Motorola I686 ユーザーズマニュアル

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main attractions
dual microphone noise 
cancellation
The Dual Microphone Noise Cancellation 
feature improves call audio quality by 
removing ambient noise around you. It 
provides a cleaner clearer sound to the person 
you are calling.
Note: Dual Microphone Noise Cancellation is 
turned on by default. Covering the noise 
cancellation microphone, located right next to 
the camera, may result in poor audio quality.
To turn off the Dual Microphone Noise 
Cancellation feature, press / > 
u
 > 
Phone Calls > Noise Cancellation > Off.
To activate the feature, select On instead of Off.