@audio/filter-dcblocker

DC blocking filter

npm install @audio/filter-dcblocker

import dcBlocker from '@audio/filter-dcblocker'

Removes DC offset — the simplest useful filter.

$H(z) = \dfrac{1 - z^{-1}}{1 - Rz^{-1}}$

Topology: zero at $z = 1$ (DC), pole at $z = R$ Cutoff: $f_c \approx \frac{(1-R) f_s}{2\pi}$ — $R = 0.995$ gives ~35 Hz at 44.1 kHz

let params = { R: 0.995 }
dcBlocker(buffer, params)

| Param | Default | | |---|---|---| | R | 0.995 | pole radius — closer to 1 pushes the cutoff lower |

Pass the same params object on every call to persist the one-pole state across blocks.

Use when: removing DC bias before processing, preventing lowpass filter saturation.

Part of @audio/filter — the filter family umbrella. This README is generated from the umbrella docs.

MIT © audiojs