1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
class:: FreqShift
summary:: Frequency Shifter.
related:: Classes/Hilbert, Classes/HilbertFIR
categories:: UGens>Filters>Nonlinear, UGens>Filters>Pitch
Description::
FreqShift implements single sideband amplitude modulation, also known as
frequency shifting, but not to be confused with pitch shifting. Frequency
shifting moves all the components of a signal by a fixed amount but does
not preserve the original harmonic relationships.
classmethods::
method::ar
argument::in
The input signal.
argument::freq
Amount of shift in cycles per second.
argument::phase
Phase of the frequency shift (0..2pi).
argument::mul
argument::add
Examples::
code::
// shifting a 100Hz tone by 1 Hz rising to 500Hz
{FreqShift.ar(SinOsc.ar(100),XLine.kr(1,500,5),0,[0.1,0.1])}.play(s);
// shifting a complex tone by 1 Hz rising to 500Hz
{FreqShift.ar(Klang.ar(`[[101,303,606,808]]),XLine.kr(1,500,10),0,[0.1,0.1])}.play(s);
// modulating shift and phase
{FreqShift.ar(SinOsc.ar(10),LFNoise2.ar(0.3,1500),SinOsc.ar(500).range(0,2pi),[0.1,0.1])}.play(s);
// the ubiquitous houston example
(
b = Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01.wav");
{FreqShift.ar(PlayBuf.ar(1,b.bufnum,BufRateScale.kr(b.bufnum),loop:1),LFNoise0.kr(0.45,1000),0,[1,1])}.play(s);
)
// shifting bandpassed noise
{FreqShift.ar(BPF.ar(WhiteNoise.ar(0.2),1000,0.001),LFNoise0.kr(5.5,1000),0,[32,32])}.play(s);
::
subsection:: More Examples
send a SynthDef, run the routine then send a different SynthDef
code::
(// simple detune & pitchmod via FreqShift
SynthDef("frqShift1",{arg frq,detune=1.5;
var e1,left,right;
e1 = EnvGen.ar(Env.new([0,0.1,0],[1,2.3]),1,doneAction:2);
left = SinOsc.ar(frq,0,e1); // original tone
left = left + FreqShift.ar(left,frq*detune); // shift and add back to original
right = FreqShift.ar(left,SinOsc.kr(3.23,0,5));
Out.ar(0, [left,right] * 0.1);
}).add;
)
(// the routine
r = Routine({
var table,pitch;
table = [0,2,4,5,7,9,11,12];
inf.do{
pitch = (48+(12*2.rand) + table.choose).midicps;
Synth.grain(\frqShift1, [\frq, pitch]);
3.wait;
};
};
).play;
)
(// shift pulse wave in opposite directions
SynthDef("frqShift1",{arg frq,detune=0.15;
var e1,snd,left,right;
e1 = EnvGen.ar(Env.new([0,1,0],[0.02,3.2]),1,doneAction:2);
snd = Pulse.ar(frq,SinOsc.kr(2.3).range(0.2,0.8),e1); // original tone
left = FreqShift.ar(snd,XLine.kr(-0.1,-200,2)); // shift and add back to original
right = FreqShift.ar(snd,XLine.kr(0.1,200,2));
Out.ar(0, [left,right] * 0.1);
}).add
)
(// FreqShift >> feedback >>> FreqShiftc
SynthDef("frqShift1",{arg frq;
var e1,snd,snd2,in;
in = FreqShift.ar(InFeedback.ar(0,1)*3.2,XLine.ar(0.01,frq*1.5,1)); // shift the feedback
e1 = Env.new([0,0.1,0],[0.02,2.98]);
snd = SinOsc.ar(frq,0,EnvGen.ar(e1,1,doneAction:2));
snd2 = FreqShift.ar(snd+in,SinOsc.ar(4.24,0.5,3),0,0.5); // subtle modulating shift
OffsetOut.ar([0,1], Limiter.ar(snd2+snd * 0.5,1,0.005));
}).add;
)
(// ssllooww columbia tuned shift detune
r.stop; // stop old routine
Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01.wav", bufnum:99);
SynthDef("frqShift1",{arg frq, bufnum;
var e1,snd,left,right;
e1 = Env.new([0,1,0],[3,1],-4);
snd = PlayBuf.ar(1, bufnum, BufRateScale.kr(bufnum) * 0.01, loop:1);
left = FreqShift.ar(snd,frq*2,0,EnvGen.ar(e1,1,doneAction:2)); // subtle shift of the output
right = FreqShift.ar(snd,frq*3,0,EnvGen.ar(e1,1,doneAction:2));
Out.ar(0, [left,right] * 3);
}).add;
(// the routine
r = Routine({
var table,pitch;
table = [0,2,4,5,7,9,11,12];
inf.do{
pitch = (48+(12*2.rand) + table.choose).midicps;
s.sendMsg("s_new","frqShift1",-1,1,1, "frq", pitch, "bufnum", 99);
3.wait;
};
};
).play;
)
::
|
