The Microphone Class; Avoiding Audio Feedback; Keeping The Microphone On - MACROMEDIA FLASH MEDIA SERVER 2-DEVELOPING MEDIA Develop Manual

The Microphone class

This section includes recommendations for optimizing your use of the Microphone class,
including tips on avoiding audio feedback.

Avoiding audio feedback

If you're using a microphone with external speakers and a reasonably high gain, you're likely to
incur audio feedback problems. To reduce feedback from speakers, Flash Media Server uses
echo suppression, which you can implement by using the following command:
my_mic.useEchoSuppression(true);
This should maintain a comfortable input level without transmitting too much echo from
your speakers.
Because echo suppression removes only a portion of the output signal from the user's input,
you might still experience feedback if your microphone is too close to your speaker. To avoid
feedback, try following these guidelines:
Lower your speaker volume.
Move the microphone and speakers farther apart.
Troubleshoot your hardware setup for proper installation and settings.
Use a headset.

Keeping the microphone on

To save bandwidth, Flash Media Server by default turns off the microphone when it is not
being used. However, you might want to keep it on in your application—for example, to
ensure that there is no delay when the microphone is activated. To keep the microphone on,
use the following command:
my_mic.setSilenceLevel(0).
48 Using Media Classes