doepfer System A - 100 1. Introduction A-114
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1. nal audio signal toa VCA This is necessary because the ring modulator doesn t completely shut off when there s OV input The VCO is still just audible at approximately 50 to 60dB even when there s no external audio signal The VCA gates it completely i Experiment with this set up for instance by replacing the sine wave with other wa veforms eg sawtooth square wave etc The waveform you use can itself also be modulated for instance by PWM AM FM or audio signal Dual Ring Modulator A 114 QOOEP FER System A 100 Glissando ring modulation The patch in Fig 3 produces some interesting sounds Input two VCOs set to an exact harmonic interval eg a fifth or octave into the ring modulator Send the pitch CV direct to the first VCO but run the second oscillator s CV through the upper section of the slew limiter A 170 first Whenever the pitch CV changes the ring modulation causes gradual changes in the sound spectrum Gate A 11 X YOUT A 170 VCO 2 Fig 3 Glissando ring modulation i Use the upper part of the A 170 for this because the diode offset in the lower part will put the VCO out of tune A 114 Dual Ring Modulator System A 100 QOOEPFER 5 Patch Sheet The following diagrams of the module can help A 114 A 114 A 114 you recall your own Patches They re designed so RING MOD RING MOD RING MOD that a complete 19 rack of2. A 114 RING MOD XIN YIN a X YOUT X IN YIN a X YOUT System A 100 Dual Ring Modulator A 114 1 Introduction Module A 114 Dual Ring Modulator contains two separate ring modulators A ring modulator outputs the product Multiplication X Y of the signals at inputs X and Y It s similar to a VCA but whereas a VCA only responds to positive voltages at the inputs 2 quadrant multiplication the ring modulator responds to both positive and negative voltages 4 quadrant multiplication The ring modulator thus provides a refinement of amplitude modulation AM Ordinary amplitude modu lation will output the original carrier frequency f as well as the two side bands fe fy fo fm for each of the spectral components of the carrier and modulation signals but ring modulation cancels out the carrier frequencies and just lets the side bands pass to the output see Fig 1 A ring modulator is used for the production of bell like sounds alien voices or just to produce new timbres A 114 Dual Ring Modulator System A 100 QOOEPFER 2 Dual Ring Modulator Overview In Outputs A 114 o RING MOD O Xin Signal input o XN Yin Signal input X Y Out Output Qo YNe Xe Tout RING MOD XIN 3 In Outputs O Xin Yin Sockets and are the signal inputs for the A 114 Patch the signals you would like to ring modulate into t
3. hese sockets The inputs need to have AC signals so you should use audio signals not control voltages For control voltages use a VCA X Y Out Socket is the ring modulator Output System A 100 Dual Ring Modulator A 114 4 User examples Basic ring modulation Fig 1 shows a basic form of ring modulation using two sine waves This patch can provide bell and vibes like sounds A 114 RING MOD f 440 Hz 6 z m XN f y 77 7 Hz Sy F Y IN f otf y 517 7 Hz X Y OUT fe fy 362 3 Hz Fig 1 Ring modulation with two sine waves A 114 Dual Ring Modulator Ring modulation of audio signals A ring modulator is very good at doing weird things to audio signals for instance voices strings sax The example at Fig 2 shows an audio signal input via module A 119 Ext In ring modulated with a sine wave The spectrum at the output contains the sum and difference of the frequency of the sine wave with every single one of the components of the audio signal s sound spectrum Audio Ou m A 119 ext Ern O Audio In Fig 2 Ring modulation of an external audio signal System A 100 DODEPFER In this patch the A 119 performs two functions On the one hand it s bringing the level of the external signal up to the A 100 s operating level round about 5 Vss On the other hand it s also sending the envelope follower output the envelope generated by the exter
4. modules will fit onto an xIN ING XIN A4 sheet of paper YIN YN YIN Photocopy this page and cut out the pictures of this and your other modules You can then stick PIAAC nre Xve them onto another piece of paper and create a diagram of your own system n u Make multiple copies of your composite diagram XIN XIN XIN and use them for remembering good patches and A d l set ups YN YN Y IN our our our e Draw in patchleads with colored pens
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