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


(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