dahdit

Fast WebAssembly-based Morse code generator for browsers.

Installation

npm install dahdit

Usage

import { generateMorseAudio, playMorseAudio, ready } from 'dahdit';

// Wait for WebAssembly to load (recommended)
await ready;

// Generate audio data
const audio = generateMorseAudio({
  text: "HELLO WORLD [SOS]",
  wpm: 20,
  frequency: 440,
  volume: 0.5
});

// Play in browser
playMorseAudio(audio);

API

generateMorseAudio(params)

Generates Morse code audio data.

Parameters:

• text (string) - Text to convert to Morse code
• wpm (number, optional) - Words per minute (default: 20)
• sampleRate (number, optional) - Audio sample rate (default: 22050)
• frequency (number, optional) - Tone frequency in Hz (default: 440)
• volume (number, optional) - Volume 0.0-1.0 (default: 0.5)

Returns: Audio data object with audioData, sampleRate, and duration properties.

playMorseAudio(audioResult)

Plays audio data using Web Audio API.

Parameters:

• audioResult - Object returned from generateMorseAudio()

Returns: AudioBufferSourceNode for controlling playback.

ready

Promise that resolves when WebAssembly module is loaded.

Prosigns

Use [brackets] for prosigns like [SOS], [AR], [SK]. These run letters together without normal inter-character spacing.

Learn more: Prosigns for Morse code