pvsblur
Prev | Orchestra Opcodes and Operators | Next

## pvsblur

pvsblur — Average the amp/freq time functions of each analysis channel for a specified time.

## Description

Average the amp/freq time functions of each analysis channel for a specified time (truncated to number of frames). As a side-effect the input pvoc stream will be delayed by that amount.

## Syntax

    fsig pvsblur fsigin, kblurtime, imaxdel

## Performance

fsig -- output pv stream

fsigin -- input pv stream.

kblurtime -- time in secs during which windows will be averaged .

imaxdel -- maximum delay time, used for allocating memory used in the averaging operation.

This opcode will blur a pvstream by smoothing the amplitude and frequency time functions (a type of low-pass filtering); the amount of blur will depend on the length of the averaging period, larger blurtimes will result in a more pronounced effect.

| 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 use of the pvsblur opcode. It uses the file pvsblur.csd.

Example 703. Example of the pvsblur opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    -odac
    </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
    fftblur	pvsblur	fftin, p4, 1; blur
    aout		pvsynth	fftblur; resynthesis
    		out		aout
    endin

    </CsInstruments>
    <CsScore>
    i 1 0 3 0
    i 1 3 3 .1
    i 1 6 3 .5
    e
    </CsScore>
    </CsoundSynthesizer>

## See Also

pvsanal, pvsynth, pvsadsyn

## Credits

Author: Victor Lazzarini
November 2004

New plugin in version 5

November 2004.

Prev | Up | Next
pvsbin | Home | pvsbuffer