maxabs
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## maxabs

maxabs — Produces a signal that is the maximum of the absolute values of any number of input signals.

## Description

The maxabs opcode takes any number of a-rate or k-rate signals as input (all of the same rate), and outputs a signal at the same rate that is the maximum of all of the inputs. It is identical to the max opcode except that it takes the absolute value of each input before comparing them. Therefore, the output is always non-negative. For a-rate signals, the inputs are compared one sample at a time (i.e. maxabs does not scan an entire ksmps period of a signal for its local maximum as the max_k opcode does).

## Syntax

    amax maxabs ain1, ain2 [, ain3] [, ain4] [...]

    kmax maxabs kin1, kin2 [, kin3] [, kin4] [...]

## Performance

ain1, ain2, ... -- a-rate signals to be compared.

kin1, kin2, ... -- k-rate signals to be compared.

## Examples

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

Example 552. Example of the maxabs 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 maxabs.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1

    k1   oscili 1, 10.0, 1			;combine 3 sinusses
    k2   oscili 1, 1.0, 1			;at different rates
    k3   oscili 1, 3.0, 1
    kmax maxabs   k1, k2, k3
    kmax = kmax*250				;scale kmax
    printk2 kmax				;check the values

    aout vco2 .5, 220, 6			;sawtooth
    asig moogvcf2 aout, 600+kmax, .5 	;change filter above 600 Hz
         outs asig, asig

    endin

    </CsInstruments>
    <CsScore>
    f1 0 32768 10 1

    i1 0 5
    e
    </CsScore>
    </CsoundSynthesizer>

## See Also

minabs, max, min, maxaccum, minaccum, maxabsaccum, minabsaccum, max_k

## Credits

Author: Anthony Kozar
March 2006

New in Csound version 5.01

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