56 lines
1.5 KiB
Text
56 lines
1.5 KiB
Text
class:: Unpack1FFT
|
|
summary:: Unpack a single value (magnitude or phase) from an FFT chain
|
|
categories:: UGens>FFT
|
|
related:: Classes/PackFFT, Classes/UnpackFFT
|
|
|
|
|
|
Unpack1FFT(chain, bufsize, binindex, whichmeasure=0)
|
|
|
|
description::
|
|
Takes an FFT chain and extracts a single scalar value as a demand-rate stream. To call it you need a "demander" which fires whenever the FFT chain fires - this is normally achieved using link::Classes/PackFFT:: but can also be done using link::Classes/Demand::.
|
|
|
|
Note::
|
|
The main purpose of this UGen is as a component in pvcollect, pvcalc, and pvcalc2 processes. You're welcome to use it on its own - the example below shows basic usage. But most people won't typically need to use it directly.
|
|
::
|
|
|
|
classmethods::
|
|
private:: categories
|
|
|
|
method:: new
|
|
|
|
argument:: chain
|
|
an FFT chain
|
|
argument:: bufsize
|
|
the size of the expected input FFT frames
|
|
argument:: binindex
|
|
the integer index of the bin you want to query
|
|
argument:: whichmeasure
|
|
0 for magnitude and 1 for phase. None of these arguments can be modulated.
|
|
|
|
examples::
|
|
code::
|
|
(
|
|
s.waitForBoot({
|
|
c = Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01.wav");
|
|
})
|
|
)
|
|
|
|
// Let's extract the DC component - i.e. the magnitude at index zero.
|
|
(
|
|
x = {
|
|
var fftsize = 1024;
|
|
var sig, chain, unp;
|
|
sig = PlayBuf.ar(1, c, BufRateScale.kr(c), loop: 1);
|
|
chain = FFT(LocalBuf(fftsize), sig);
|
|
|
|
unp = Unpack1FFT(chain, b.numFrames, 0, 0);
|
|
|
|
// Demand some data from the unpacker
|
|
Demand.kr(chain>=0, 0, unp).poll(chain>=0, "unpacked value");
|
|
|
|
(sig*0.1).dup;
|
|
}.play(s);
|
|
)
|
|
x.free;
|
|
::
|
|
|