46 lines
1.1 KiB
Racket
46 lines
1.1 KiB
Racket
#lang scribble/manual
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@(require (for-label racket))
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@title{(pv-mag-above buffer threshold)}
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Pass only bands where the magnitude is above `threshold'. This
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value is not normalized and is therefore dependant on the buffer
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size.
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@racketblock[
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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 11 2048 1))
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(async fd (b-alloc-read 12 "/home/rohan/audio/metal.wav" 0 0))))
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]
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@racketblock[
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(let* ((a (play-buf 1 12 (buf-rate-scale kr 12) 0 0 1))
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(x (mouse-x kr 1 100 0 0.1))
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(y (mouse-y kr 0 1 0 0.1))
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(c1 (fft* 10 a))
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(c2 (pv-copy c1 11))
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(c3 (pv-mag-below c1 x))
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(c4 (pv-mag-above c2 x)))
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(audition (out 0 (mul (mce2 (ifft* c3) (ifft* c4)) (mce2 y (sub 1 y))))))
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]
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@racketblock[
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(let* ((f1 (squared (mul-add (sin-osc kr 0.08 0) 6 6.2)))
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(f2 (mul-add (sin-osc kr f1 0) 100 800))
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(s (sin-osc ar f2 0))
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(x (mouse-x kr 1 1024 0 0.1))
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(y (mouse-y kr 0 1 0 0.1))
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(c1 (fft* 10 s))
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(c2 (pv-copy c1 11))
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(c3 (pv-mag-below c1 x))
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(c4 (pv-mag-above c2 x)))
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(audition (out 0 (mul (mce2 (ifft* c3) (ifft* c4)) (mce2 y (sub 1 y))))))
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]
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