watson-html5-speech-recognition

A Library to provide speech recognition capability in browsers.

Support

The library enables speech recognition support for any browser that includes support for either:

• Web Speech API or
• Web Audio API + getUserMedia support

If the browser does not support either of the above, then currently you're out of luck.

watson-html5-speech-recognition use Web Speech API when present and Watson Speech To Text service for all other (supported) cases.

Currently, the following are supported:

• Webkit speech recognition
  • Chrome (33)
  • FireFox (>=44)
• Watson Speech to Text
  • Microsoft Edge
  • Firefox (<44)
  • Opera

Prequisites

1. An instance of Watson Speech To Text Service (requires a Bluemix account)
2. Watson Speech to Text Websocket server (provided. see Example section below)

Install

npm install watson-html5-speech-recognition

Usage

var Speech = require('watson-html5-speech-recognition');
var speech = new Speech.SpeechToText();

speech.listen({
    onStart: function() {
        console.log('starting');
    },
    onResult: function(e) {
        console.log(e.text);
    },
    onError: function(e) {
        console.log('error', e);
    },
    onEnd: function(e) {
        console.log('end', e);
    }
});

Customized Usage

If Watson speech services are engaged, the watson-html5-speech-recognition request a token from the server then communicates via websocket.

By default, watson-html5-speech-recognition assumes the token endpoint exists at /api/speech-to-text/token. If you alter the location of that endpoint, you must supply the new location via a configuration parameter upon instantiation. Like so...

var Speech = require('watson-html5-speech-recognition');
var speech = new Speech.SpeechToText({
  watsonTokenUrl: `/path/to/my/speech-to-text/token`
});

NOTE: The example server uses the watson-developer-cloud npm package to configure the token endpoint (see example/server/stt-token.js).

Example

The example contains a simple web front end, along with a backend web socket server that communicates with the Watson Speech To Text service

Setup the example

Clone the example:

git clone https://github.com/cdimascio/watson-html5-speech-recognition

Navigate to the example root:

cd example/server

Install dependencies:

npm install

Build the example:

npm compile

Run the example:

First, be sure to complete all steps in the section above, "Setup the example"

Then,

Open stt-token.js to line 10

Set '<your-username>' and '<your-username>' to match your Watson Speech To Text Service credentials.

npm start

Try it:

• Navigate to http://localhost:3000
• Click the 'mic' button
• Speak

License

Apache 2.0