trscale — Streaming partial track frequency scaling.


The trscale opcode takes an input containg a TRACKS pv streaming signal (as generated, for instance by partials) and scales all frequencies by a k-rate amount. It can also, optionally, scale the gain of the signal by a k-rate amount (default 1). The result is pitch shifting of the input tracks.


fsig trscale fin, kpitch[, kgain]


fsig -- output pv stream in TRACKS format

fin -- input pv stream in TRACKS format

kpitch -- frequency scaling

kgain -- amplitude scaling (default 1)


Example 471. Example

ain inch 1                  ; input signal
fs1,fsi2 pvsifd ain,2048,512,1 ; ifd analysis
fst  partials fs1,fsi2,.003,1,3,500  ; partial tracking
fscl trscale  fst, 1.5 ; frequency scale (up a 5th)
      aout  tradsyn fscl, 1, 1, 500, 1 ; resynthesis 
out aout

The example above shows partial tracking of an ifd-analysis signal and linear additive resynthesis with pitch shifting.


Author: Victor Lazzarini;
February 2006

New in Csound5.01