SpeechRecognition.continuous

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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The continuous property of the SpeechRecognition interface controls whether continuous results are returned for each recognition, or only a single result.

It defaults to single results (false.)

Syntax

var myContinuous = mySpeechRecognition.continuous;
mySpeechRecognition.continuous = true;

Value

A Boolean representing the current SpeechRecognition's continuous status. true means continuous, and false means not continuous (single result each time.)

Examples

This code is excerpted from our Speech color changer example.

var grammar = '#JSGF V1.0; grammar colors; public <color> = aqua | azure | beige | bisque | black | blue | brown | chocolate | coral | crimson | cyan | fuchsia | ghostwhite | gold | goldenrod | gray | green | indigo | ivory | khaki | lavender | lime | linen | magenta | maroon | moccasin | navy | olive | orange | orchid | peru | pink | plum | purple | red | salmon | sienna | silver | snow | tan | teal | thistle | tomato | turquoise | violet | white | yellow ;'
var recognition = new SpeechRecognition();
var speechRecognitionList = new SpeechGrammarList();
speechRecognitionList.addFromString(grammar, 1);
recognition.grammars = speechRecognitionList;
//recognition.continuous = false;
recognition.lang = 'en-US';
recognition.interimResults = false;
recognition.maxAlternatives = 1;

...

Note that continuous currently isn't implemented on Gecko, and you just single results with each recognition. For now, you can roughly emulate continuous results by just running SpeechRecognition.start() each time a result is detected, like this:

recognition.onresult = function(event) {
    ...
  recognition.start();
}

Specifications

Specification Status Comment
Web Speech API
The definition of 'continuous' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 33 [1] No support No support No support No support
Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
Basic support (Yes) (Yes)[1] ? No support No support No support No support
  • [1] Speech recognition interfaces are currently prefixed in Chrome, so you'll need to prefix interface names appropriately, e.g. webkitSpeechRecognition; You'll also need to serve your code through a web server for recognition to work.

Firefox OS permissions

To use speech recognition in an app, you need to specify the following permissions in your manifest:

"permissions": {
  "audio-capture" : {
    "description" : "Audio capture"
  },
  "speech-recognition" : {
    "description" : "Speech recognition"
  }
}

You also need a privileged app, so you need to include this as well:

  "type": "privileged"

See also

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