公开(公告)号：EP0932967A1

公开(公告)日：1999-08-04

申请号：EP97911029.0

申请日：1997-10-17

Applicant: ANDREA ELECTRONICS CORPORATION

Inventor： ANDREA, Douglas

IPC: H04M1

CPC classification number: H04M1/19

Abstract: 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.

公开(公告)号：EP0792568A1

公开(公告)日：1997-09-03

申请号：EP95940696.0

申请日：1995-11-14

Applicant: ANDREA ELECTRONICS CORPORATION

Inventor： ANDREA, Douglas ,  TOPF, Martin

IPC: G10K11 ,  G10L21 ,  H04B15 ,  H04M1 ,  H04R1 ,  H04R3 ,  H04B1 ,  H04R29

CPC classification number: H04M1/6008 ,  H04B1/12 ,  H04M1/05 ,  H04M1/19 ,  H04R1/1083 ,  H04R3/005 ,  H04R3/02 ,  H04R29/006 ,  H04R2201/107 ,  H04R2201/403

Abstract: Apparatus for reducing acoustic background noise for use with a telephone handset (10) or a boom microphone device (100) or a boom headset (401) or the like. The apparatus includes first (12) and second (14) microphones which are arranged such that the first microphone (12) receives a desired speech input and the background noise present in the vicinity of the speech, and the second microphone (14) receives substantially only the background noise. The background noise from the second microphone (14) is converted into a corresponding electrical signal and substracted (16) from a signal corresponding to the speech and background noise obtained from the first microphone (12) so as to produce a signal representing substantially the speech.