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Class Information
Number: 367/126
Name: Communications, electrical: acoustic wave systems and devices > Distance or direction finding > By combining or comparing signals > Addition or subtraction
Description: Subject matter in which the combined signal is the result of the addition or subtraction of a signal in one channel to or from, respectively, a signal in another channel.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8649244 Target searching device, target searching program, and target searching method Feb. 11, 2014
8565127 Voice-activity detection based on far-end and near-end statistics Oct. 22, 2013
8488412 Underwater detection device Jul. 16, 2013
8120993 Acoustic treatment apparatus and method thereof Feb. 21, 2012
8089827 Method for localizing remote devices, using acoustical and electromagnetic waves Jan. 3, 2012
8059487 Underwater detection device Nov. 15, 2011
7788066 Method and apparatus for improving noise discrimination in multiple sensor pairs Aug. 31, 2010
7773458 Systems and methods for detection and analysis of amplitude modulation of underwater sound Aug. 10, 2010
7449967 Probabilistic pulse generator and differential absolute value computing element and manhattan distance arithmetic unit using this Nov. 11, 2008
7272073 Method and device for generating information relating to the relative position of a set of at least three acoustic transducers Sep. 18, 2007
7149149 Acoustic flow noise cancellation using a reference hydrophone Dec. 12, 2006
6861981 Normalizing apparatus for adaptive beamforming in smart antenna receiving system Mar. 1, 2005
6559935 Sensors of relative position and orientation May. 6, 2003
6370083 Method and apparatus for detecting acoustic signals from a plurality of acoustic signal sensors Apr. 9, 2002
6069585 Personal direction finding apparatus May. 30, 2000
6002645 Self survey of random arrays Dec. 14, 1999
5729507 Directional energy receiving systems for use in the indication of the direction of arrival of the received signal Mar. 17, 1998
5675655 Sound input apparatus Oct. 7, 1997
5657393 Beamed linear array microphone system Aug. 12, 1997
5625697 Microphone selection process for use in a multiple microphone voice actuated switching system Apr. 29, 1997
5581036 Bandwidth sampling technique for digital focusing in array imaging systems Dec. 3, 1996
5581620 Methods and apparatus for adaptive beamforming Dec. 3, 1996
5392213 Filter for removal of coherent noise from seismic data Feb. 21, 1995
5333129 Acoustic imaging in the ocean using ambinet noise Jul. 26, 1994
5309409 Target detection system May. 3, 1994
5272923 Inspection apparatus Dec. 28, 1993
5214709 Hearing aid for persons with an impaired hearing faculty May. 25, 1993
5208786 Multi-channel signal separation May. 4, 1993
5043951 Apparatus for reduction of side lobes in a beam pattern of an array Aug. 27, 1991
5034931 Display detection enhancement Jul. 23, 1991
5008630 Stationary probability integrator system Apr. 16, 1991
4977545 Target detector Dec. 11, 1990
4965776 Planar end-fire array Oct. 23, 1990
4772445 System for determining DC drift and noise level using parity-space validation Sep. 20, 1988
4703506 Directional microphone apparatus Oct. 27, 1987
4630246 Seismic-acoustic low-flying aircraft detector Dec. 16, 1986
4557386 System to measure geometric and electromagnetic characteristics of objects Dec. 10, 1985
4433397 Circuit arrangement for the formation and processing of group signals Feb. 21, 1984
4414654 Thinned array transducer for sonar Nov. 8, 1983
4360795 Detection means Nov. 23, 1982
4336607 Beamformer having random access memory delay Jun. 22, 1982
4310904 Ambient sea noise elimination method and apparatus Jan. 12, 1982
4247900 Signal combiner with permuted addressing Jan. 27, 1981
4241431 Sonar ranging system Dec. 23, 1980
4233678 Serial phase shift beamformer using charge transfer devices Nov. 11, 1980
4223400 Low-frequency directional hydrophone Sep. 16, 1980
4207622 Direction-finding array of crossed dipoles Jun. 10, 1980
4203163 Target-detection and location system May. 13, 1980
4198705 Directional energy receiving systems for use in the automatic indication of the direction of arrival of the received signal Apr. 15, 1980
4180814 Multiple beam receiving array signal processor Dec. 25, 1979

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