95 lines
2.1 KiB
Racket
95 lines
2.1 KiB
Racket
#lang scribble/manual
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@(require (for-label racket))
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@title{LFPar}
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Parabolic oscillator@section{related}
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Classes/LFCub, Classes/LFPulse, Classes/LFSaw, Classes/LFTri
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@section{categories}
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UGens>Generators>Deterministic
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@section{description}
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A sine-like shape made of two parabolas and the integral of a triangular wave. It has audible odd harmonics and is non-band-limited.
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Output ranges from -1 to +1.
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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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freq
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Frequency in Hertz.
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@section{argument}
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iphase
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Initial phase in cycles ( 0..1 ).
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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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// a plot
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{ LFPar.ar(Line.kr(100, 800, 0.1)) }.plot(0.1);
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// 440 Hz wave
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{ LFPar.ar(440) * 0.1 }.play;
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// modulating frequency:
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{ LFPar.ar(XLine.kr(100, 2000, 10)) * 0.1 }.play;
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// amplitude modulation:
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{ LFPar.kr(XLine.kr(1, 200, 10)) * SinOsc.ar(440) * 0.1 }.play;
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// used as both Oscillator and LFO:
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{ LFPar.ar(LFPar.kr(3, 0.3, 200, 400)) * 0.1 }.play;
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// used as phase modulator (behaves like a triangular modulator in FM):
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// Compare:
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{SinOsc.ar(440, LFPar.ar(1, 2, mul: 8pi))}.play
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{SinOsc.ar(440 + LFTri.ar(1, mul: 8pi))}.play
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// more examples:
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{ LFPar.ar(LFPar.kr(LFPar.kr(0.2,0,8,10), 0, 400,800),0,0.1) }.play
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{ LFPar.ar(LFPar.kr(0.2, 0, 400,800),0,0.1) }.play
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{ LFPar.ar(800,0,0.1) }.play
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{ LFPar.ar(XLine.kr(100,8000,30),0,0.1) }.play
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// compare:
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{ LFCub.ar(LFCub.kr(LFCub.kr(0.2,0,8,10),0, 400,800),0,0.1) }.play
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{ LFCub.ar(LFCub.kr(0.2, 0, 400,800),0,0.1) }.play
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{ LFCub.ar(800,0,0.1) }.play
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{ LFCub.ar(XLine.kr(100,8000,30),0,0.1) }.play
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{ SinOsc.ar(SinOsc.kr(SinOsc.kr(0.2,0,8,10),0, 400,800),0,0.1) }.play
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{ SinOsc.ar(SinOsc.kr(0.2, 0, 400,800),0,0.1) }.play
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{ SinOsc.ar(800,0,0.1) }.play
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{ SinOsc.ar(XLine.kr(100,8000,30),0,0.1) }.play
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{ LFTri.ar(LFTri.kr(LFTri.kr(0.2,0,8,10),0, 400,800),0,0.1) }.play
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{ LFTri.ar(LFTri.kr(0.2, 0, 400,800),0,0.1) }.play
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{ LFTri.ar(800,0,0.1) }.play
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{ LFTri.ar(XLine.kr(100,8000,30),0,0.1) }.play
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::
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]
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