balance
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## balance

balance — Adjust one audio signal according to the values of another.

## Description

The rms power of asig can be interrogated, set, or adjusted to match that of a comparator signal.

## Syntax

    ares balance asig, acomp [, ihp] [, iskip]

## Initialization

ihp (optional) -- half-power point (in Hz) of a special internal low-pass filter. The default value is 10.

iskip (optional, default=0) -- initial disposition of internal data space (see reson). The default value is 0.

## Performance

asig -- input audio signal

acomp -- the comparator signal

balance outputs a version of asig, amplitude-modified so that its rms power is equal to that of a comparator signal acomp. Thus a signal that has suffered loss of power (eg., in passing through a filter bank) can be restored by matching it with, for instance, its own source. It should be noted that gain and balance provide amplitude modification only - output signals are not altered in any other respect.

## Examples

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

Example 78. Example of the balance 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     ;;;RT audio out
    ;-iadc    ;;;uncomment -iadc if RT audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o balance.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1
    ; Generate a band-limited pulse train.
    asrc buzz 0.9, 440, sr/440, 1

    ; Send the source signal through 2 filters.
    a1 reson asrc, 1000, 100
    a2 reson a1, 3000, 500

    ; Balance the filtered signal with the source.
    afin balance a2, asrc
         outs afin, afin

    endin

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

    i 1 0 2
    e

    </CsScore>
    </CsoundSynthesizer>

## See Also

balance2, gain, rms

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