@audio/auditory-gammatone

Gammatone auditory filter — 4th-order cochlear model, in-place

npm install @audio/auditory-gammatone

import gammatone from '@audio/auditory-gammatone'

Cochlear-model bandpass: a cascade of complex one-pole filters (order stages, default 4) with pole bandwidth b = 2π*1.019*ERB(fc) (Patterson et al., "Complex sounds and auditory images", Auditory Physiology and Perception, 1992), gain-normalized so the response is 0 dB at fc.

Processor, NOT a design function — unlike Bark/ERB/mel/octave in this family, gammatone takes and returns an audio buffer: gammatone(data, params), matching the filter/eq family's fn(data, params) in-place convention. Pick fc per band from @audio/auditory-erb's output, or call directly with a known center frequency.

gammatone(data, { fc: 1000, fs: 44100 })       // single band, in-place

let params = { fc: 1000, fs: 44100, order: 4 }
gammatone(chunk1, params)
gammatone(chunk2, params)                      // continues chunk1's filter state

| Param | Default | | |---|---|---| | fc | 1000 | Center frequency Hz | | fs | 44100 | Sample rate Hz | | order | 4 | Cascade order — number of one-pole stages |

Gain normalization and pole state are cached on params (_-prefixed fields) across calls — reuse the same params object across chunks for a continuous stream; pass a fresh object to reset state.

Use when: filtering actual audio through a single cochlear-model band, e.g. one band picked from auditory-erb's output. For computing a whole bank's layout, see auditory-bark/auditory-erb/auditory-mel/auditory-octave instead.

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

MIT © audiojs