object Crest extends ProductReader[Crest] with Serializable
A UGen that measures the "crest factor" of a time-domain signal. The "crest factor" is the ratio of the absolute peak to the absolute mean over a certain time period. In pseudocode:
crest = (samples.abs.max) / (samples.abs.mean)
For Pulse waves the value will be 1, because the mean and the maximum are the
same. For SinOsc , the theoretical value is 2.sqrt . For Saw it is
3.sqrt . These exact values might not occur in practice, because of
anti-aliasing and other sampling factors.
This is not to be confused with FFTCrest which does the same thing for
spectral data.
Examples
// mouse movement varies from sine wave (left) to almost-square (right) play { val sig = (SinOsc.ar(MouseY.kr(100, 1000, 1)) * MouseX.kr(1,10)).clip2(1) Crest.kr(sig, 440).poll Pan2.ar(sig * 0.1) }
This is a third-party UGen (MCLDUGens).
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- def kr(in: GE, length: GE = 400, gate: GE = 1.0f): Crest
- in
signal to analyze, can be audio rate or control rate
- length
number of samples over which to take the measurement. A buffer of this size is created internally (so be careful about specifying a massive number here). (init-time only)
- gate
normally the statistic is calculated on every control block cycle. If one wants it less often (e.g. to reduce CPU usage), one can modulate this – calculation only occurs if gate is greater than zero.
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