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Csound Plugins

diode_ringmod

diode_ringmod

Abstract

A ring modulator with optional non-linearities

Description

diode_ringmod is a ring modulator with optional non-linearities. It implements a built-in sinusoidal carrier signal. The carrier is passed through a diode simulation prior to being multiplied with the input. This signal passes through a feedback stage.

Sinewave : Diode Rect (abs(x)*2-0.2) : _ * Input : Feedback

knonlinearities controls the amount of jitter in the carrier's freq and feedback amount. diode_ringmod is a port of Loser's ringmodulator jsfx plugin distributed with REAPER

Syntax

aout diode_ringmod ain, kfreq, kdiode=0, kfeedback=0, knonlinear=0, koversample=0

Arguments

ain: the input signal
kfreq: the carrier's frequency (a sine wave)
kdiode: if 1, the carrier is passed through a diode rectification stage
kfeedback: the amount of feedback (between 0 and 1, 0=no feedback)
knonlinear: the amount of non linearities (between 0 and 1, 0=no non linearities)
koversample: if 1, oversampling x 2 is performed

Output

aout: audio output of the ring modulator

Execution Time

Performance (audio)

Examples

<CsoundSynthesizer>

<CsInstruments>

/*

    This is the example file for diode_ringmod

    To be run inside CsoundQt

    NB: diode_ringmod is a port of the jsfx plugin
    Loser/ringmodulator, which implements diode rectification
    and non linear behavior in the feedback path. 

    aout diode_ringmode a1, kmodfreq, kdiode=1, kfeedback=0, knonlin=0.2, koversample=0

    kmodfreq: frequency of the mod. signal
    kdiode: if 1, a diode rectification stage is applied to the mod. signal
    kfeedback: range is 0 to 1.
    knonlin: range 0 to 1, implements non-linearities in feedback and mod. freq (for 
        the first case only, which used the builtin oscillator)
    koversample: if 1, 2x oversampling is used.

*/

sr     = 44100
ksmps  = 64
nchnls = 2
0dbfs  = 1

chn_k "modmidi", "r"
chn_k "feedback", "r"
chn_k "nonlinear", "r"
chn_k "oversample", "r"
chn_k "diode", "r"

gaOuts[] init 2


massign 1, 1
instr 1
  imidinote notnum
  ivel1 ampmidi 127
  ifreq mtof imidinote
  idb bpf ivel1, 0, -120, 64, -20, 90, -12, 127, 0
  iamp = ampdb(idb) * 0.2
  asig vco2 iamp, ifreq
  ; asig oscili iamp, ifreq
  aenv adsr 0.01, 0.1, 0.8, 0.2
  asig *= aenv
  gaOuts[0] = gaOuts[0] + asig

endin

instr 100
  kmodmidi = int(chnget:k("modmidi") * 4)/4
  if changed(kmodmidi) == 1 then
    outvalue "note", mton(kmodmidi)
  endif
  kdiode chnget "diode"
  kfeedback chnget "feedback"
  knonlinear chnget "nonlinear"
  koversample chnget "oversample"
  kmodfreq = mtof:k(kmodmidi)
  a1 = gaOuts[0]
  a2 diode_ringmod a1, kmodfreq, kdiode, kfeedback, knonlinear, koversample
  outs a2, a2
  gaOuts[0] = 0
endin

</CsInstruments>

<CsScore>
i 100 0 3600
</CsScore>
</CsoundSynthesizer>


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<bsbPresets>
</bsbPresets>

See also

hilbert

Reference

https://en.wikipedia.org/wiki/Ring_modulation

Credits

Eduardo Moguillansky, 2019