@synthlet/impulse

A single-sample impulse on every trigger, as an audio worklet

Part of Synthlet.

One parameter, one job: on each rising edge of trigger it writes a single sample of 1 and is silent everywhere else. A gate turned into an event — the excitation for a resonator, a click track, or the ping that starts a @synthlet/karplus-strong string.

Install

npm i @synthlet/impulse

Or npm i synthlet for every module at once.

Usage

import { registerImpulseWorklet, Impulse } from "@synthlet/impulse";

const ac = new AudioContext();
await registerImpulseWorklet(ac);

const impulse = Impulse(ac, { trigger: clock.gate });
impulse.connect(ac.destination);

Parameters

| Param | Default | Range | Rate | Meaning | | --------- | ------- | ----- | ------ | ----------------------------- | | trigger | 0 | 0 … 1 | a-rate | Rising edge emits one impulse |

trigger is a-rate, and here that changes what is detectable: at k-rate the processor read one sample per block, so a pulse that rose and fell inside a render quantum produced no impulse at all — not a late one, none. It now fires, and a trigger arriving mid-block is seen in that block.

The impulse is still written at index 0 of the block. That is deliberate: the spec samples a k-rate AudioParam at the first sample-frame of each quantum, so an impulse written anywhere else would be invisible to a native AudioParam a caller left k-rate. What stopped being quantised is the detection, not the placement — so two rising edges inside one block still yield one impulse.

License

MIT © danigb