trshift — Streaming partial track frequency scaling.
The trshift opcode takes an input containg a TRACKS pv streaming signal (as generated, for instance by partials) and shifts all frequencies by a k-rate frequency. It can also, optionally, scale the gain of the signal by a k-rate amount (default 1). The result is frequency shifting of the input tracks.
fsig -- output pv stream in TRACKS format
fin -- input pv stream in TRACKS format
kshift -- frequency shift in Hz
kgain -- amplitude scaling (default 1)
Here is an example of the trshift opcode. It uses the file trshift.csd.
Example 1119. Example of the trshift opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o trshift.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 kpsft = p4 ain diskin2 "fox.wav", 1 fs1, fsi2 pvsifd ain, 2048, 512, 1 ; ifd analysis fst partials fs1, fsi2, 0.003, 1, 3, 500 ; partial tracking fscl trshift fst, kpsft ; frequency shift aout tradsyn fscl, 1, 1, 500, 1 ; resynthesis outs aout, aout endin </CsInstruments> <CsScore> f1 0 8192 10 1 ;sine i 1 0 3 150 ;adds 150Hz to all tracks i 1 + 3 500 ;adds 500Hz to all tracks e </CsScore> </CsoundSynthesizer>
The example above shows partial tracking of an ifd-analysis signal and linear additive resynthesis with frequency shifting.