31
Peter M Kuhn: Video/audio signal processing method and video-audio signal processing apparatus. Sony Corporation, Frommer Lawrence & Haug, William S Frommer, Paul A Levy, April 8, 2008: US07356082 (46 worldwide citation)

A metadata extraction unit has a feature point selection and motion estimation unit 62 for extracting at least one feature point representing characteristics of the video/audio signals in a compressed domain of the video/audio signals. Thus, reduction of time or cost for processing can be realized a ...


32
Richard Sidney Stroud, Gary Michael McQuilling: Audio signal processing circuit for reducing noise in an audio signal. Delphi Technologies, Stefan V Chmielewski, October 19, 2004: US06807280 (45 worldwide citation)

An audio signal processing circuit reduces noise in an incoming audio signal and is particularly useful in telephone communication systems utilizing one or more hands-free microphones. A preferred embodiment of the audio signal processing circuit includes a pre-emphasis circuit receiving the audio s ...


33
Robert H Langford: Audio signal processing system. Beveridge De Grandi Kline & Lunsford, January 15, 1980: US04184047 (44 worldwide citation)

An audio signal processing system for enhancing audio signals such as music by providing reverberation, generation of stereophonic or quadraphonic effects, chorusing, flanging, pitch change, vibrato and various combinations of these effects. An audio signal is passed through a compressor, to increas ...


34
Kiyoshi Tateishi: Method of reproducing high-speed audio data by a CD-ROM player. Pioneer Electronic Corporation, Sughrue Mion Zinn Macpeak & Seas, May 30, 1995: US05420839 (43 worldwide citation)

A method of performing a reproduction of a high-speed audio data in a CD-ROM player comprises the steps of; reading EFM demodulated data from the disk at a high speed, writing the thus read data one after the other into a CD-ROM data storage as an input buffer of an audio signal processing section, ...


35
Blackmer David E: Compander with control signal logarithmically related to the instantaneous rms value of the input signal. January 29, 1974: US3789143 (42 worldwide citation)

A compander system for audio signal processing, in which two 90.degree. phase separated signals are generated from an input audio signal. Each phase separated signal is processed through a converter which provides an output signal logarithmically related to the instantaneous rms value of the corresp ...


36
Seefeldt Alan Jeffrey: Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal. Dolby Laboratories Licensing Corporation, Seefeldt Alan Jeffrey, GALLAGHER Thomas A, October 25, 2007: WO/2007/120453 (42 worldwide citation)

Audio signal processing relating to the measurement and control of the perceived sound loudness and/or the perceived spectral balance of an audio signal is useful, for example, in one or more of: loudness-compensating volume control, automatic gain control, dynamic range control (including, for exam ...


37
Paul F Bruney: Apparatus and method for enhanced psychoacoustic imagery using asymmetric cross-channel feed. Sci Coustics, Cushman Darby & Cushman, January 22, 1985: US04495637 (41 worldwide citation)

Enhanced pyschoacoustic imagery is achieved in an audio signal processing circuit for processing plural channels of related audio signals. Asymmetric bi-directional audio signal cross-feed is established between first and second audio signal processing channels, for example. The cross-fed signal com ...


38
Timothy J Van Hook, Howard H Cheng, Anthony P DeLaurier, Carroll P Gossett, Robert J Moore, Stephen J Shepard, Harold S Anderson, John Princen, Jeffrey C Doughty, Nathan F Pooley, Byron Sheppard, Genyo Takeda, Shuhei Kato: High performance low cost video game system with coprocessor providing high speed efficient 3D graphics and digital audio signal processing. Nintendo, Silicon Graphics, Nixon & Vanderhye P C, April 29, 2003: US06556197 (40 worldwide citation)

A low cost high performance three dimensional (3D) graphics system is disclosed that can model a world in three dimensions and project the model onto a two dimensional viewing plane selected based on a changeable viewpoint. The viewpoint can be changed on an interactive, real time basis by operating ...


39
Zoran Cvetkovic: Nonuniform oversampled filter banks for audio signal processing. AT&T, Henry Brendzel, February 7, 2006: US06996198 (38 worldwide citation)

A non-uniform filter bank is created by joining sections of oversampled uniform filter bands that are based on complex exponential modulation (as opposed to cosine modulation). Each filter bank handles a given, non-overlapping frequency band. The bands are not of uniform bandwidth, and the filters o ...


40
Steven S O Connell: Software sound synthesis system. Invision Interactive, Philip M Shaw Jr, Limbach & Limbach L, January 21, 1997: US05596159 (36 worldwide citation)

An audio signal processing system including an input circuit for inputting musical instrument digital interface (MIDI) commands in real time over a plurality of channels, a computer including a central processing unit (CPU) supplied with the MIDI commands for simultaneously synthesizing one or more ...



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