trmix

Streaming partial track mixing.

The trmix opcode takes two inputs containg TRACKS pv streaming signals (as generated, for instance by partials) and mixes them into a single TRACKS stream. Tracks will be mixed up to the available space (defined by the original number of FFT bins in the analysed signals). If the sum of the input tracks exceeds this space, the higher-ordered tracks in the second input will be pruned.

Syntax

fsig trmix fin1, fin2

Performance

fsig -- output pv stream in TRACKS format

fin1 -- first input pv stream in TRACKS format.

fin2 -- second input pv stream in TRACKS format

Examples

Here is an example of the trmix opcode. It uses the file trmix.csd.

<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 trmix.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

instr 1

ain     diskin2 "fox.wav", 1
fs1,fsi2 pvsifd ain, 2048, 512, 1               ; ifd analysis
fst     partials fs1, fsi2, .003, 1, 3, 500     ; partial tracking
fslo,fshi trsplit fst, 1000                     ; split partial tracks at 1000 Hz
fscl    trscale fshi, 1.3                       ; shift the upper tracks
fmix    trmix   fslo,fscl                       ; mix the shifted and unshifted tracks
aout    tradsyn fmix, 1, 1, 500, 1              ; resynthesis of tracks
        outs    aout, aout

endin
</CsInstruments>
<CsScore>
f1 0 8192 10 1  ;sine wave

i 1 0 3
e
</CsScore>
</CsoundSynthesizer>

The example above shows partial tracking of an ifd-analysis signal, frequency splitting and pitch shifting of the upper part of the spectrum, followed by the remix of the two parts of the spectrum and resynthesis.

See also

Tools for Real-time Spectral Processing (pvs opcodes)

Credits

Author: Victor Lazzarini
February 2006

New in Csound 5.01