pvslock
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## pvslock

pvslock — Frequency lock an input fsig

## Description

This opcode searches for spectral peaks and then locks the frequencies around those peaks. This is similar to phase-locking in non-streaming PV processing. It can be used to improve timestretching and pitch-shifting quality in PV processing.

## Syntax

    fsig pvslock fsigin, klock

## Performance

fsig -- output pv stream

fsigin -- input pv stream.

klock -- frequency lock, 1 -> lock, 0 -> unlock (bypass).

| Warning
It is unsafe to use the same f-variable for both input and output of pvs opcodes. Using the same one might lead to undefined behavior on some opcodes. Use a different one on the left and right sides of the opcode.

## Examples

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

Example 810. Example of the pvslock 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 pvslock.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    gifil ftgen 0, 0, 0, 1, "fox.wav", 0, 0, 1

    instr 1

    klock	= p4
    fsig    pvstanal 1, 1, 1, gifil	; no further transformations
    fsigout	pvslock  fsig, klock	; lock frequency
    aout    pvsynth  fsigout
            outs     aout, aout

    endin
    </CsInstruments>
    <CsScore>

    i 1 0 2.6 1	; locked
    i 1 3 2.6 0	; not locked

    e
    </CsScore>
    </CsoundSynthesizer>

## Credits

Author: Victor Lazzarini
November 2004

New plugin in version 5

November 2004.

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