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Signal Generators: FM Synthesis

fmbell, fmrhode, fmwurlie, fmmetal, fmb3, fmpercfl

  ar      fmbell     kamp, kfreq, kc1, kc2, kvdepth, kvrate, ifn1, ifn2, ifn3, ifn4, ivfn
  ar      fmrhode    kamp, kfreq, kc1, kc2, kvdepth, kvrate, ifn1, ifn2, ifn3, ifn4, ivfn
  ar      fmwurlie   kamp, kfreq, kc1, kc2, kvdepth, kvrate, ifn1, ifn2, ifn3, ifn4, ivfn
  ar      fmmetal    kamp, kfreq, kc1, kc2, kvdepth, kvrate, ifn1, ifn2, ifn3, ifn4, ivfn
  ar      fmb3       kamp, kfreq, kc1, kc2, kvdepth, kvrate, ifn1, ifn2, ifn3, ifn4, ivfn
  ar      fmpercfl   kamp, kfreq, kc1, kc2, kvdepth, kvrate, ifn1, ifn2, ifn3, ifn4, ivfn

Description

A family of FM sounds, all using 4 basic oscillators and various architectures, as used in the TX81Z synthesizer.

Initialization

All these opcodes take 5 tables for initialization. The first 4 are the basic inputs and the last is the low frequency oscillator (LFO) used for vibrato. The last table should usually be a sine wave.

For the other opcodes the initial waves should be as in the table:

              ifn1        ifn2          ifn3      ifn4

fmbell sinewave sinewave sinewave sinewave fmrhode sinewave sinewave sinewave fwavblnk fmwurlie sinewave sinewave sinewave fwavblnk fmmetal sinewave twopeaks twopeaks sinewave fmb3 sinewave sinewave sinewave sinewave fmpercfl sinewave sinewave sinewave sinewave

The sounds produced are then:


fmbell        Tubular Bell 
fmrhode       Fender Rhodes  Electric Piano 
fmwurlie      Wurlitzer Electric Piano 
fmmetal       "Heavy Metal" 
fmb3          Hammond B3 organ 
fmpercfl      Percussive Flute

Performance

kamp – Amplitude of note.

kfreq – Frequency of note played.

kc1, kc2 -- Controls for the synthesizer, as in the table:

kc1           kc2                                           Algorithm

fmbell Mod index 1 Crossfade of two outputs 5 fmrhode Mod index 1 Crossfade of two outputs 5 fmwurlie Mod index 1 Crossfade of two outputs 5 fmmetal Total mod index Crossfade of two modulators 3 fmb3 Total mod index Crossfade of two modulators 4 fmpercfl Total mod index Crossfade of two modulators 4

kvdepth -- Vibrator depth

kvrate -- Vibrator rate

Author

John ffitch (after Perry Cook)
University of Bath, Codemist Ltd.
Bath, UK
New in Csound version 3.47


Use Non-Frames Version Previous Page Next Page
Signal Generators: FM Synthesis