101 lines
1.3 KiB
Text
101 lines
1.3 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{MidEQ}
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Parametric filter.@section{categories}
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UGens>Filters>Linear
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@section{description}
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Attenuates or boosts a frequency band.
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@section{classmethods}
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@section{method}
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ar, kr
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@section{argument}
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in
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The input signal.
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@section{argument}
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freq
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Center frequency of the band in Hertz.
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@section{argument}
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rq
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The reciprocal of Q (bandwidth / cutoffFreq).
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@section{argument}
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db
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Amount of boost (db > 0) or attenuation (db < 0) of the
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frequency band.
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@section{argument}
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mul
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Output will be multiplied by this value.
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@section{argument}
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add
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This value will be added to the output.
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@section{Examples}
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@racketblock[
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// mixer parametric eq as wahwah
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{ MidEQ.ar(Saw.ar(200,0.2), FSinOsc.kr(1, 0, 24, 84).midicps, 0.3, 12) }.play
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// notch filter
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(
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{ var in;
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in = PinkNoise.ar(0.2) + SinOsc.ar(600, 0, 0.1);
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MidEQ.ar(in, SinOsc.kr(0.2, 0.5pi) * 2 + 600, 0.01, -24)
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}.play
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)
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/////
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// first start the synth
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(
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x = {| freq=400, db=0, rq=0.1 |
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var in;
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in = SinOsc.ar([ 400, 420 ], 0, 0.4);
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MidEQ.ar(in, freq, Lag.kr(rq, 0.3), db)
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}.play
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)
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// now play with its parameters to hear how the filter affects two frequencies
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// that are very close to each other
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x.set(\db, -12)
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x.set(\rq, 0.1)
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x.set(\rq, 0.03)
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x.set(\freq, 410)
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x.set(\freq, 420)
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x.set(\freq, 400)
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x.set(\freq, 500)
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::
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]
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