Asus M2N-SLI Deluxe - Manual (Page 140)

-2 Chapter : Software support
Enhanced Microphone Features
Voice recording
Enables Noise Filter function. Detects repetitive and stationary noises like
computer fans, air conditioners, and other background noises then eliminates
it in the incoming sudio stream while recording. You can enable it for a better
recording quality.
Directional Array
Receives only the sound coming from the reception cone and eliminates
interferences including neighboring speakers and reverberations. You can
enable it to transit clearer sound during on-line games, MSN, or Skype.
Speaker Phone
Advanced de-reverberation techniques can help to reduce echo and minimize
its effect on the speech engine. You can enable it when you have conference
call to reduce echoes in the other side.
The directional Array and Speaker Phone works
only with the ASUS Array Nic.