@hecto/signal

Deterministic typed-array DSP kernels for FFTs, windows, filters, convolution, resampling, and spectral analysis.

pnpm add @hecto/signal

import { analysis, biquad } from '@hecto/signal'

const input = new Float32Array(128)
const output = new Float32Array(input.length)
const coefficients = biquad.design({
  kind: 'lowpass',
  freq: 1800,
  q: 0.9,
  sampleRate: 44_100,
})

biquad.process(input, coefficients, biquad.state(), output)
const level = analysis.rms(output)

Hot-path APIs accept caller-owned output buffers, state, and reusable plans so allocation is explicit.

Output views must not overlap input or state views unless an API documents in-place operation. window.apply, biquad.process, and onepole.process accept the exact input view as output; window weights stay disjoint from output. Partial overlaps are rejected before any samples or state change. Caller buffers must not alias reusable-plan storage. The FFT transforms operate in place, and rfftInto and irfftInto copy through their plans' scratch storage. Other buffer-writing operations require disjoint views.

Documentation