Acer TravelMate 6231 - Manual (Page 51)

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Audio
The system provides you whole new enthusiastic audio experience including
Acer PureZone with two built-in stereo microphones featuring beam forming
and echo cancellation technologies. The computer also comes with 32-bit Intel
High Definition (HD) Audio, and dual stereo speakers.
Adjusting the volume
Adjusting the volume on the computer is as easy as pressing some buttons. See
"Hotkeys" on page 30 for more information on adjusting the speaker volume.
Acer PureZone
Acer PureZone technology supports Acoustic Echo Cancellation, Beam Forming
and Noise Suppression for pure sound recording.
To set up your microphone, run the Acer HD Audio Manager by double-clicking
the Acer HD Audio Manager icon in the system tray of your Windows system.
The Acer HD Audio Manager dialog box will pop up.
Click the Microphone tab, and then click the Microphone Effects tab. Select
Beam Forming and Acoustic Echo Canellation to set the microphone effect.
Note: Disable the beam forming to get the multi-sound source
input.