{"json_modified": "2016-10-18T17:06:15.590096", "uuid": "8a8495dc-278a-45b1-ab83-2f5990426e2b", "title": "MediaTrackConstraints.echoCancellation", "url": "/en-US/docs/Web/API/MediaTrackConstraints/echoCancellation", "tags": ["API", "MediaTrackConstraints", "WebRTC", "echoCancellation", "Reference", "Constraints", "Property", "Media Streams API", "Media Capture and Streams API", "Media"], "translations": [], "modified": "2016-10-18T17:06:15", "label": "MediaTrackConstraints.echoCancellation", "localization_tags": [], "locale": "en-US", "id": 196719, "last_edit": "2016-10-18T17:06:08", "summary": "The <a href=\"/en-US/docs/Web/API/MediaTrackConstraints\" title=\"The MediaTrackConstraints dictionary is used to describe a set of capabilities and the value or values each can take on. A constraints dictionary is passed into applyConstraints() to allow a script to establish a set of exact (required) values or ranges and/or preferred values or ranges of values for the track, and the most recently-requested set of custom constraints can be retrieved by calling getConstraints().\"><code>MediaTrackConstraints</code></a> dictionary's <code><strong>echoCancellation</strong></code> property is a <a href=\"/en-US/docs/Web/API/ConstrainBoolean\" title=\"The ConstrainBoolean dictionary is used to specify a constraint for a property whose value is a Boolean value. You can specify an exact value which must be matched, an ideal value that should be matched if at all possible, and a fallback value to attempt to match once all more specific constraints have been applied.\"><code>ConstrainBoolean</code></a> describing the requested or mandatory constraints placed upon the value of the <a href=\"/en-US/docs/Web/API/MediaTrackSettings/echoCancellation\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>echoCancellation</code></a> constrainable property.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Value", "title": "Value"}, {"id": "Example", "title": "Example"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "slug": "Web/API/MediaTrackConstraints/echoCancellation", "review_tags": []}