dual microphones can be used to improve noise suppression by better distinguishing between speech and background noise . if the user does not hold the handset according to a prescribed orientation , however , the dual microphone noise suppression can actually do a worse job than a single microphone noise suppression algorithm because of mistakes made distinguishing between speech and noise . here it is proposed to use an accelerometer to determine the orientation of the phone and use this orientation information in the noise suppression algorithm . also when a person speaks , the vibrations when the device is held against the head can be used to detect speech .