NOISE CANCELLING ACOUSTICAL IMPROVEMENT TO WIRELESS TELEPHONE OR CELLULAR PHONE

摘要

A cellular telephone (8) for reducing background noise includes a housing having a receiver portion and a speaker portion. The receiver portion has a voice port (13) and a noise port (10). A microphone isolator (9) is located within the receiver portion and at least one noise cancelling microphone (12) has a front end and back end enclosed by the microphone isolator (9). A windscreen (14) is placed in front of the microphone internally behind the voice port (13). The telephone includes an acoustical port (15) which permits a pressure gradient noise porting, placed at the back end of the microphone and internally behind the noise port.