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binit

PVS tracks to amplitude+frequency conversion.

The binit opcode takes an input containg a TRACKS pv streaming signal (as generated, for instance by partials) and converts it into a equal-bandwidth bin-frame containing amplitude and frequency pairs (PVS_AMP_FREQ), suitable for overlap-add resynthesis (such as performed by pvsynth) or further PVS streaming phase vocoder signal transformations. For each frequency bin, it will look for a suitable track signal to fill it; if not found, the bin will be empty (0 amplitude). If more than one track fits a certain bin, the one with highest amplitude will be chosen. This means that not all of the input signal is actually 'binned', the operation is lossy. However, in many situations this loss is not perceptually relevant.

Syntax

fsig binit fin, isize

Performance

fsig -- output pv stream in PVS_AMP_FREQ format

fin -- input pv stream in TRACKS format

isize -- FFT size of output (N).

Examples

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

Example of the binit opcode.
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<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac     ;;;RT audio out
;-iadc    ;;;uncomment -iadc if RT audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o binit.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2

instr 1
;ain inch 1                             ; for live input
ain     diskin   "drumsMlp.wav", 1              ; input signal
fs1,fsi2 pvsifd  ain, 2048, 512, 1              ; ifd analysis
fst     partials fs1, fsi2, .003, 1, 3, 500     ; partial tracking
fbins   binit    fst, 2048              ; convert it back to bins
aout    pvsynth  fbins                  ; overlap-add resynthesis
        outs     aout, aout

endin

</CsInstruments>
<CsScore>

i 1 0 2
e


</CsScore>
</CsoundSynthesizer>

The example above shows partial tracking of an ifd-analysis signal, conversion to bin frames and overlap-add resynthesis.

See also

Tools for Real-time Spectral Processing (pvs opcodes)

Credits

Author: Victor Lazzarini
February 2006

New in Csound5.01