@audio/resample-sinc

Windowed-sinc resampling — high quality, anti-aliased (SoX rate / libsamplerate class)

Windowed-sinc (Lanczos, a = 16) resampling: 32 taps, widened by the ratio on downsample (64 at 2:1), so the kernel itself is the anti-alias lowpass. Flat within 0.01 dB to 0.8 of the lower Nyquist (+0.1 dB at 0.9), no delay; aliases −39 dB just past Nyquist, −62 dB from 1.36× Nyquist up (swept, 2:1 and 3:1).

import sinc, { sincRead, resampleTo } from '@audio/resample-sinc'

sinc(data, { from: 44100, to: 48000 })   // → Float32Array

sinc(data: Float32Array, opts: {from, to}) → Float32Array — sample rates in Hz.

sincRead(data, pos) / resampleTo(data, n) — fractional-position read and fixed-output-length primitives, for custom resampling loops.

phases(from, to): the weights sinc() reads at integer rates, one row per phase, for streaming forms that must give its samples.

Install

npm i @audio/resample-sinc