Noise cancelling acoustical improvement to a communications device

• US 6,108,415 A
• Filed: 10/17/1997
• Issued: 08/22/2000
• Est. Priority Date: 10/17/1996
• Status: Expired due to Term

• Current Assignee: Andrea Electronics Corporation
• Original Assignee: Andrea Electronics Corporation
• Inventors: Andrea, Douglas
• Primary Examiner(s): WEAVER, SCOTT LOUIS
• Application Number:
  US08/953,021
• Time in Patent Office: 1,040 Days
• Field of Search: 379/387, 379/419, 379/428, 379/433, 455/570, 455/90, 381/157, 381/158, 381/159, 381/169, 381/181, 381/304, 381/305, 381/344, 381/355, 381/356, 381/357, 381/359
• US Class Current: 379/433.03
• CPC Class Codes: H04M 1/19 Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor circuit arrangements for preventing eavesdropping H04M1/68; telephone cabinets E04H1/14

Abstract

A cellular telephone for reducing background noise comprising a housing having a receiver portion and a speaker portion; the receiver portion having a voice port and a noise port; a microphone isolator located within the receiver portion; at least one noise canceling microphone having a front end and a back end enclosed by the microphone isolator; an windscreen placed in front of the microphone and internally behind the voice port; and an acoustical port to permit a pressure gradient noise porting placed at the back end of the microphone and internally behind the noise port.

Claims

1. A communications device with a noise canceling acoustical improvement for reducing background noise comprising:

a housing having a receiver portion and a speaker portion;

said receiver potion having a voice port and a noise port;

a microphone isolator located within said receiver portion, said microphone isolator being sized for optimum microphone coupling to minimize noise;

at least one noise canceling microphone having a front end and a back end enclosed by said microphone isolator;

a windscreen placed in front of the microphone and internal to said receiver portion behind said voice port;

an acoustical baffle located inside said receiver portion behind said voice port; and

an acoustical opening located at the back end of the microphone and internal to said receiver portion behind the noise port, so that ambient noise is mechanically canceled from the noise received with the received speech.

2. The communications device of claim 1, wherein the at least one noise canceling microphone is a pressure gradient microphone.

3. The communications device of claim 1, wherein said windscreen is comprised of an acoustical baffling arrangement incorporated as a structural member of said housing.