Flash CS3 Documentation

Programming ActionScript 3.0 > Working with sound > Capturing sound input > Altering microphone audio

Altering microphone audio

Your application can alter the audio data that comes from a microphone in two ways. First, it can change the gain of the input sound, which effectively multiplies the input values by a specified amount to create a louder or quieter sound. The Microphone.gain property accepts numeric values between 0 and 100 inclusive. A value of 50 acts like a multiplier of one and specifies normal volume. A value of zero acts like a multiplier of zero and effectively silences the input audio. Values above 50 specify higher than normal volume.

Your application can also change the sample rate of the input audio. Higher sample rates increase sound quality, but they also create denser data streams that use more resources for transmission and storage. The Microphone.rate property represents the audio sample rate measured in kilohertz (kHz). The default sample rate is 8 kHz. You can set the Microphone.rate property to a value higher than 8 kHz if your microphone supports the higher rate. For example, setting the Microphone.rate property to a value of 11 sets the sample rate to 11 kHz; setting it to 22 sets the sample rate to 22 kHz and so on.

Flash CS3