68 lines
1.2 KiB
Text
68 lines
1.2 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{PV_LocalMax}
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Pass bins which are a local maximum.@section{related}
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Classes/FFT, Classes/IFFT, Classes/PV_MagAbove, Classes/PV_MagBelow, Classes/PV_MagClip
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@section{categories}
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UGens>FFT
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@section{description}
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Passes only bins whose magnitude is above a threshold and above their nearest neighbors.
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@section{classmethods}
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@section{method}
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new
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@section{argument}
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buffer
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FFT buffer.
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@section{argument}
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threshold
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Magnitude threshold.
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@section{Examples}
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@racketblock[
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s.boot;
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b = Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01.wav");
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(
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SynthDef("help-localMax", { arg out=0;
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var in, chain;
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in = Mix.arFill(3, { LFSaw.ar(exprand(100, 500), 0, 0.1); });
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chain = FFT(LocalBuf(2048), in);
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chain = PV_LocalMax(chain, MouseX.kr(0, 50));
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Out.ar(out, 0.5 * IFFT(chain).dup);
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}).play(s);
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)
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(
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SynthDef("help-localMax2", { arg out=0, soundBufnum=2;
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var in, chain;
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in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);
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chain = FFT(LocalBuf(2048), in);
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chain = PV_LocalMax(chain, MouseX.kr(0, 100));
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Out.ar(out, 0.1 * IFFT(chain).dup);
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}).play(s, [\soundBufnum, b]);
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)
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::
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]
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