ceps
Calculate the cepstrum of an array input, optionally filtering coefficients.
Syntax
keps[] ceps kmags[] [, icoefs]
Initialization
icoefs -- the number of retained coefficients in the cepstrum output. By default, no coefficients are filtered.
keps[] -- the cepstrum output, an array of size N+1, where N is a power of two.
kmags[] -- an input array containing N+1 magnitudes.
Examples
Here is an example of the use of the ceps opcode. It uses the file ceps.csd.
| Example of the _ceps_ opcode. |
|---|
| <CsoundSynthesizer>
<CsOptions>
</CsOptions>
<CsInstruments>
instr 1
a1 diskin "fox.wav",1,0,1
k1 randh 80, 2.5
a2 vco2 1, 220+k1
kfsig[] init 1026
fsig pvsanal a1,1024,256,1024,1
fsig2 pvsanal a2,1024,256,1024,1
kf pvs2tab kfsig,fsig
keps[] ceps c2r(kfsig),30
kenv[] cepsinv keps
fenv tab2pvs r2c(kenv)
fvoc pvsfilter fsig2, fenv, 1
asig pvsynth fvoc
out asig
endin
</CsInstruments>
<CsScore>
i1 0 60
</CsScore>
</CsoundSynthesizer>
|
See Also
Array-based spectral opcodes
Credits
Author: Victor Lazzarini
2014