pvsynth
Prev | Orchestra Opcodes and Operators | Next

## pvsynth

pvsynth — Resynthesise using a FFT overlap-add.

## Description

Resynthesise phase vocoder data (f-signal) using a FFT overlap-add.

## Syntax

    ares pvsynth fsrc, [iinit]

## Performance

ares -- output audio signal

fsrc -- input signal

iinit -- not yet implemented.

## Examples

Example 679. Example (using score-supplied f-table, assuming fsig fftsize = 1024)

    ; score f-table using cubic spline to define shaped peaks
    f1 0 513 8 0 2 1 3 0 4 1 6 0 10 1 12 0 16 1 32 0 1 0 436 0

    asig    buzz     20000, 199, 50, 1         ; pulsewave source
    fsig    pvsanal  asig, 1024, 256, 1024, 0  ; create fsig
    kmod    linseg   0, p3/2, 1, p3/2, 0       ; simple control sig

    fsigout pvsmaska fsig, 2, kmod             ; apply weird eq to fsig
    aout    pvsynth  fsigout                   ; resynthesize,
            dispfft  aout, 0.1, 1024           ; and view the effect

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

Example 680. Example of the pvsynth 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
    ; Audio out   Audio in
    -odac    ;;;RT audio I/O
    ; For Non-realtime ouput leave only the line below:
    ; -o pvsynth.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 16
    nchnls = 1
    0dbfs = 1

    ;; example written by joachim heintz 2009

    instr 1
    ifftsize	=		1024
    ioverlap	=		ifftsize / 4
    iwinsize	=		ifftsize
    iwinshape	=		1  ; von-Hann window
    Sfile		=		"fox.wav"
    ain		soundin	Sfile
    fftin		pvsanal	ain, ifftsize, ioverlap, iwinsize, iwinshape; fft-analysis of the audio-signal
    aout		pvsynth	fftin; resynthesis
    		out		aout
    endin

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

## See Also

pvsanal, pvsadsyn

## Credits

Author: Richard Dobson
August 2001

New in version 4.13

February 2004. Thanks to a note from Francisco Vila, updated the example.

Prev | Up | Next
pvsvoc | Home | pvswarp