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Class Information
Number: 381/96
Name: Electrical audio signal processing systems and devices > Loudspeaker feedback
Description: The mechanical or electromechanical coupling of a portion of a sound wave output of a system to a preceding part or input circuit of the system.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8681997 Adaptive beamforming for audio and data applications Mar. 25, 2014
8675883 Apparatus and associated methodology for suppressing an acoustic echo Mar. 18, 2014
8675882 Sound signal processing device and method Mar. 18, 2014
8670571 Frequency control based on device properties Mar. 11, 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
8660272 Parameter setting method and audio apparatus Feb. 25, 2014
8660281 Method and system for a multi-microphone noise reduction Feb. 25, 2014
8634564 Signal processing device and method, and a program Jan. 21, 2014
8634576 Output phase modulation entrainment containment for digital filters Jan. 21, 2014
8630426 Howling suppression using echo cancellation Jan. 14, 2014
8594342 Transducer device including feedback circuit Nov. 26, 2013
8588431 Electrical system for a speaker and its control Nov. 19, 2013
8571225 Method and circuit for testing an audio high-frequency loudspeaker being part of a loudspeaker system Oct. 29, 2013
8571226 Automatic polarity adaptation for ambient noise cancellation Oct. 29, 2013
8571227 Noise cancellation earphone Oct. 29, 2013
8565441 Method and apparatus for reducing resonance of loudspeaker Oct. 22, 2013
8553899 Output phase modulation entrainment containment for digital filters Oct. 8, 2013
8538040 Drivers and methods for driving a load Sep. 17, 2013
8509450 Dynamic audibility enhancement Aug. 13, 2013
8483398 Methods and systems for reducing acoustic echoes in multichannel communication systems by reducing the dimensionality of the space of impulse responses Jul. 9, 2013
8483403 System and method for directionally radiating sound Jul. 9, 2013
8477976 Method for the detection of whistling in an audio system Jul. 2, 2013
8477952 Audio system with feedback detection means Jul. 2, 2013
8452034 Entrainment avoidance with a gradient adaptive lattice filter May. 28, 2013
8428278 Improvements to systems for acoustic diffusion Apr. 23, 2013
8401207 Motional feedback system Mar. 19, 2013
8396233 Beam forming in spatialized audio sound systems using distributed array filters Mar. 12, 2013
8345886 Method and apparatus for detecting malfunctioning speaker Jan. 1, 2013
8340317 Stereo audio-signal processing system Dec. 25, 2012
8320585 Radio with dual sided audio Nov. 27, 2012
8320574 Methods and systems for reducing acoustic echoes in communication systems Nov. 27, 2012
8300837 System and method for compensating memoryless non-linear distortion of an audio transducer Oct. 30, 2012
8300872 Method and device for detecting a displacement and movement of a sound producing unit of a woofer Oct. 30, 2012
8295519 Codebook based feedback path estimation Oct. 23, 2012
8270620 Method of performing measurements by means of an audio system comprising passive loudspeakers Sep. 18, 2012
8254588 System and method for providing step size control for subband affine projection filters for echo cancellation applications Aug. 28, 2012
8249259 Voice intelligibility enhancement system and voice intelligibility enhancement method Aug. 21, 2012
8238563 System, devices and methods for predicting the perceived spatial quality of sound processing and reproducing equipment Aug. 7, 2012
8224009 Audio system with synthesized positive impedance Jul. 17, 2012
8223991 Amplification circuit for driving a diffuser Jul. 17, 2012
8204249 Methods and systems for reducing acoustic echoes in multichannel audio-communication systems Jun. 19, 2012
8204236 Protection procedure for speaker systems Jun. 19, 2012
8204210 Method and system for nonlinear acoustic echo cancellation in hands-free telecommunication devices Jun. 19, 2012
8194869 Audio power management system Jun. 5, 2012
8189811 System and method for processing audio signals May. 29, 2012
8189809 Audio device for improved sound reproduction May. 29, 2012
8175290 Feedback reduction system May. 8, 2012
8165317 Method and system for position detection of a sound source Apr. 24, 2012
8155353 Device and method for driving speaker Apr. 10, 2012
8150052 Integrating acoustic echo cancellation as a subsystem into an existing videoconference and telepresence system Apr. 3, 2012

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