@audio/eq-parametric

import parametricEq from '@audio/eq-parametric'

Free-form multi-band EQ — any number of bands, each independently peaking, low-shelf, or high-shelf, each with its own fc/Q/gain. One RBJ biquad per band, cascaded in array order.

let params = { bands: [
  { fc: 100, type: 'lowshelf', gain: 2 },
  { fc: 3000, Q: 1.4, gain: -4 },       // type omitted → 'peak'
], fs: 44100 }
for (let buf of stream) parametricEq(buf, params)

Pass the same params object across successive calls — the filter cascade is cached on it; a change of any band's fc/Q/gain/type or fs by value rebuilds only the coefficients and each band's state carries over, so state continues across block boundaries and automation is click-free.

Use when: general-purpose multi-band corrective or creative EQ — mixing-channel EQ, mastering surgical cuts, anywhere a fixed band layout (graphic) or two-knob tone stack (baxandall/tilt) is too rigid.

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

MIT © audiojs