Residual

extracts stochastic components (transients etc) from a sound (using csound 5 opcodes)

Description

Residual takes in a signal, analyses it in terms of stable partials and then subtracts the stochastic, noise-based, components of the sound, which form the output of the opcode. This UDO uses new opcodes found in csound 5 only.

Syntax

asig Residual ain, ifftsize

Initialization

ifftsize - length of the FFT analysis in samples

Performance

asig - residual output
ain - signal input

Code

opcode Residual, a, ai

ain,isiz  xin 
ihsiz = isiz/4
ffr,fphs  pvsifd   ain, isiz, ihsiz, 1
ftrk      partials ffr, fphs, 0, 1, 3, 500
aout      sinsyn   ftrk, 2, 500, 1
asd       delayr   isiz/sr
asig      deltapn  isiz-ihsiz
          delayw   ain
          xout     asig-aout

endop

Examples

instr 1

ain  inch 1
ares Residual ain, 2048
     out  ares
endin

Credits

Victor Lazzarini, 2005