noise

A noise generator. Three flavours.

Signature

noise(kind: string)               -> Signal   // unbounded; runs forever in an ambient
noise(kind: string, duration_s)   -> Signal   // bounded

• kind — one of:
  • "white" — uniform random in [-1, 1), flat spectrum.
  • "pink" — pseudo-pink via a three-band integrator approximation. Close enough to true pink for ambient layers; not for measurement.
  • "brown" — integrated white, clamped to ±1. Heavy low-frequency content; useful for ocean rumble.
• duration_s — length of the resulting buffer, in seconds.

Example

let hiss   = noise("white", 0.5).gain(0.1);
let ambient = noise("pink", 8.0).gain(0.3);
let rumble  = noise("brown", 12.0).gain(0.6);

Errors

• noise: unknown kind 'foo' — expected 'white', 'pink', or 'brown'

Determinism caveat

The current implementation uses a fixed PRNG seed shared across all noise(...) calls in an evaluation. Two calls in the same script share state, which means re-evaluating produces identical buffers but the relative sequences between two noise calls in the same script are not independent.

This is good enough for game ambience but worth knowing. A future change will seed per-patch(...) so noise within different patches is statistically independent, and a seed: int parameter will let the caller pin it explicitly.