21
Michael A Gerzon: Audio signal processor providing simulated source distance control. Trifield Productions, Baker & Daniels, September 10, 1996: US05555306 (52 worldwide citation)

An audio signal processing system produces an output 24 having an illusory distance effect for a sound source signal S by feeding it via a direct signal path 25 and an indirect signal path 22, 23 passing through early reflection simulation apparatus 1 which feed an output mixing mechanism 9. A contr ...


22
Gregory Kramer: Digital signal processor for providing timbral change in arbitrary audio and dynamically controlled stored digital audio signals. Yield Securities, Brooks Haidt Haffner & Delahunty, February 5, 1991: US04991218 (52 worldwide citation)

A digital audio signal processing technique in which the harmonic content of the output signal varies with the amplitude of an input signal. The preferred embodiment includes an analog to digital converter with sample and hold, a digital signal memory with playback control apparatus, timing circuits ...


23
Tae hwa Jeong: Score evaluation display device for an electronic song accompaniment apparatus. Samsung Electronics, Sughrue Mion Zinn Macpeak & Seas, July 18, 1995: US05434949 (51 worldwide citation)

A score evaluation display device for an electronic song accompaniment apparatus has an audio signal processing unit to evaluate a user's singing. A sampling processor samples the difference between an input song signal from a microphone and reference song signal, a volume deference detector detects ...


24
Duane H Cooper, Jerald L Bauck: Head diffraction compensated stereo system with optimal equalization. Welsh & Katz, March 20, 1990: US04910779 (50 worldwide citation)

A stereo audio processing system for a stereo audio signal processing reproduction that provides improved source imaging and simulation of desired listening environment accoustics while retaining relative independence of listener movement. The system first utilizes a synthetic or artificial head mic ...


25
Seiji Higurashi: Magnetic recording and/or reproducing apparatus having means for preventing audio-to-video crosstalk and noise generation. Victor Company of Japan, Michael N Meller, November 5, 1991: US05063452 (47 worldwide citation)

A magnetic recording apparatus comprising an audio signal processing circuit for converting an input analog audio signal into a digital audio signal; a modulating circuit for subjecting the digital audio signal to a modulation selected from a multi-phase differential phase shift keying modulation (D ...


26
Kiyofumi Inanaga, Hiroyuki Sogawa, Yasuhiro Iida, Yabe Susumu: Audio signal reproducing apparatus. Sony Corporation, Hill Steadman & Simpson, February 27, 1996: US05495534 (47 worldwide citation)

In the audio signal reproducing apparatus, information on the transfer characteristics representative of the transfer characteristics from virtual sound sources to both ears of a listener in at least a first quadrant of the rotational angular position of the head M of the listener is stored in stori ...


27
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 (45 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 ...


28
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 ...


29
Robert H Langford: Audio signal processing system. Beveridge De Grandi Kline & Lunsford, January 15, 1980: US04184047 (43 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 ...


30
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 (42 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, ...



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