1
2declare name "phasemod -- phase modulation synth";
3declare author "Albert Graef";
4declare version "1.0";
5
6import("music.lib");
7
8// control variables
9
10// master volume and pan
11vol	= hslider("vol", 0.3, 0, 10, 0.01);	// %
12pan	= hslider("pan", 0.5, 0, 1, 0.01);	// %
13
14// ADSR envelop
15attack	= hslider("attack", 0.01, 0, 1, 0.001);	// sec
16decay	= hslider("decay", 0.3, 0, 1, 0.001);	// sec
17sustain = hslider("sustain", 0.5, 0, 1, 0.01);	// %
18release = hslider("release", 0.2, 0, 1, 0.001);	// sec
19
20// voice parameters
21freq	= nentry("freq", 440, 20, 20000, 1);	// Hz
22gain	= nentry("gain", 1, 0, 10, 0.01);	// %
23gate	= button("gate");			// 0/1
24
25// generic table-driven oscillator with phase modulation
26
27// n	= the size of the table, must be a power of 2
28// f	= the wave function, must be defined on the range [0,2*PI]
29// freq	= the desired frequency in Hz
30// mod	= the phase modulation signal, in radians
31
32tblosc(n,f,freq,mod)	= (1-d)*rdtable(n,wave,i&(n-1)) +
33			  d*rdtable(n,wave,(i+1)&(n-1))
34with {
35	wave	 	= time*(2.0*PI)/n : f;
36	phase		= freq/SR : (+ : decimal) ~ _;
37	modphase	= decimal(phase+mod/(2*PI))*n;
38	i		= int(floor(modphase));
39	d		= decimal(modphase);
40};
41
42// phase modulation synth (sine modulated by another sine)
43
44smooth(c) = *(1-c) : +~*(c);
45
46process	= tblosc(1<<16, sin, freq, mod) * env * (gain:smooth(0.999))
47  :  vgroup("2-master", *(vol) : panner(pan))
48with {
49	env = gate : vgroup("1-adsr", adsr(attack, decay, sustain, release));
50	mod = 2*PI*tblosc(1<<16, sin, freq, 0)*env;
51};
52