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

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Microphone class
53
Returns
Nothing.
Description
Method; sets the rate, in kHz, at which the microphone should capture sound.
Example
The following example sets the microphone rate to the user’s preference (which you have 
assigned to the 
userRate
 variable) if it is one of the following values: 5, 8, 11, 22, or 44. If it 
is not, the value is rounded to the nearest acceptable value that the sound capture device 
supports.
active_mic.setRate(userRate);
See also
Microphone.setSilenceLevel()
Availability
Flash Player 6.
Flash Media Server (not required).
Usage
public setSilenceLevel(silenceLevel:Number, [timeOut:Number]) : Void
Parameters
silenceLevel
  An integer that specifies the amount of sound required to activate the 
microphone and invoke 
Microphone.onActivity(true)
. Acceptable values range from 0 
to 100. The default value is 10.
timeOut
  An optional integer parameter that specifies how many milliseconds must elapse 
without activity before Flash considers sound to have stopped and invokes 
Microphone.onActivity(false)
. The default value is 2000 (2 seconds).
Returns
Nothing.