23 lines
579 B
Racket
23 lines
579 B
Racket
#lang scribble/manual
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@(require (for-label racket))
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@title{(pv-local-max buffer threshold)}
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Pass bins which are a local maximum
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Passes only bins whose magnitude is above a threshold and above
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their nearest neighbors.
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buffer - fft buffer.
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threshold - magnitude threshold.
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(with-sc3
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(lambda (fd)
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(async fd (b-alloc 10 2048 1))
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(async fd (b-alloc-read 12 "/home/rohan/audio/metal.wav" 0 0))))
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(let* ((a (play-buf 1 12 (buf-rate-scale kr 12) 0 0 1))
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(f (fft* 10 a))
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(h (pv-local-max f (mouse-x kr 0 100 0 0.1))))
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(audition (out 0 (mul (ifft* h) 0.5))))
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