38 lines
1.1 KiB
Text
38 lines
1.1 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{(comb-n in maxDelayTime delayTime decayTime)}
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(comb-l in maxDelayTime delayTime decayTime)
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(comb-c in maxDelayTime delayTime decayTime)
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Comb delay line. comb-n uses no interpolation, comb-l uses linear
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interpolation, comb-c uses all pass interpolation. All times are in
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seconds. The decay time is the time for the echoes to decay by 60
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decibels. If this time is negative then the feedback coefficient
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will be negative, thus emphasizing only odd harmonics at an octave
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lower.
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Comb used as a resonator. The resonant fundamental is equal to
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reciprocal of the delay time.
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(define src (mul (white-noise ar) 0.01))
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(define ctl (x-line kr 0.0001 0.01 20 remove-synth))
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(define hear (lambda (u) (audition (out 0 u))))
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(hear (comb-n src 0.01 ctl 0.2))
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(hear (comb-l src 0.01 ctl 0.2))
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(hear (comb-c src 0.01 ctl 0.2))
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With negative feedback:
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(hear (comb-n src 0.01 ctl -0.2))
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(hear (comb-l src 0.01 ctl -0.2))
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(hear (comb-c src 0.01 ctl -0.2))
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Used as an echo.
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(hear (comb-n (mul (decay (mul (dust ar 1) 0.5) 0.2) (white-noise ar))
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0.2 0.2 3))
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