User Guide

Microphone.silenceLevel 549

Generally, echo suppression is advisable when the sound being captured is played through

speakers—instead of a headset—on the same computer. If your SWF file allows users to specify

the sound output device, you may want to call

Microphone.setUseEchoSuppression(true) if

they indicate they are using speakers and will be using the microphone as well.

Users can also adjust these settings in the Flash Player Microphone Settings panel.

Example

The following example turns on echo suppression if the user selects a CheckBox instance called

useEchoSuppression_ch. The ProgressBar instance called activityLevel_pb displays the

current activity level of the audio stream.

var useEchoSuppression_ch:mx.controls.CheckBox;

var activityLevel_pb:mx.controls.ProgressBar;

this.createEmptyMovieClip("sound_mc", this.getNextHighestDepth());

var active_mic:Microphone = Microphone.get();

sound_mc.attachAudio(active_mic);

activityLevel_pb.mode = "manual";

activityLevel_pb.label = "Activity Level: %3";

useEchoSuppression_ch.selected = active_mic.useEchoSuppression;

this.onEnterFrame = function() {

activityLevel_pb.setProgress(active_mic.activityLevel, 100);

};

var chListener:Object = new Object();

chListener.click = function(evt:Object) {

active_mic.setUseEchoSuppression(evt.target.selected);

};

useEchoSuppression_ch.addEventListener("click", chListener);