Ring Modulation Oscillator
Contents
1. ARI E Ring Modulation Oscillator Analog Effect Device RON ROY Mia s W s ROKR RAK MOC tttter we YY we XY r CEE EE EEEE SEES XAXA AIIAN AAAA OG Berlin 2015 The XRI E is an analog ring modulator device with internal oscillator suitable for instrument or microphone input The oscillator frequency is adjustable by manual control coarse and fine over a wide range In addition it can be modulated by an internal LFO low frequency oscillator and or an envelope follower If applied an external CV control voltage or pedal may be also used for frequency modulation Original and effect signal are miscible but the XRI E also provides a footswitch input for external switching between effect and original In this case the XR1 E provides true bypass routing Further the ability of battery operation makes the device independent from external power supply 6x AA mignon cells The XR1 E is based on a function generator chip which warm and smooth sound makes it excellently suitable for electronic music and ring modulation Low noise preamp Ring modulation oscillator frequency range e High 8Hz 18000 Hz Low 0 15Hz 60Hz Envelope follower and LFO for frequency modulation Frequency CV input 1V oct adjustable also suitable for pedal use Optional footswitch control true bypass Battery operation or external DC power supply wide voltage range 6 15V Power dissipation ca 6 00mW operation time with2. Modulation N Cy Waveform i Inversion Envelope ext 4 my 5 Fine Adj 0 LFO Frequency o LFO Mode 0 l Preamp Carrier Surpression Bypass anaana O Instrument Footswitch Q HMM TN In Oufputs and Control Elements On Off Switch Switches the power supply on or off Note In combination with an external power adaptor only the XR1 E will be switched off and not the power adaptor itself This means that the power adaptor still may consume some current for its own stand by It is recommended to disconnect the adaptor completly from public power supply if the XR1 E is not in use for a of longer time External Power Supply Input Allows the operation with an external standard DC power adaptor The connection is a standard DC plug with 2 1mm diameter hole By using the external power supply input the internal batteries will be switched off The input voltage range is 6V 15V Max current dissipation is ca 100mA at 9V 70mA Take care on right polarity The pole is the outer contact Output Connection to the following stage e g an amplifier Only previous version Rev1 Output Attenuator Switch High max 8Vpp output voltage made for analog synthesizer inputs line in mixer inputs etc Low max 0 8Vpp output voltage for instrumental amplifier inputs etc This switch only exists in the XR1 E s previous ver
3. frequency Ne sui built vT Complexe sound structures are generated depending on the oscillator frequency Support Christian Gunther Forster Str 50 10999 Berlin cg mandalamat de Phone 49 30 61286299 Mobile 49 178 7699267 www cg products de This documentation is for XR1 E Rev 2 For the previous version with output high low switch and without true bypass see here www cq products de XR1 E_documentation_Rev1 pdf Christian G nther 2015
4. zinc carbon cells ca 6 1 0h Quick sfarf guide 1 Insert batteries or accus 6x AA Mignon or connect a power adaptor Set the power switch upwards to On Connect an amplifier mixer etc to the output Connect an instrument or microphone to the instrument input 2 Set the frequency selector switch 9 on Hi Turn the Frequency knob in middle position Turn the bypass pot in fully right position 100 Turn the envelope and LFO modulation knobs in fully left position 0 By calibrating the Carrier Surpression pot while listening to the oscillator tone adjust the tone to its minimum 0 on the scale denter locked you may also use the green LED for indication Adjust the Preamp input gain controller while playing your instrument and listen for optimal performance NOTE t is not possible to eleminate the carrier oscillator tone completely There will always remain some overtone frequencies Try to set the input pot ona high level but without distortion to achieve best operation 3 With this basic settings it is easy to experiment further on e g with different oscillator frequencies 9 by adding some frequency modulation with the LFO for LFO speed and 5 for modulation depth or by activating the envelope modulation by turning knob ClOCKWISe etc G O O D Output Low Frequency DC in On XRI E PLOR CV in 6 15V off OON a C DMN TAATAAN o N
5. an external control voltage CV or an external resistor By connecting a jack to this input the internal envelope follower will be shut off and instead the fed in control voltage will modulate the oscillator s frequency the modulation depth can be adjusted by knob The modulation CV s polarity can be inverted by switch 8 Normally a higher voltage will cause a higher pitch and vice versa With 43 in lower postion Inversion a higher voltage will cause a decreasing pitch and vice versa Further a 5V DC voltage via 10kQ resistor is provided on 9 available on the middle connector of a 3pole jack plugged in 9 Thus may be useful for example in combination with a sensor or a pedal In the latter case a common passive foot pedal with 3pole jack should work 5V 10k Poti 100k YE frequency control in lt from envelope follower e g foot pedal i 19 Frequency CV in In combination with analog synthesizer equipment e g sequencers monophone keyboards it is possible to calibrate the XR1I E on 1V Oct by adjusting knob To calibrate on 1V Oct for tracking with other instruments connect the external CV source to 9 and set the pointer of the Envelope ext Modulation controller to nearby 7 on the scale This is a good base Then adjust by listening with different CV values until the pitch matches with the pitch of your instrument Envelope ext Modulation About Ring Modulation Ring modulation is the mul
6. lation of the ring modulation oscillator Frequency is from 0 06Hz left position to 44Hz right position The LFO frequency is also displayed by the orange LED for visual control 5 LFO Modulation Depth Control Amount of LFO modulation depth LFO Waveform Switch The LFO waveform can be selected between triangle av and square rm a will provide a continously up and down gliding pitch while m makes the oscillator shifting between two tones 4D Envelope Follower ext CV Modulation Depth Control The internal envelope follower converts the volume of the input signal on the instrument input into a control voltage modulating the oscillator frequency Amount of modulation can be varied by this knob If the external frequency CV Control Voltage input is used the internal envelope follower will be switched off instead the signal on C9 can be adjusted by this pot frequency modulation depth Envelope Follower Modulation Inversion Switch Switches the modulation polarity from envelope follower or an external source on 9 from positive to negative If the switch is in upper position the pitch of the AM oscillator will increase with higher volume of the input signal switch in lower position Inversion the pitch will decrease with higher input volume The inversion switch works also for a control voltage signal connected to External Frequency Control Input Allows to control the oscillator pitch by
7. nal bypass dry wet control e g by a footswitch e Switch closed The dry original input signal true bypass e Switch opened The effect signal also depending on postion of the Bypass control knob The switching also can be controlled by an external logic signal OV effect 5V dry e g a gate signal from a synthesizer Oscillator Frequency High Low Switch Hi 8Hz 18000 Hz Audio range Lo 0 15Hz 60 Hz In Hi position the oscillator is mainly working in audio range The amplitude modulation will generate additional audio frequencies sum and difference tones of the input signal and the oscillator frequency In Lo position the oscillator is working with subaudio frequencies The amplitude modulation result is a tremolo like sound Volume of the input signal will change constantly with the oscillator frequency Oscillator Frequency Control Coarse adjustment of the amplitude modulation AM oscillator frequency 2 Oscillator Frequency Fine Adjustment Control Fine tuning of the oscillation frequency Range is about 4 5 semitones quarte 3 Oscillator Waveform Switch The oscillator waveform can be selected between sinewave and triangle In A sine position the effect is a more smooth sound with less overtones in AV triangle mode the generated sounds are rougher and with more overtones LFO Frequency Control Speed control of the internal LFO low frequency oscillator for frequency modu
8. sion Revl Due to the new true bypass feature in the actual version Rev2 this switch is no longer useful Instrument Input Input jack for instrument or microphone Impedance ca 380kQ max input voltage lt 3 5Vpp Preamp Gain Control Adjustment of the the input preamp s amplification for the instrument input The preamp is feeding the oscillator s amplitude modulation input It is necessary to adjust the preamplification properly for best performancy The input signal should be not distorted but also not too soft for the best effect to noise ratio Carrier Surpression Control Controller for calibrating the oscillator carrier tone to its minimum The 0 position in the middle of the scale the potentiometer s denter locked may be used as reference point as well as the green LED when dark and without input signal is suitable for indication of a minimum carrier tone amount Note There will always remain a little bit of the oscillator sound 2 harmonics etc For best performance make sure that the input signal level is high Bypass Control Ratio between input signal preamplified and effect signal Turning the knob fully left will provide the preamplified input signal only by turning the knob clockwise the effect signal will increase more and more and the original dry signal will disappear Fully right position 100 the pure ring modulation effect signal Footswitch Input Input jack for exter
9. tiplication of two bipolar audio signals by each other Each value of a carrier signal C is multiplied by a modulator signal M to create a new ring modulated signal R R t C t X M from http en wikibooks org wiki Sound_Synthesis_ Theory Modulation_Synthesis It is referred to as ring modulation because the analog circuit of diodes originally used to implement this technique took the shape of a ring Wikipedia For example If one or both of the input signals C or M is OV the output R will be also OV Note In the case of the XR1 E the carrier signal is N or N provided by the internal oscillator Examples Input modulator signal frequency gt gt oscillator carrier frequency 32100ms 3200ms 32300ms 32400ms 32500mz l 32600ms 32700m l 32800ms 32300ms 10s 102100ms 102200ms NIN REATO TEE TTE an an l ed cD me amb amd and anad aad ennd amad ad ad el cd ad S amal a an anh ad cl cil cc al Se ad cl i ai aad aah a ad ad aed ah ce cl aad aad aad i aad i cel cl il i al aad aad li eel cl aS cl cl ad i ed i aad el aad el ci ame aad 37 5 235 37 5 50 Input signal metallophone The volume of the metallophone sound varies with the oscillator amplitude 100 4 Input signal Base drum from rhythm machine The generated effect signal The volume of the oscillator sound varies with the amplitude of the input signal Input modulator signal frequency lt or oscillator carrier
Download Pdf Manuals
Related Search