Macromedia flash media server 2-client-side actionscript language reference for flash media server 2 Benutzerhandbuch

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Client-Side ActionScript Language Reference
silenceTimeOut_nstep.addEventListener("change", nstepListener);
this.onEnterFrame = function() {
    silenceLevel_pb.setProgress(active_mic.activityLevel, 100);
};
active_mic.onActivity = function(active:Boolean) {
    if (active) {
    silenceLevel_pb.indeterminate = false;
    silenceLevel_pb.setStyle("themeColor", "haloGreen");
    silenceLevel_pb.label = "Activity level: %3";
    } else {
    silenceLevel_pb.indeterminate = true;
    silenceLevel_pb.setStyle("themeColor", "0xFF0000");
    silenceLevel_pb.label = "Activity level: (inactive)";
    }
};
The 
MovieClip.getNextHighestDepth()
 method used in this example requires Flash Player 
7 or later. If your SWF file includes a v2 component (version 2 of the Macromedia 
Component Architecture), use the DepthManager class from the component framework 
instead of the 
MovieClip.getNextHighestDepth()
 method. 
See also
Microphone.useEchoSuppression
Availability
Flash Player 6.
Flash Media Server (not required).
Usage
public useEchoSuppression : Boolean [read-only]
Description
Property (read-only); a Boolean value of 
true
 if echo suppression is enabled; otherwise, 
false
. The default value is 
false
 unless the user has selected Reduce Echo in the Flash Player 
Microphone Settings panel.