The MediaTrackConstraints dictionary's echoCancellation property is a ConstrainBoolean describing the requested or mandatory constraints placed upon the value of the echoCancellation constrainable property.

If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.echoCancellation as returned by a call to MediaDevices.getSupportedConstraints(). However, typically this is unnecessary since browsers will simply ignore any constraints they're unfamiliar with.


var constraintsObject = { echoCancellation: constraint };

constraintsObject.echoCancellation = constraint;


If this value is a simple true or false, the user agent will attempt to obtain media with echo cancellation enabled or disabled as specified, if possible, but will not fail if this can't be done. If, instead, the value is given as an object with an exact field, that field's Boolean value indicates a required setting for the echo cancellation feature; if it can't be met, then the request will result in an error.


See "Example: Constraint exerciser" in Capabilities, constraints, and settings for an example.


Specification Status Comment
Media Capture and Streams
The definition of 'echoCancellation' in that specification.
Editor's Draft Initial specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 50 (50) No support (Yes) ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? (Yes) 50.0 (50) No support ? ? (Yes)

See also

Document Tags and Contributors

 Contributors to this page: Sheppy
 Last updated by: Sheppy,