@audio/synth-chirp

Frequency sweep — exp/linear

npm install @audio/synth-chirp

import chirp from '@audio/synth-chirp'

Frequency sweep generator. Exponential (log) sweep is the ESS measurement signal (Farina 2000, used by @audio/measure-ir); linear sweep is for response plots. Instantaneous frequency: linear f(t) = f0 + (f1-f0)·t/T, exponential f(t) = f0·(f1/f0)^(t/T). Unpitched — single opts argument, edges fade to avoid clicks.

chirp({ f0: 20, f1: 20000, duration: 1, method: 'exp' })   // → Float32Array

| Param | Default | | |---|---|---| | f0 | 20 | Start frequency, Hz | | f1 | fs/2 · 0.95 | End frequency, Hz | | duration | 1 | Seconds | | method | 'exp' | 'exp' or 'lin' | | amp | 0.9 | Peak amplitude | | fade | 0.005 | Edge fade, seconds (anti-click) | | fs | 44100 | Sample rate |

Use when: measuring an impulse response (ESS deconvolution) or sweeping a filter/effect for a Bode-style plot.

Part of @audio/synth — the synth family umbrella.

MIT © audiojs