1
Peter G Craven, Michael A Gerzon: Compensating filters. Nixon & Vanderhye P C, September 29, 1998: US05815580 (67 worldwide citation)

A prefilter (5) for an audio system comprising a loudspeaker (1) in a room (2), which corrects both amplitude and phase errors due to the loudspeaker (1) by a linear phase correction filter response and corrects the amplitude response of the room (2) whilst introducing the minimum possible amount of ...


2
Michael A Gerzon: Sound reproduction system having a matrix converter. Trifield Productions, Baker & Daniels, January 14, 1997: US05594800 (60 worldwide citation)

Matrix reproduction decoding means derive from input signals intended to feed a stereophonic plurality of loudspeakers output signals intended to feed a second greater plurality of loudspeakers in a stereophonic arrangement covering a sector of directions, substantially so as to preserve total repro ...


3
Michael A Gerzon: Audio signal processor providing simulated source distance control. Trifield Productions, Baker & Daniels, September 10, 1996: US05555306 (56 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 ...


4
Peter G Craven, Michael A Gerzon: Lossless coding method for waveform data. Dolby Laboratories Licensing Corporation, Sughrue Mion PLLC, December 16, 2003: US06664913 (51 worldwide citation)

In a method of lossless processing of an integer value signal in a prediction filter which includes a quantiser, a numerator of the prediction filter is implemented prior to the quantiser and a denominator of the prediction filter is implemented recursively around the quantiser to reduce the peak da ...


5
Peter G Craven, Michael A Gerzon: Compensating filters. Nixon & Vanderhye, April 23, 1996: US05511129 (42 worldwide citation)

A prefilter (5) for an audio system comprising a loudspeaker (1) in a room (2), which corrects both amplitude and phase errors due to the loudspeaker (1) by a linear phase correction filter response and corrects the amplitude response of the room (2) whilst introducing the minimum possible amount of ...


6
Peter G Craven, Michael A Gerzon: Lossless coding method for waveform data. Dolby Laboratories Licensing Corporation, David N Lathrop Esq, Gallagher & Lathrop, August 31, 2004: US06784812 (27 worldwide citation)

In a method of lossless processing of an integer value signal in a prediction filter which includes a quantiser, a numerator of the prediction filter is implemented prior to the quantiser and a denominator of the prediction filter is implemented recursively around the quantiser to reduce the peak da ...


7
Peter G Craven, Michael A Gerzon: Compensating filters. Nixon & Vanderhye P C, May 6, 1997: US05627899 (22 worldwide citation)

A prefilter (5) for an audio system comprising a loudspeaker (1) in a room (2), which corrects both amplitude and phase errors due to the loudspeaker (1) by a linear phase correction filter response and corrects the amplitude response of the room (2) whilst introducing the minimum possible amount of ...


8
Michael A Gerzon: Sound reproduction systems. National Research Development Corporation, Cushman Darby & Cushman, April 24, 1979: US04151369 (11 worldwide citation)

A basic decoder designed to feed signals to at least three loudspeakers disposed at respective azimuths around a reference point at equal distances therefrom is modified to make it suitable for feeding loudspeakers at the same azimuths but at non-uniform distances from the reference point. Each outp ...


9
Michael A Gerzon: Decoders for feeding irregular loudspeaker arrays. National Research Development Corporation, Young & Thompson, November 8, 1983: US04414430 (10 worldwide citation)

A decoder is provided for feeding an irregular array of m (being three or more) pairs of diametrically opposite loudspeakers, each loudspeaker being disposed at an equal distance r from a common reference point. The decoder incorporates a WXY circuit 10 for producing output signals W, X, Y and -jW f ...


10
Michael A Gerzon: Sound reproduction system with matrixing of power amplifier outputs. National Research Development Corporation, Cushman Darby & Cushman, February 13, 1979: US04139729 (2 worldwide citation)

In a surround sound reproduction system the required number of power amplifiers is reduced by effecting at least part of the decoding operation by the manner in which the various loudspeakers are connected to the outputs of the power amplifiers while preserving linear independence of the signals fed ...