rsc3/doc/help/ugen/noise/lfd-noise0.help.scrbl

#lang scribble/manual
@(require (for-label racket))

@title{(lfd-noise0 rate freq)}

(lfd-noise1 rate freq)
(lfd-noise3 rate freq)

lfd-noise0: Dynamic step noise. Like lf-noise0, it generates random
values at a rate given by the freq argument, with two differences:
no time quantization, and fast recovery from low freq values.

lfd-noise1: Dynamic ramp noise. Like lf-noise1, it generates linearly
interpolated random values at a rate given by the freq argument,
with two differences: no time quantization, and fast recovery from
low freq values.

lfd-noise3: Dynamic cubic noise. Like Lf-Noise3, it generates
linearly interpolated random values at a rate given by the freq
argument, with two differences: no time quantization, and fast
recovery from low freq values.

lf-noise0,1,3 quantize to the nearest integer division of the
samplerate, and they poll the freq argument only when scheduled,
and thus seem to hang when freqs get very low).

If you don't need very high or very low freqs, or use fixed freqs,
lf-noise0,1,3 is more efficient.

Try wiggling mouse quickly; Lf-Noise frequently seems stuck,
LFDNoise changes smoothly.


@racketblock[
(audition
 (out 0 (mul (lf-noise0 ar (mouse-x kr 0.1 1000 1 0.1)) 0.1)))
]


@racketblock[
(audition
 (out 0 (mul (lfd-noise0 ar (mouse-x kr 0.1 1000 1 0.1)) 0.1)))
]

silent for 2 secs before going up in freq


@racketblock[
(audition
 (out 0 (mul (lf-noise0 ar (x-line kr 0.5 10000 3 remove-synth)) 0.1)))
]


@racketblock[
(audition
 (out 0 (mul (lfd-noise0 ar (x-line kr 0.5 10000 3 remove-synth)) 0.1)))
]

lf-noise quantizes time steps at high freqs, lfd-noise does not:


@racketblock[
(audition
 (out 0 (mul (lf-noise0 ar (x-line kr 1000 20000 10 remove-synth)) 0.1)))
]


@racketblock[
(audition
 (out 0 (mul (lfd-noise0 ar (x-line kr 1000 20000 10 remove-synth)) 0.1)))
]