MACROMEDIA FLEX-FLEX ACTIONSCRIPT LANGUAGE Reference page 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
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
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);
See also
Microphone.setGain(),
Microphone.silenceLevel
Availability
Flash Player 6.
Usage
active_mic.silenceLevel:Number
Description
Read-only property; an integer that specifies the amount of sound required to activate the
microphone and invoke
Example
The following example changes the silence level based on the user's input in a NumericStepper
instance called
silenceLevel_nstep
modifies its appearance depending on whether the audio stream is considered silent. Otherwise, it
displays the activity level of the audio stream.
. The ProgressBar instance called
Microphone.useEchoSuppression
Microphone.onActivity(true)
. The ProgressBar instance called
Microphone.setUseEchoSuppression(true)
activityLevel_pb
. The default value is 10.
Microphone.silenceLevel
displays the
silenceLevel_pb
549
if