39 lines
1.3 KiB
Text
39 lines
1.3 KiB
Text
|
#lang scribble/manual
|
||
|
|
@(require (for-label racket))
|
||
|
|
|
||
|
|
@title{(allpass-n in maxDelayTime delayTime decayTime)}
|
||
|
|
|
||
|
|
All pass delay line. allpass-n uses no interpolation, allpass-l uses
|
||
|
|
linear interpolation, allpass-c uses all pass interpolation. All
|
||
|
|
time values are in seconds. The decay time is the time for the
|
||
|
|
echoes to decay by 60 decibels. If this time is negative then the
|
||
|
|
feedback coefficient will be negative, thus emphasizing only odd
|
||
|
|
harmonics at an octave lower.
|
||
|
|
|
||
|
|
Since the allpass delay has no audible effect as a resonator on
|
||
|
|
steady state sound ...
|
||
|
|
|
||
|
|
(define z (mul (white-noise ar) 0.1))
|
||
|
|
|
||
|
|
(audition (out 0 (allpass-c z 0.01 (x-line kr 0.0001 0.01 20 do-nothing) 0.2)))
|
||
|
|
|
||
|
|
...these examples add the input to the effected sound so that you
|
||
|
|
can hear the effect of the phase comb.
|
||
|
|
|
||
|
|
(audition
|
||
|
|
(out 0 (add z (allpass-n z 0.01 (x-line kr 0.0001 0.01 20 do-nothing) 0.2))))
|
||
|
|
|
||
|
|
(audition
|
||
|
|
(out 0 (add z (allpass-l z 0.01 (x-line kr 0.0001 0.01 20 do-nothing) 0.2))))
|
||
|
|
|
||
|
|
(audition
|
||
|
|
(out 0 (add z (allpass-c z 0.01 (x-line kr 0.0001 0.01 20 do-nothing) 0.2))))
|
||
|
|
|
||
|
|
Used as an echo - doesn't really sound different than Comb, but it
|
||
|
|
outputs the input signal immediately (inverted) and the echoes are
|
||
|
|
lower in amplitude.
|
||
|
|
|
||
|
|
(audition
|
||
|
|
(out 0 (allpass-n (mul (decay (dust ar 1) 0.2) z) 0.2 0.2 3)))
|
||
|
|
|