fold
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## fold

fold — Adds artificial foldover to an audio signal.

## Description

Adds artificial foldover to an audio signal.

## Syntax

    ares fold asig, kincr

## Performance

asig -- input signal

kincr -- amount of foldover expressed in multiple of sampling rate. Must be >= 1

fold is an opcode which creates artificial foldover. For example, when kincr is equal to 1 with sr=44100, no foldover is added. When kincr is set to 2, the foldover is equivalent to a downsampling to 22050, when it is set to 4, to 11025 etc. Fractional values of kincr are possible, allowing a continuous variation of foldover amount. This can be used for a wide range of special effects.

## Examples

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

Example 368. Example of the fold 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 fold.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1

    asig  poscil3 .8, 400, 1 ;very clean sine
    kincr line p4, p3, p5
    asig  fold asig, kincr
          outs asig, asig

    endin
    </CsInstruments>
    <CsScore>
    ;sine wave.
    f 1 0 16384 10 1

    i 1 0  4 2  2
    i 1 5  4 5  5
    i 1 10 4 10 10
    i 1 15 4 1 100	; Vary the fold-over amount from 1 to 100

    e
    </CsScore>
    </CsoundSynthesizer>

## See also

Sample Level Operators

## Credits

Author: Gabriel Maldonado
Italy
1999

New in Csound version 3.56

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