BlumFollowPower | SuperCollider 3.13.0 Help

Description

Measure the power of a stereo signal.

Class Methods

.ar

.kr

Arguments:

in	The stereo input, an array: [L, R]
size	Number of samples for Hilbert window (i.e. FFT size) or running sum. See RunningSum and HilbertW for more info. NOTE: For instantaneous analysis, size must be a power of two!
method	`\instant` for instantaneous analysis or `\average` for time-averaged analysis

Returns:

Signal power

Examples

(
~powerTest = {
    var in, out;
    var freqLFO, ampLFO;
    var instant, average;
    var makeUpDelay;
    var size = 2048;
    var halfSize = (size / 2).asInteger;

freqLFO = LFNoise2.kr(72).range(0.9, 1.1);
    ampLFO = SinOsc.kr(0.5).range(0.01, 0.5);

// Sinusoids
    in = SinOsc.ar([440 * freqLFO, 330 * freqLFO]);
    // in = SinOsc.ar([220, 0]); // Fully L
    // in = SinOsc.ar([0, 220]); // Fully R

// Note how power changes using only one channel of the stereo input!

// Noise
    // in =  PinkNoise.ar([1.0, 1.0]);

// apply amplitude LFO
    in = in * ampLFO;

// Instant and average output
    instant = BlumFollowPower.ar(in, method: \instant);
    average = BlumFollowPower.ar(in, method: \average);

// match delay of instant and average for comparison
    makeUpDelay = ((halfSize * SampleDur.ir) - ControlDur.ir);
    average = DelayN.ar(average, makeUpDelay, makeUpDelay);

// Select one: ompare instant vs average
    // out = average;
    out = instant;
    // out = (instant.neg + average); // difference between instantaneous and average

// write analysis to post window
    out.poll(label: "analyzed");

// listen to source
    in
}.play
)

helpfile source: HelpSource/Classes/BlumFollowPower.schelp
link::BlumBox/Classes/BlumFollowPower::

BlumFollowPowerExtension

Description

Class Methods

.ar

.kr

Arguments:

Returns:

Examples

BlumFollowPower
Extension