High-Pass

Attenuates frequencies below the cutoff, letting the highs through. Useful for removing low-frequency rumble, thinning out a mix, or isolating vocals and high-pitched elements.

Usage

import { Sound, AudioFilters } from '@motion-script/core';

// Via AudioFilters builder — remove everything below 200 Hz
const clip = new Sound({ src: './voice.mp3', filters: AudioFilters.highpass(200) });

// With resonance boost at the cutoff
const clip = new Sound({ src: './voice.mp3', filters: AudioFilters.highpass({ frequency: 300, q: 2 }) });

// Via raw object
const clip = new Sound({ src: './voice.mp3', filters: [{ type: 'highpass', frequency: 200 }] });

Props

Prop	Type	Default	Description
`type`	`'highpass'`	–	Filter identifier
`frequency`	`number`	–	Cutoff frequency in Hz. Content below this is rolled off
`q`	`number`	`1`	Resonance (Q factor) at the cutoff. Higher values add a peak just before the roll-off

Animating

Sweep the cutoff frequency to create a filter-open effect:

import { Sound, AudioFilters, tween, lerpNumber } from '@motion-script/core';

const clip = new Sound({ src: './music.mp3', filters: AudioFilters.highpass(2000) });
clip.start();

// Sweep cutoff from 2000 Hz down to 80 Hz over 3 seconds
yield* tween(3, (t) => {
  clip.set({ filters: AudioFilters.highpass(lerpNumber(2000, 80, t)) });
});

Notes

A Q of 1 gives a gentle Butterworth-style roll-off. Values above 5 create a noticeable resonant peak that can be used as a creative effect.
High-pass and low-pass filters can be chained to form a band-pass: AudioFilters.highpass(200).lowpass(3000).
Both frequency and q are fully animatable.