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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
4476572 Partition system for open plan office spaces Oct. 9, 1984
4473906 Active acoustic attenuator Sep. 25, 1984
4450321 Circuit for producing noise generation for sound masking May. 22, 1984
4438526 Automatic volume and frequency controlled sound masking system Mar. 20, 1984
4395600 Auditory subliminal message system and method Jul. 26, 1983
4352039 Sonic transducer Sep. 28, 1982
4319088 Method and apparatus for masking sound Mar. 9, 1982
4280019 Combination acoustic conditioner and light fixture Jul. 21, 1981
4185167 Sound masking package Jan. 22, 1980
4082918 Audio analgesic unit Apr. 4, 1978
4059726 Process and apparatus for speech privacy improvement through incoherent masking noise sound generation in open-plan office spaces and the like Nov. 22, 1977
4054751 Masking noise generator Oct. 18, 1977
4052564 Masking sound generator Oct. 4, 1977
4052720 Dynamic sound controller and method therefor Oct. 4, 1977
4031320 Sound producing device Jun. 21, 1977
4010324 Background noisemasking system Mar. 1, 1977
3985957 Sound masking system for open plan office Oct. 12, 1976
3980827 Diversity system for noise-masking Sep. 14, 1976

1 2 3 4

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