BlumFollowRadius | SuperCollider 3.13.0 Help

Description

Measure the encoding radius 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 encoding radius

Examples

NOTE: In the following example, note that with a constant amplitude, rotating a stereo signal has no effect on its analyzed radius!

(
~radiusTest = {
    var in, out;
    var amp, rotLFO;
    var instant, average;
    var makeUpDelay;
    var size = 2048;
    var halfSize = (size / 2).asInteger;

// amplitude: select one!
    amp = SinOsc.kr(0.5).range(0.05, 0.25);
    // amp = 0.25; // constant amplitude

// Inputs: select one
    in = SinOsc.ar([440, 330]);
    // in = PinkNoise.ar();

// rotation modulator
    rotLFO = LFSaw.kr(0.1).range(-pi/2, pi/2); // rotation angle oscillates between +/- pi/2

// apply rotation
    in = BlumRotate.ar(in, rotLFO);

// apply amplitude modulation
    in = in * amp;

// 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/BlumFollowRadius.schelp
link::BlumBox/Classes/BlumFollowRadius::

BlumFollowRadiusExtension

Description

Class Methods

.ar

.kr

Arguments:

Returns:

Examples

BlumFollowRadius
Extension