noises.lib
Faust Noise Generator Library. Its official prefix is no
.
Functions Reference
(no.)noise
White noise generator (outputs random number between -1 and 1).
Noise
is a standard Faust function.
Usage
noise : _
(no.)multirandom
Generates multiple decorrelated random numbers in parallel.
Usage
multirandom(n) : si.bus(n)
Where:
n
: the number of decorrelated random numbers in parallel
(no.)multinoise
Generates multiple decorrelated noises in parallel.
Usage
multinoise(n) : si.bus(n)
Where:
n
: the number of decorrelated random numbers in parallel
(no.)noises
TODO.
(no.)pink_noise
Pink noise (1/f noise) generator (third-order approximation)
pink_noise
is a standard Faust function.
Usage
pink_noise : _;
Reference:
(no.)pink_noise_vm
Multi pink noise generator.
Usage
pink_noise_vm(N) : _;
Where:
N
: number of latched white-noise processes to sum, not to exceed sizeof(int) in C++ (typically 32).
References
- http://www.dsprelated.com/showarticle/908.php
- http://www.firstpr.com.au/dsp/pink-noise/#Voss-McCartney
(no.)lfnoise
, (no.)lfnoise0
and (no.)lfnoiseN
Low-frequency noise generators (Butterworth-filtered downsampled white noise).
Usage
lfnoise0(rate) : _; new random number every int(SR/rate) samples or so
lfnoiseN(N,rate) : _; same as "lfnoise0(rate) : lowpass(N,rate)" [see filters.lib]
lfnoise(rate) : _; same as "lfnoise0(rate) : seq(i,5,lowpass(N,rate))" (no overshoot)
Example
(view waveforms in faust2octave):
rate = SR/100.0; new random value every 100 samples (SR from music.lib)
process = lfnoise0(rate), sampled/held noise (piecewise constant)
lfnoiseN(3,rate), lfnoise0 smoothed by 3rd order Butterworth LPF
lfnoise(rate); lfnoise0 smoothed with no overshoot
(no.)sparse_noise_vm
sparse noise generator.
Usage
sparse_noise(f0) : _;
Where:
f0
: average frequency of noise impulses per second
Random impulses in the amplitude range -1 to 1 are generated at an average rate of f0 impulses per second.
Reference
- See velvet_noise
(no.)velvet_noise_vm
velvet noise generator.
Usage
velvet_noise(amp,f0) : _;
Where:
amp
: amplitude of noise impulses (positive and negative)f0
: average frequency of noise impulses per second
Reference
- Matti Karjalainen and Hanna Jarvelainen, "Reverberation Modeling Using Velvet Noise", in Proc. 30th Int. Conf. Intelligent Audio Environments (AES07), March 2007.
(no.)gnoise
approximate zero-mean, unit-variance Gaussian white noise generator.
Usage
gnoise(N) : _;
Where:
N
: number of uniform random numbers added to approximate Gaussian white noise
Reference
- See Central Limit Theorem