max_k
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## max_k

max_k — Local maximum (or minimum) value of an incoming asig signal

## Description

max_k outputs the local maximum (or minimum) value of the incoming asig signal, checked in the time interval between ktrig has become true twice.

## Syntax

    knumkout max_k asig, ktrig, itype

## Initialization

itype - itype determinates the behaviour of max_k (see below)

## Performance

asig - incoming (input) signal

ktrig - trigger signal

max_k outputs the local maximum (or minimum) value of the incoming asig signal, checked in the time interval between ktrig has become true twice. itype determinates the behaviour of max_k:

1 - absolute maximum (sign of negative values is changed to positive before evaluation).

2 - actual maximum.

3 - actual minimum.

4 - calculate average value of asig in the time interval since the last trigger.

This opcode can be useful in several situations, for example to implement a vu-meter.

## Examples

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

Example 576. Example of the max_k 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  ;-Ma   ;;;realtime audio out and midi in (on all inputs)
    ;-iadc    ;;;uncomment -iadc if RT audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o max_k.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    ; by Stefano Cucchi 2020

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

    instr 1

    anoise noise 0.1, 0.1 ; generate some noise
    arandom randomi 400, 12000, 4 ; generate random numbers from 400 to 1200

    ktrig metro 3 ; trigger signal

    kmin max_k arandom, ktrig, 3 ; minumum value
    kmax max_k arandom, ktrig, 2 ; maximum value

    printk 0.2, kmin
    printk 0.2, kmax

    anoisehp butterhp anoise, kmin ; hipass filter at kmin frequency
    anoiselp butterlp anoise, kmax*0.5 ; lopass filter at kmin/2 frequency

    acomp oscil 0.1, 440 ; comparator signal for consistent amplitude

    anoisehp balance anoisehp, acomp ; adjusting the volume
    anoiselp balance anoiselp, acomp ; adjusting the volume

    outs anoisehp, anoiselp

    endin

    </CsInstruments>
    <CsScore>

    i1 0 10
    e
    </CsScore>
    </CsoundSynthesizer>

## Credits

Written by Gabriel Maldonado.

New in Csound 5 (Previously available only on CsoundAV)

Fixed to agree with documentation in 5.15

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