@audio/auditory-mel

Mel-frequency triangular filter bank

npm install @audio/auditory-mel

import melBank from '@audio/auditory-mel'

nFilters+2 points equally spaced on the mel scale mel(f) = 2595*log10(1 + f/700) (O'Shaughnessy, "Speech Communications: Human and Machine", IEEE Press, 2000) between fmin/fmax, each band a triangle over three consecutive points — the classic MFCC front-end bank.

Design function, not a stream processor: melBank(fs, opts) → bands. Positional fs first — a deliberate divergence from the filter/eq family's fn(data, params) in-place convention. No buffer in, no buffer out — it returns triangle descriptors, not biquad coefficients; apply the triangular weights yourself against a magnitude spectrum.

melBank(44100)                                    // 26 mel filters, defaults
melBank(16000, { nFilters: 40, fmax: 8000 })       // MFCC-style 40-filter bank

| Param | Default | | |---|---|---| | fmin | 0 | Lowest band edge Hz | | fmax | fs/2 | Highest band edge Hz | | nFilters | 26 | Number of mel filters |

Use when: MFCC/speech-recognition feature-extraction front-ends, or any mel-scale spectral binning.

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

MIT © audiojs