add the coloroisation of a pentode to the signal an issue with digital audio When set all to the right the transition range It s free from those effects starts at O dBu In addition the input Therefore adding a little transformer is treated in a way that it produces Percentage of appropriate distortion results in a mix typical transformer distortion which occurs at net culspactively saumde
12. t is of any importance c Make sure that the drive controls 8 amp 14 are set to a position where the level indicators 7 amp 15 are yellow to orange but not red to make shure that the input level of the generators is okay for propper operation If the level throughout the mix is not constant use a high level passage for the setting TELLO La Options Control Ranges We can adapt the control ranges to your needs Please let us know what you are looking for here Inputs and Outputs The modules is available with electronically balanced and transformer balanced outputs The inputs are always transformer balances since the input transformers are included in the General k3 section sa T N ge audio Appearance The colors of the faceplate the control knobs and switch caps can be determined by the customer Please check for details here TOP FAQ s Why is the distortion level so different when I use the filters extensively The effect of different input levels on the harmonics generator section is explained in detail in the boxes for k2 and k3 Please read the text to learn about the background When using the filters extensively to cut out a small band it depends on the spectrum of the mix how this filter setting affects the output level Usually the level will drop dramatically when the frequency band is very small Any kind of additional regulation would result in some kind of compressor at the input of the gen
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