mac
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## mac

mac — Multiplies and accumulates a- and k-rate signals.

## Description

Multiplies and accumulates a- and k-rate signals.

## Syntax

    ares mac ksig1, asig1 [, ksig2] [, asig2] [, ksig3] [, asig3] [...]

## Performance

ksig1, etc. -- k-rate input signals

asig1, etc. -- a-rate input signals

mac multiplies and accumulates a- and k-rate signals. It is equivalent to:

ares = asig1*ksig1 + asig2*ksig2 + asig3*ksig3 + ...

## Examples

Here is an example of the mac opcode. It uses the file mac.csd. It is written for *NIX systems, and will generate errors on Windows.

Example 565. Example of the mac 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 real audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o mac.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1	;4 band equalizer

    klow =	p4	;low gain1
    klmid =	p5	;low gain2
    kmidh = p6	;high gain1
    khigh =	p7	;high gain2
    ifn  =  p8	;table

    ilc1 table 0, ifn	;low freqency range
    ilc2 table 1, ifn	;low-mid
    ihc1 table 2, ifn	;mid-high
    ihc2 table 3, ifn	;high

    asig	diskin2	 "fox.wav", 1
    alow1	butterlp asig, ilc1		;lowpass 1
    almid	butterlp asig, ilc2	      	;lowpass 2
    amidh 	butterhp asig, ihc1	       	;highpass 1
    ahigh	butterhp asig, ihc2		;highpass 2
    aout	mac	 klow, alow1, klmid, almid, kmidh, amidh, khigh, ahigh
            outs	 aout, aout

    endin
    </CsInstruments>
    <CsScore>
    f1 0  4 -2 150 300 600  5000
    f2 0  4 -2 75  500 1000 10000
    f3 0  4 -2 200 700 1500 3000

    ;          low lowmid midhigh high table
    i 1 0  2.8  2    1      1      1     1
    i 1 3  2.8  2    3      1      1     2
    i 1 6  2.8  2    1      2      3     3
    e
    </CsScore>
    </CsoundSynthesizer>

## See also

Opcode Equivalents of Functions

## Credits

Author: John ffitch
University of Bath, Codemist, Ltd.
Bath, UK
May 1999

New in Csound version 3.54

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