rsc3/doc-schelp/HelpSource/Classes/Harmonics.scrbl

#lang scribble/manual
@(require (for-label racket))

@title{Harmonics}
 Convenient factory for filling buffers with harmonics on the server@section{categories}
  Collections, Server, UGens>Buffer

@section{description}

Harmonics objects are convenient factories for creating Arrays that are used to fill buffers using the b_gen sine fill commands on the server.

@section{CLASSMETHODS}
 

@section{method}
 new
Create a new Harmonics array of size. Nothing is filled in for you, until instance methods are applied.

@racketblock[
a = Harmonics.new(16);	// just returns an instance of Harmonics with size
::

]
@section{INSTANCEMETHODS}
 

@section{method}
 ramp

@racketblock[
a.ramp(1.0, 1.0);	// returns a harmonic series

b = Buffer.alloc(s, 512, 1);
// harmonic series for freqs, ramp down for amps
b.sine2(a.ramp(1.0, 1.0).postln, a.ramp(0.5, -0.025).postln, true, true, true);
(
z = SynthDef("help-Osc",{ arg out=0,bufnum=0;
	Out.ar(out,
		Osc.ar(bufnum, 200, 0, 0.5)
	)
});
)
y = z.play(s,[\out, 0, \bufnum, b]);
y.free;
::

]
@section{method}
 decay
Implements the formula: 1 / ((i+1) ** k)

@racketblock[
a.decay(1.0);

b.sine2(a.ramp(1.0, 1.0).postln, a.decay(1.0).postln, true, true, true);
y = z.play(s,[\out, 0, \bufnum, b]);
y.free;
::

]
@section{method}
 geom
Implements the formula: 1 / (i ** k)

@racketblock[
a.geom(1.2);

b.sine2(a.ramp(1.0, 1.0).postln, a.geom(1.2).postln, true, true, true);
y = z.play(s,[\out, 0, \bufnum, b]);
y.free;
::

]
@section{method}
 formant
Create a formant like structure.

@racketblock[
a.formant(6, 3);

b.sine2(a.formant(12, 3).postln, a.geom(1.2), true, true, true);
y = z.play(s,[\out, 0, \bufnum, b]);
y.free;
::

]
@section{method}
 teeth

@racketblock[
a.teeth(6, 3);

b.sine2(a.teeth(2, 3).postln, a.geom(1.2), true, true, true);
y = z.play(s,[\out, 0, \bufnum, b]);
b.sine2(a.teeth(4, 1).postln, a.geom(1.2), true, true, true);
b.sine2(a.teeth(1, 3).postln, a.geom(1.2), true, true, true);
b.sine2(a.teeth(2, 3).postln, a.geom(1.2), true, true, true);
y.free;
::

]
@section{method}
 cutoff
Returns 1.0 to the nth place, fills the rest with 0.0

@racketblock[
a.cutoff(3);

b.sine2(a.ramp(1.0, 1.0), a.cutoff(3), true, true, true);
y = z.play(s,[\out, 0, \bufnum, b]);
b.sine2(a.ramp(1.0, 1.0), a.cutoff(3), true, true, true);
b.sine2(a.ramp(1.0, 1.0), a.cutoff(5), true, true, true);
b.sine2(a.ramp(1.0, 1.0), a.cutoff(1), true, true, true);
y.free;
::

]
@section{method}
 shelf

@racketblock[
a.shelf(0, 6, 1, 0);

b.sine2(a.ramp(1.0, 1.0), a.shelf(0, 6, 1, 0).postln , true, true, true);
y = z.play(s,[\out, 0, \bufnum, b]);
b.sine2(a.ramp(1.0, 1.0), a.shelf(0, 11, 1, 0).postln , true, true, true);
b.sine2(a.ramp(1.0, 1.0), a.shelf(2, 6, 1, 0).postln , true, true, true);
b.sine2(a.ramp(1.0, 1.0), a.shelf(6, 8, 1, 0).postln , true, true, true);
y.free;
::

]
@section{method}
 sine

@racketblock[
a.sine(8, 0, 1, 0);

b.sine2(a.ramp(1.0, 1.0), a.sine(8, 0, 1, 0).postln , true, true, true);
y = z.play(s,[\out, 0, \bufnum, b]);
b.sine2(a.ramp(1.0, 1.0), a.sine(4, 0, 1, 0).postln , true, true, true);
b.sine2(a.ramp(1.0, 1.0), a.sine(2.2, 0.5pi, 0.4, 0.2).postln , true, true, true);
b.sine2(a.ramp(1.0, 1.0), a.sine(pi, 0.25pi, 0.5, 0).postln , true, true, true);
y.free;
::

]
@section{method}
 pulse

@racketblock[
a.pulse(8, 0, 2, 1, 0);

b.sine2(a.ramp(1.0, 1.0), a.pulse(8, 0, 2, 1, 0).postln , true, true, true);
y = z.play(s,[\out, 0, \bufnum, b]);
b.sine2(a.ramp(1.0, 1.0), a.pulse(8, 0, 2, 1, 0).postln , true, true, true);
b.sine2(a.ramp(1.0, 1.0), a.pulse(4, 0, 2, 0.4, 0.2).postln , true, true, true);
b.sine2(a.ramp(1.0, 1.0), a.pulse(7, 0.5pi, 3, 0.5, 0.1).postln , true, true, true);
y.free;
::

]
@section{method}
  rand, exprand, linrand
@section{method}
  rand2
@section{method}
  coin