21
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 (51 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 ...


22
Kun Lin, Jonathan Mayer, James Martin Nohrden: Dynamic volume control system. Crystal Semiconductor Corporation, Peter Rutowski, Ken J Koestner, Skjerven Morrill MacPherson Franklin & Friel, July 11, 2000: US06088461 (50 worldwide citation)

A dynamic volume control system in an audio processor uses gain and delay signals from a digital signal processor to dynamically control the user-selected volume of the audio processor. The digital signal processor executes audio signal processing operations that affect the gain applied to the audio ...


23
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 ...


24
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 ...


25
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 ...


26
Michael A Gerzon: Audio signal processor providing simulated source distance control. Trifield Productions, Baker & Daniels, September 10, 1996: US05555306 (47 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 ...


27
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 (44 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 ...


28
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, ...


29
Blackmer David E: Compander with control signal logarithmically related to the instantaneous rms value of the input signal. January 29, 1974: US3789143 (40 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 ...


30
Paul F Bruney: Apparatus and method for enhanced psychoacoustic imagery using asymmetric cross-channel feed. Sci Coustics, Cushman Darby & Cushman, January 22, 1985: US04495637 (40 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 ...



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