A port of the eSpeak speech synthesizer from C++ to JavaScript using Emscripten.

Enables text-to-speech on the web using only JavaScript and HTML5.

Online demo: http://syntensity.com/static/espeak.html

Very simple! Do this:

• Include the script in your html header,

  <script src="speak.js"></script>

  (and make sure you have speak.js where it will be found)

• Add a div with an audio element called 'audio' in your html body,

  <div id="audio"></div>

• Call speak() to say stuff in JavaScript

  speak('hello world!')

See demo.min.html for a simple 'hello world', and demo.full.html for a more detailed example.

You can also specify some options with calling speak(), by doing

  `speak('hello world', { option1: value1, option2: value2 .. })`

available options are:

• amplitude: How loud the voice will be (default: 100)
• pitch: The voice pitch (default: 50)
• speed: The speed at which to talk (words per minute) (default: 175)
• voice: Which voice to use (requires you to bundle it - currently you wil need to build speak.js yourself for that) (default: en/en-us)
• wordgap: Additional gap between words in 10 ms units (default: 0)

For example

  `speak('hello world', { pitch: 100 })`

will talk in a very high-pitched voice.

A prebuilt version is already included, in the file speak.js. But if you want to tinker with the source code though, you might want to build it yourself. To do so, run emscripten.sh inside src/. Note that you need to change the paths there.

That will generate speak.full.js, which is the unminified version. It is recommended to minify that (for example, using the closure compiler). speak.js in this repo is minified.

demo.full.html uses speak.full.js (the unminified version) while demo.min.js uses speak.js (the minified version).