Flash CS3 Documentation

Programming ActionScript 3.0 > Working with sound > Capturing sound input > Routing microphone audio to local speakers

Routing microphone audio to local speakers

Audio input from a microphone can be routed to the local system speakers by calling the Microphone.setLoopback() method with a parameter value of true.

When sound from a local microphone is routed to local speakers, there is a risk of creating an audio feedback loop, which can cause loud squealing sounds and can potentially damage sound hardware. Calling the Microphone.setUseEchoSuppression() method with a parameter value of true reduces, but does not completely eliminate, the risk that audio feedback will occur. Adobe recommends you always call Microphone.setUseEchoSuppression(true) before calling Microphone.setLoopback(true), unless you are certain that the user is playing back the sound using headphones or something other than speakers.

The following code shows how to route the audio from a local microphone to the local system speakers:

var mic:Microphone = Microphone.getMicrophone();
mic.setUseEchoSuppression(true);
mic.setLoopBack(true);

Flash CS3