binit
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## binit

binit — PVS tracks to amplitude+frequency conversion.

## Description

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

Example 60. 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
    fbins binit  fst, 2048 ; convert it back to bins
          aout pvsynth fbins ; overlap-add resynthesis
    out aout

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

## Credits

Author: Victor Lazzarini;
February 2006

New in Csound5.01

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