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Class Information
Number: 381/94.1
Name: Electrical audio signal processing systems and devices > Noise or distortion suppression
Description: Subject matter with provisions for reducing the effects of an unwanted signal on a desired signal.










Sub-classes under this class:

Class Number Class Name Patents
381/94.9 Feedforward circuitry for transducer compensation 37
381/94.6 Hum or ground loop 29
381/94.4 Interpolation 43
381/94.8 Peak limiting or pulsive noise compensation 94
381/94.5 Soft switching, muting, or noise gating 225
381/94.2 Spectral adjustment 271
381/94.7 Using signal channel and noise channel 229


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Patent Number Title Of Patent Date Issued
8712070 Simultaneous enhancement of transmission loss and absorption coefficient using activated cavities Apr. 29, 2014
8712073 Method and apparatus for blind signal extraction Apr. 29, 2014
8712075 Spatially pre-processed target-to-jammer ratio weighted filter and method thereof Apr. 29, 2014
8705752 Low frequency noise reduction circuit architecture for communications applications Apr. 22, 2014
8705759 Method for determining a signal component for reducing noise in an input signal Apr. 22, 2014
8706497 Speech signal restoration device and speech signal restoration method Apr. 22, 2014
8682250 Noise cancellation system Mar. 25, 2014
8682018 Microphone array with rear venting 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
8675891 Power supply unit with noise reduction capability Mar. 18, 2014
8670554 Method for encoding multiple microphone signals into a source-separable audio signal for network transmission and an apparatus for directed source separation Mar. 11, 2014
8665346 Image pickup apparatus with noise elimination Mar. 4, 2014
8666082 Utilizing information from a number of sensors to suppress acoustic noise through an audio processing system Mar. 4, 2014
8666091 Method for reducing a disturbance in an input signal caused by an output signal in a multi-port connector, multi-port connector, and mobile device Mar. 4, 2014
8655418 Method and apparatus for a frequency domain echo suppression filter Feb. 18, 2014
8654990 Multiple microphone based directional sound filter Feb. 18, 2014
8654212 Audio signal processing apparatus Feb. 18, 2014
8649530 Method and apparatus for canceling non-uniform radiation patterns in array speaker system Feb. 11, 2014
8645142 System and method for method for improving speech intelligibility of voice calls using common speech codecs Feb. 4, 2014
8644525 Virtual microphones in electronic conferencing systems Feb. 4, 2014
8644522 Method and system for modeling external volume changes within an acoustic echo canceller Feb. 4, 2014
8639502 Speaker model-based speech enhancement system Jan. 28, 2014
8634581 Method and device for estimating interference noise, hearing device and hearing aid Jan. 21, 2014
8630427 Telecommunications terminal and method of operation of the terminal Jan. 14, 2014
8626502 Improving speech intelligibility utilizing an articulation index Jan. 7, 2014
8625826 Apparatus and method for background noise estimation with a binaural hearing device supply Jan. 7, 2014
8625817 Faster cadzow denoising based on partial eigenvalue decomposition Jan. 7, 2014
8611548 Noise analysis and extraction systems and methods Dec. 17, 2013
8611551 Low latency active noise cancellation system Dec. 17, 2013
8600073 Wind noise suppression Dec. 3, 2013
8600072 Audio data processing apparatus and method to reduce wind noise Dec. 3, 2013
8600087 Hearing apparatus and method for reducing an interference noise for a hearing apparatus Dec. 3, 2013
8588430 Controlling an adaptation of a behavior of an audio device to a current acoustic environmental condition Nov. 19, 2013
8588429 Sound device and sound control device Nov. 19, 2013
8583429 System and method for single-channel speech noise reduction Nov. 12, 2013
8577052 Headphone accessory Nov. 5, 2013
8577056 Limiting peak audio power in mobile devices Nov. 5, 2013
8577057 Digital dual microphone module with intelligent cross fading Nov. 5, 2013
8577675 Method and device for speech enhancement in the presence of background noise Nov. 5, 2013
8571855 Audio enhancement system Oct. 29, 2013
8571243 Method for suppressing feedback and for spectral extension in hearing devices Oct. 29, 2013
8571231 Suppressing noise in an audio signal Oct. 29, 2013
8571230 Active noise reduction adaptive filter adaptation rate adjusting Oct. 29, 2013
8571228 Feedforward ANR device acoustics Oct. 29, 2013
8565446 Estimating direction of arrival from plural microphones Oct. 22, 2013
8565459 Signal processing using spatial filter Oct. 22, 2013
8559652 Apparatus and method for removing white noise in portable terminal Oct. 15, 2013
8559653 Multi-channel decoding systems capable of reducing noise and methods thereof Oct. 15, 2013
8526636 Click-pop noise suppression system Sep. 3, 2013

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