Patent ID: 8249515

Claim:
A mobile communication device, comprising: a main body; a communication unit adapted to establish a connection between the mobile communication device and another communication device, and generating a starting signal when the connection between the mobile communication device and the another communication device is established; an earpiece of the mobile communication device configured to rotate with respect to the main body, the earpiece adapted to receive audio signals from the another communication device through the communication unit of the mobile communication device, and outputting the audio signals so that a user of the mobile communication device can hear audio corresponding to the audio signals; a mouthpiece adapted to collect ambient sound of the mobile communication device, and determine an ambient noise level according to the collected ambient sound in response to the starting signal; a comparison unit adapted to determine whether the ambient noise level obtained by the mouthpiece is equal to a predetermined value, and generate a first driving signal when it is determined that the ambient noise level obtained by the mouthpiece is not equal to the predetermined value; and a first driver adapted to drive the earpiece to rotate in response to the first driving signal.