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Class Information
Number: 381/73.1
Name: Electrical audio signal processing systems and devices > Sound or noise masking
Description: Subject matter which utilizes sound to reduce the distractive influences of unwanted sound or other audible noise.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
6577745 Watermark detection Jun. 10, 2003
6539095 Audio watermarking to convey auxiliary control information, and media embodying same Mar. 25, 2003
6466752 Method of improving sound quality and image formation apparatus Oct. 15, 2002
6351222 Method and apparatus for receiving an input by an entertainment device Feb. 26, 2002
6259792 Waveform playback device for active noise cancellation Jul. 10, 2001
6188771 Personal sound masking system Feb. 13, 2001
6164408 Plenum mounted, flat panel masking loudspeaker system and method for mounting a masking loudspeaker in a ceiling plenum Dec. 26, 2000
6119805 Hearing protector adaptable to chair Sep. 19, 2000
6047074 Programmable hearing aid operable in a mode for tinnitus therapy Apr. 4, 2000
5960037 Encoding of a plurality of information signals Sep. 28, 1999
5930557 Noise masking system and method in image forming apparatus Jul. 27, 1999
5912821 Vibration/noise control system including adaptive digital filters for simulating dynamic characteristics of a vibration/noise source having a rotating member Jun. 15, 1999
5872853 Noise abatement device Feb. 16, 1999
5834647 Active device for attenuating the sound intensity Nov. 10, 1998
5784670 Noise masking system and method in image forming apparatus Jul. 21, 1998
5784300 Methods, apparatus and systems for real time identification and control modes of oscillation Jul. 21, 1998
5781640 Adaptive noise transformation system Jul. 14, 1998
5774559 Method and apparatus for determining perceived roughness of powertrain sounds Jun. 30, 1998
5754973 Methods and apparatus for replacing missing signal information with synthesized information and recording medium therefor May. 19, 1998
5687285 Noise reducing method, noise reducing apparatus and telephone set Nov. 11, 1997
RE35574 Communication device apparatus and method utilizing pseudonoise signal for acoustical echo cancellation Jul. 29, 1997
5625745 Noise imaging protection for multi-channel audio signals Apr. 29, 1997
5559893 Method and device for active noise reduction in a local area Sep. 24, 1996
5473699 Vehicle internal noise reduction system Dec. 5, 1995
5455779 Noise reduction apparatus Oct. 3, 1995
5386689 Active gas turbine (jet) engine noise suppression Feb. 7, 1995
5386472 Active noise control system Jan. 31, 1995
5360469 Apparatus for air filtration and sound masking Nov. 1, 1994
5327496 Communication device, apparatus, and method utilizing pseudonoise signal for acoustical echo cancellation Jul. 5, 1994
5295192 Electronic noise attenuation method and apparatus for use in effecting such method Mar. 15, 1994
5293578 Noise reducing device Mar. 8, 1994
5245666 Personal subliminal messaging system Sep. 14, 1993
5243661 Microphone apparatus Sep. 7, 1993
5237618 Electronic compensation system for elimination or reduction of inter-channel interference in noise cancellation systems Aug. 17, 1993
5224864 Method of recording and reproducing subliminal signals that are 180 degrees out of phase Jul. 6, 1993
5197098 Secure conferencing system Mar. 23, 1993
5192342 Apparatus for enhancing the environmental quality of work spaces Mar. 9, 1993
5170381 Method for mixing audio subliminal recordings Dec. 8, 1992
5159703 Silent subliminal presentation system Oct. 27, 1992
5131047 Noise suppressor Jul. 14, 1992
5058173 Combination inertia type audio transducer and loudspeaker Oct. 15, 1991
5036542 Audio surveillance discouragement apparatus and method Jul. 30, 1991
4914706 Masking sound device Apr. 3, 1990
4887299 Adaptive, programmable signal processing hearing aid Dec. 12, 1989
4852175 Hearing aid signal-processing system Jul. 25, 1989
4829729 Anti-eavesdropping window structure May. 16, 1989
4777529 Auditory subliminal programming system Oct. 11, 1988
4686693 Remotely controlled sound mask Aug. 11, 1987
4677677 Active sound attenuation system with on-line adaptive feedback cancellation Jun. 30, 1987
4674124 Multichannel masking sound generator Jun. 16, 1987

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