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Class Information
Number: 381/71.1
Name: Electrical audio signal processing systems and devices > Acoustical noise or sound cancellation
Description: Subject matter, not elsewhere classifiable, comprising a noise cancellation system where audible noise is at least partially eliminated by generating and acoustically emitting an out-of-phase replica of an offending sound.










Sub-classes under this class:

Class Number Class Name Patents
381/71.2 Acoustic, nonairborne vibration sensing or counterwave emission 135
381/71.6 Adjacent ear 243
381/71.8 Counterwave generation control path 133
381/71.3 From appliance 84
381/71.7 Particular transducer or enclosure structure 175
381/71.4 Within cabin or compartment of vehicle 217
381/71.5 Within duct 174


Patents under this class:
1 2 3 4 5 6 7 8 9 10

Patent Number Title Of Patent Date Issued
8712069 Selection of system parameters based on non-acoustic sensor information Apr. 29, 2014
8712070 Simultaneous enhancement of transmission loss and absorption coefficient using activated cavities Apr. 29, 2014
8693699 Method for adaptive control and equalization of electroacoustic channels Apr. 8, 2014
8693700 Adaptive feed-forward noise reduction Apr. 8, 2014
8693701 Audio device Apr. 8, 2014
8693704 Method and apparatus for canceling noise from mixed sound Apr. 8, 2014
8682250 Noise cancellation system Mar. 25, 2014
8682006 Noise suppression based on null coherence Mar. 25, 2014
8682000 Method and device for narrow-band noise suppression in a vehicle passenger compartment Mar. 25, 2014
8682018 Microphone array with rear venting Mar. 25, 2014
8675885 Adjusting noise reduction in headphones Mar. 18, 2014
8676571 Audio signal processing system and audio signal processing method Mar. 18, 2014
8670571 Frequency control based on device properties Mar. 11, 2014
8660281 Method and system for a multi-microphone noise reduction Feb. 25, 2014
8649530 Method and apparatus for canceling non-uniform radiation patterns in array speaker system Feb. 11, 2014
8649526 Noise reduction circuit and method therefor Feb. 11, 2014
8644522 Method and system for modeling external volume changes within an acoustic echo canceller Feb. 4, 2014
8644521 Adaptive noise control system with secondary path estimation Feb. 4, 2014
8644496 Echo suppressor, echo suppressing method, and computer readable storage medium Feb. 4, 2014
8638952 Signal processing apparatus and signal processing method Jan. 28, 2014
8630424 Active noise control system and method Jan. 14, 2014
8630425 Apparatus, system, and method for audio communications Jan. 14, 2014
8625812 Acoustic dampening compensation system Jan. 7, 2014
8626502 Improving speech intelligibility utilizing an articulation index Jan. 7, 2014
8620010 Loudspeaker device Dec. 31, 2013
8611553 ANR instability detection Dec. 17, 2013
8611552 Direction-aware active noise cancellation system Dec. 17, 2013
8611551 Low latency active noise cancellation system Dec. 17, 2013
8596279 Offset stem for earplug and earplug formed therewith Dec. 3, 2013
8600037 Audio quality and double talk preservation in echo control for voice communications Dec. 3, 2013
8600069 Multi-channel active noise control system with channel equalization Dec. 3, 2013
8600087 Hearing apparatus and method for reducing an interference noise for a hearing apparatus Dec. 3, 2013
8600454 Decisions on ambient noise suppression in a mobile communications handset device Dec. 3, 2013
8594352 Active cancellation hearing assistance device Nov. 26, 2013
8594354 Hearing aid and method of estimating dynamic gain limitation in a hearing aid Nov. 26, 2013
8588865 Method and apparatus for removing acoustic incident signal Nov. 19, 2013
8588429 Sound device and sound control device Nov. 19, 2013
8577045 Apparatus and method for encoding a multi-channel audio signal Nov. 5, 2013
8577052 Headphone accessory Nov. 5, 2013
8571226 Automatic polarity adaptation for ambient noise cancellation Oct. 29, 2013
8571227 Noise cancellation earphone Oct. 29, 2013
8571230 Active noise reduction adaptive filter adaptation rate adjusting Oct. 29, 2013
8571855 Audio enhancement system Oct. 29, 2013
8565442 Noise reduction device Oct. 22, 2013
8559647 Sound emitting and collecting apparatus Oct. 15, 2013
8553898 Method and system for reducing acoustical reverberations in an at least partially enclosed space Oct. 8, 2013
8553900 Noise reduction circuit with monitoring functionality Oct. 8, 2013
8542843 Headset with integrated stereo array microphone Sep. 24, 2013
8537977 Apparatus and method for voice processing in mobile communication terminal Sep. 17, 2013
8538492 System and method for localized noise cancellation Sep. 17, 2013

1 2 3 4 5 6 7 8 9 10










 
 
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