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<h1 class="page_title">chrome.experimental.speechInput</h1>
<div id="toc">
<h2>Contents</h2>
<ol>
<li>
<a href=#manifest>Manifest</a>
</li>
<li>
<a href=#howToStart>How to start speech recognition</a>
</li>
<li>
<a href=#howToGetResults>How to get speech recognition results</a>
</li>
<li>
<a href=#howToStop>How to stop recording</a>
</li>
<li>
<a href=#otherFeatures>Other features</a>
</li>
<li>
<a href=#examples>Examples</a>
</li>
<li>
<a href="#apiReference">API reference: chrome.experimental.speechInput</a>
<ol>
<li><a href="#types">Types</a><ol> <li> <a href="#type-SpeechInputStartOptions">SpeechInputStartOptions</a> </li> <li> <a href="#type-SpeechInputError">SpeechInputError</a> </li> <li> <a href="#type-SpeechInputResultHypothesis">SpeechInputResultHypothesis</a> </li> <li> <a href="#type-SpeechInputResultEvent">SpeechInputResultEvent</a> </li></ol></li>
<li><a href="#methods">Methods</a><ol> <li><a href="#method-start">start</a></li> <li><a href="#method-stop">stop</a></li> <li><a href="#method-isRecording">isRecording</a></li></ol></li>
<li><a href="#events">Events</a><ol> <li><a href="#event-onError">onError</a></li> <li><a href="#event-onSoundStart">onSoundStart</a></li> <li><a href="#event-onSoundEnd">onSoundEnd</a></li> <li><a href="#event-onResult">onResult</a></li></ol></li>
<li><a href="#samples">Sample Extensions</a></li>
</ol>
</li>
</ol>
</div>
<p id="classSummary">
The <code>chrome.experimental.speechInput</code> module provides
one-shot speech recognition to Chrome extensions.
This module is still experimental. For information on how to use experimental
APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page.
</p>
<h2 id="manifest">Manifest</h2>
<p>You must declare the "experimental" permission in the <a
href="manifest.html">extension manifest</a> to use the speech input
API.
For example:</p>
<pre>{
"name": "My extension",
...
<b>"permissions": [
"experimental"
]</b>,
...
}</pre>
<h2 id="howToStart">How to start speech recognition</h2>
<p>To start recognizing speech an extension must call the <code>start()</code>
method. If provided, your callback will be called once recording has
successfully started. In case of error <code>chrome.extension.lastError</code>
will be set.</p>
<p>This API provides exclusive access to the default recording device to the
first extension requesting it. Consequently, any calls to <code>start()</code>
when the device is being used by another extension or web page will fail and set
<code>chrome.extension.lastError</code>. The message <code>requestDenied</code>
will be set if another extension in the same profile is making use of the API.
Otherwise <code>noRecordingDeviceFound</code>, <code>recordingDeviceInUse</code>
or <code>unableToStart</code> will be set depending on the situation.</p>
<p>To check whether recording is currently active, call the
<code>isRecording()</code> method. Please note that it only checks for audio
recording within Chrome.</p>
<h2 id="howToGetResults">How to get speech recognition results</h2>
<p>Listen to the <code>onResult</code> event to receive speech recognition
results.</p>
<pre>
var callback = function(result) { ... };
chrome.experimental.speechInput.onResult.addListener(callback);
</pre>
<p>The <code>result</code> object contains an array of
<a href="#type-SpeechInputResultHypothesis">SpeechInputResultHypothesis</a>
sorted by decreasing likelihood.</p>
<p>Recording automatically stops when results are received. It is safe to call
<code>start()</code> again from the results callback.</p>
<p>To handle errors during speech recognition listen for the
<code>onError</code> event.</p>
<pre>
var callback = function(error) { ... };
chrome.experimental.speechInput.onError.addListener(callback);
</pre>
</p>Recording will automatically stop in case of error.
It is safe to call <code>start()</code> again from the error callback.</p>
<h2 id="howToStop">How to stop recording</h2>
<p>To stop speech recognition call the <code>stop()</code> method. If provided,
the callback function will be called once recording has successfully stopped.
In case of error <code>chrome.extension.lastError</code> will be set.
</p>
<h2 id="otherFeatures">Other features</h2>
<ul><li>
<code>onSoundStart</code> - Event generated when start of sound is detected
(from previously being silent).
</li><li>
<code>onSoundEnd</code> - Event generated when end of sound is detected (a
continued period of silence).
</li></ul>
<h2 id="examples">Examples</h2>
<p>The following example illustrates how to show a JavaScript alert with the
most likely recognition result.</p>
<pre>
function checkStart() {
if (chrome.extension.lastError) {
alert("Couldn't start speech input: " + chrome.extension.lastError.message);
}
}
function recognitionFailed(error) {
alert("Speech input failed: " + error.code);
}
function recognitionSucceeded(result) {
alert("Recognized '" + result.hypotheses[0].utterance + "' with confidence " + result.hypotheses[0].confidence);
}
chrome.experimental.speechInput.onError.addListener(recognitionFailed);
chrome.experimental.speechInput.onResult.addListener(recognitionSucceeded);
chrome.experimental.speechInput.start({ "language": "en" }, checkStart);
</pre>
<h2 id="apiReference">API Reference: chrome.experimental.speechInput</h2>
<div class="api_reference">
<h3 id="types">Types</h3>
<div>
<h3 id="type-SpeechInputStartOptions">SpeechInputStartOptions</h3>
<div>
<dt><span class="type_name"> ( <span id="typeTemplate">object</span> )</span></dt>
<dd>
Object describing the options used for speech recognition.
</dd> <h4 id="SpeechInputStartOptions-properties">
Properties of <a href="#type-SpeechInputStartOptions">SpeechInputStartOptions</a>
</h4>
<dd><dl> <div>
<a name="property-SpeechInputStartOptions-language"></a>
<dt>
<span class="variable">language</span>
<span class="property">
(
<span class="optional">optional</span>
<span id="typeTemplate">string</span>
)
</span>
</dt>
<dd>
BCP-47 language code of the language to recognize. When set to 'auto' or not defined defaults to user's most preferred content language. Will use 'en-US' if not supported or invalid.
</dd>
</div>
<div>
<a name="property-SpeechInputStartOptions-grammar"></a>
<dt>
<span class="variable">grammar</span>
<span class="property">
(
<span class="optional">optional</span>
<span id="typeTemplate">string</span>
)
</span>
</dt>
<dd>
Name of the grammar to use. Defaults to 'builtin:dictation'.
</dd>
</div>
<div>
<a name="property-SpeechInputStartOptions-filterProfanities"></a>
<dt>
<span class="variable">filterProfanities</span>
<span class="property">
(
<span class="optional">optional</span>
<span id="typeTemplate">boolean</span>
)
</span>
</dt>
<dd>
Enable or disable profanity filtering. Will use the default Chrome filtering settings if not set.
</dd>
</div>
</dl></dd>
</div>
</div>
<div>
<h3 id="type-SpeechInputError">SpeechInputError</h3>
<div>
<dt><span class="type_name"> ( <span id="typeTemplate">object</span> )</span></dt>
<dd>
Object describing a speech input error.
</dd> <h4 id="SpeechInputError-properties">
Properties of <a href="#type-SpeechInputError">SpeechInputError</a>
</h4>
<dd><dl> <div>
<a name="property-SpeechInputError-code"></a>
<dt>
<span class="variable">code</span>
<span class="property">
(
<span id="typeTemplate">enumerated string ["noSpeechHeard", "noResults", "captureError", "networkError"]</span>
)
</span>
</dt>
<dd>
Code identifying the error case.
</dd>
</div>
</dl></dd>
</div>
</div>
<div>
<h3 id="type-SpeechInputResultHypothesis">SpeechInputResultHypothesis</h3>
<div>
<dt><span class="type_name"> ( <span id="typeTemplate">object</span> )</span></dt>
<dd>
Object describing a speech recognition hypothesis.
</dd> <h4 id="SpeechInputResultHypothesis-properties">
Properties of <a href="#type-SpeechInputResultHypothesis">SpeechInputResultHypothesis</a>
</h4>
<dd><dl> <div>
<a name="property-SpeechInputResultHypothesis-utterance"></a>
<dt>
<span class="variable">utterance</span>
<span class="property">
(
<span id="typeTemplate">string</span>
)
</span>
</dt>
<dd>
Text of this hypothesis.
</dd>
</div>
<div>
<a name="property-SpeechInputResultHypothesis-confidence"></a>
<dt>
<span class="variable">confidence</span>
<span class="property">
(
<span id="typeTemplate">double</span>
)
</span>
</dt>
<dd>
Confidence of the hypothesis. Rated from 0 (lowest) to 1 (highest).
</dd>
</div>
</dl></dd>
</div>
</div>
<div>
<h3 id="type-SpeechInputResultEvent">SpeechInputResultEvent</h3>
<div>
<dt><span class="type_name"> ( <span id="typeTemplate">object</span> )</span></dt>
<dd>
Object containing the recognition results.
</dd> <h4 id="SpeechInputResultEvent-properties">
Properties of <a href="#type-SpeechInputResultEvent">SpeechInputResultEvent</a>
</h4>
<dd><dl> <div>
<a name="property-SpeechInputResultEvent-hypotheses"></a>
<dt>
<span class="variable">hypotheses</span>
<span class="property">
(
<span class="optional">optional</span>
<span id="typeTemplate">array of <a href="experimental.speechInput.html#type-SpeechInputResultHypothesis">SpeechInputResultHypothesis</a></span>
)
</span>
</dt>
<dd>
Array of zero or more objects describing the stable candidate hypotheses sorted by decreasing likelihood.
</dd>
</div>
</dl></dd>
</div>
</div>
<h3 id="methods">Methods</h3>
<div>
<h4 id="method-start">start</h4>
<div class="summary lower">
<span>chrome.experimental.speechInput.start</span>(<span class="optional"><a href="experimental.speechInput.html#type-SpeechInputStartOptions">SpeechInputStartOptions</a> <span class="variable">options</span></span>)
</div>
<div class="description">
<p>
Request to start recording as a new speech recognition session.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-start-options"></a> <dt> <span class="variable">options</span> <span class="property"> ( <span class="optional">optional</span> <span id="typeTemplate"><a href="experimental.speechInput.html#type-SpeechInputStartOptions">SpeechInputStartOptions</a></span> ) </span> </dt> <dd> Options used for this speech recognition session. </dd></div>
</dl>
<h4>Callback function</h4><p> If you specify the <em>callback</em> parameter, it should specify a function that looks like this:</p><pre>function() <span class="subdued">{...}</span>;</pre><dl> </dl>
</div>
</div>
<div>
<h4 id="method-stop">stop</h4>
<div class="summary lower">
<span>chrome.experimental.speechInput.stop</span>()
</div>
<div class="description">
<p>
Request to stop an ongoing speech recognition session.
</p> </div>
</div>
<div>
<h4 id="method-isRecording">isRecording</h4>
<div class="summary lower">
<span>chrome.experimental.speechInput.isRecording</span>()
</div>
<div class="description">
<p>
Determine if audio recording is currently in process in Chrome, not limited to this API.
</p> </div>
</div>
<h3 id="events">Events</h3>
<div>
<h4 id="event-onError">onError</h4>
<div class="summary">
<span class="subdued">chrome.experimental.speechInput.</span>onError<span class="subdued">.addListener</span>(function(<span><a href="experimental.speechInput.html#type-SpeechInputError">SpeechInputError</a> <span class="variable">error</span></span>)<span class="subdued"> {...}</span>);
</div>
<div class="description">
<p>
Called in case of an error in speech recognition.
</p> <h4>Listener Parameters</h4>
<dl>
<div> <a name="property-onError-error"></a> <dt> <span class="variable">error</span> <span class="property"> ( <span id="typeTemplate"><a href="experimental.speechInput.html#type-SpeechInputError">SpeechInputError</a></span> ) </span> </dt> <dd> Error being reported. </dd></div>
</dl>
</div>
</div>
<div>
<h4 id="event-onSoundStart">onSoundStart</h4>
<div class="summary">
<span class="subdued">chrome.experimental.speechInput.</span>onSoundStart<span class="subdued">.addListener</span>(function()<span class="subdued"> {...}</span>);
</div>
<div class="description">
<p>
Called when the system starts detecting sound in the input data.
</p> </div>
</div>
<div>
<h4 id="event-onSoundEnd">onSoundEnd</h4>
<div class="summary">
<span class="subdued">chrome.experimental.speechInput.</span>onSoundEnd<span class="subdued">.addListener</span>(function()<span class="subdued"> {...}</span>);
</div>
<div class="description">
<p>
Called when the system detects enough silence to consider the ongoing speech has ended.
</p> </div>
</div>
<div>
<h4 id="event-onResult">onResult</h4>
<div class="summary">
<span class="subdued">chrome.experimental.speechInput.</span>onResult<span class="subdued">.addListener</span>(function(<span><a href="experimental.speechInput.html#type-SpeechInputResultEvent">SpeechInputResultEvent</a> <span class="variable">event</span></span>)<span class="subdued"> {...}</span>);
</div>
<div class="description">
<p>
Called when speech recognition results are available.
</p> <h4>Listener Parameters</h4>
<dl>
<div> <a name="property-onResult-event"></a> <dt> <span class="variable">event</span> <span class="property"> ( <span id="typeTemplate"><a href="experimental.speechInput.html#type-SpeechInputResultEvent">SpeechInputResultEvent</a></span> ) </span> </dt> <dd> Object containing the speech recognition results. </dd></div>
</dl>
</div>
</div>
</div>
<h2 id="samples">Sample Extensions that use chrome.experimental.speechInput</h2>
<li><strong><a href="samples.html#00294fafee1df479cc20247741f44447">Speech Recognizer</a></strong> –
Recognizes your speech and tells you the most likely result.
</li>
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