1
Duane H Cooper, Jerald L Bauck: Head diffraction compensated stereo system with loud speaker array. Welsh & Katz, July 26, 1994: US05333200 (63 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 acoustics while retaining relative independence of listener movement. The system first utilizes a synthetic or artificial head micr ...


2
Duane H Cooper, Jerald L Bauck: Head diffraction compensated stereo system with optimal equalization. Welsh & Katz, March 20, 1990: US04910779 (51 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 ...


3
Duane H Cooper: Signal matrixing for directional reproduction of sound. National Research Development Corporation, Cushman Darby & Cushman, November 25, 1980: US04236039 (33 worldwide citation)

Multidirectional sound signals are optimally matrixed to increase the psychoacoustic directional fidelity as compared with prior systems. Four (or more) azimuthally spaced loudspeakers are fed from two transmission channels with very satisfactory directional sensing accuracy and full compatibility w ...


4
Duane H Cooper, Jerald L Bauck: Head diffraction compensated stereo system. Welsh & Katz, August 4, 1992: US05136651 (30 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 acoustics while retaining relative independence of listener movement. The system first utilizes a synthetic or artificial head micr ...


5
Duane H Cooper, Jerald L Bauck: Head diffraction compensated stereo system with optimal equalization. Welsh & Katz, December 4, 1990: US04975954 (29 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 acoustics while retaining relative independence of listener movement. The system first utilizes a synthetic or artificial head micr ...


6
Duane H Cooper, Jerald L Bauck: Head diffraction compensated stereo system. Welsh & Katz, July 23, 1991: US05034983 (29 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 acoustics while retaining relative independence of listener movement. The system first utilizes a synthetic or artificial head micr ...


7
Duane H Cooper, Jerald L Bauck: Head diffraction compensated stereo system. Welsh & Katz, January 9, 1990: US04893342 (27 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 acoustics while retaining relative independence of listener movement. The system first utilizes a synthetic or artificial head micr ...


8
Duane H Cooper: Multichannel matrix logic and encoding systems. Fitch Even & Tabin, April 10, 1979: US04149031 (15 worldwide citation)

Apparatus and methods relating to "quadrasonic" encoding and decoding systems, including synthetic supplementary channel systems, matrix logic systems, and systems employing stereo compatible matrix variations.


9
Duane H Cooper: Monaural and stereo compatible multidirectional sound matrixing. Fitch Even Tabin & Luedeka, July 20, 1976: US03970788 (8 worldwide citation)

Multidirectional source signals which are encoded in two monaural and stereo-compatible transmission channels with predetermined amplitude and phase relations indicative of source directions and adapted to be decoded for formation of more than two loudspeaker presentation signals having source signa ...


10
Duane H Cooper: Synthetic supplementary channel matrix decoding systems. Fitch Even Tabin & Luedeka, April 18, 1978: US04085291 (7 worldwide citation)

Apparatus and methods relating to "quadrasonic" encoding and decoding systems, including synthetic supplementary channel systems, matrix logic systems, and systems employing stereo compatible matrix variations.