31
Blackmer David E: Compander with control signal logarithmically related to the instantaneous rms value of the input signal. January 29, 1974: US3789143 (41 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 ...


32
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 ...


33
Abhijit Kulkarni: Audio signal processing. Bose Corporation, Fish & Richardson P C, February 10, 2009: US07490044 (39 worldwide citation)

An audio system for processing two channels of audio input to provide more than two output channels. The input may be conventional stereo material or compressed audio signal data. The audio processing includes separating the input signals into frequency bands and processing the frequency bands accor ...


34
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 (39 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 ...


35
Zoran Cvetkovic: Nonuniform oversampled filter banks for audio signal processing. AT&T, Henry Brendzel, February 7, 2006: US06996198 (37 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 ...


36
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 ...


37
Tanaka Yoshiaki, Fuchigami Norihiko, Ueno Shoji: Recording medium and audio-signal processing apparatus. Fujitsu, January 20, 1999: EP0892404-A2 (36 worldwide citation)

A digital signal recording disc has a first area and a second area. The second area differs from the first area. The first area stores a first-channel digital audio signal and a second-channel digital audio signal. The first-channel digital audio signal results from quantizing a first-channel analog ...


38
Makio Yamaki, Hiroyuki Ishihara, Norimichi Katsumura, Toshiyuki Naoe, Yukio Matsumoto, Kazuhiro Hayashi, Kazuo Watanabe: Audio signal processing system having independent and distinct data buses for concurrently transferring audio signal data to provide acoustic control. Pioneer Electronic Corporation, Foley & Lardner, June 8, 1993: US05218710 (35 worldwide citation)

An audio signal data processing system comprises input device for sequentially supplying an audio signal data, data memory control device for writing the audio signal data into a data memory and reading-out the data from the data memory, delay memory control device for sequentially reading-out the a ...


39
Mitsuyoshi Fukuda: Method and apparatus for processing audio signals. Sanyo Electric, Armstrong Westerman Hattori McLeland & Naughton, June 1, 1993: US05216718 (33 worldwide citation)

A method and an apparatus for processing audio signals with a directional emphasis by providing other channels besides the left and the right channels. An audio signal processing apparatus is divided into two blocks: a first block for processing digital signals of the left channel and the right chan ...


40
Oh Eun Mi, Kim Sang Wook, Lee Sang Jo, Kim Mi Young: Apparatus and method for processing audio signal and computer readable recording medium storing computer program for the method. Samsung Electronics, September 8, 2004: EP1455504-A2 (33 worldwide citation)

An audio signal processing apparatus and method and a computer readable recording medium storing a computer program for the method are provided. The audio signal processing apparatus includes: an input unit that receives the audio signal; and a signal processing unit that processes the audio signal ...



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