Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Patent
1996-01-23
1997-01-14
Brinich, Stephen
Electrical audio signal processing systems and devices
Binaural and stereophonic
Quadrasonic
381 18, H04R 500
Patent
active
055948006
ABSTRACT:
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 reproduced energy to within an overall gain and equalization, and to preserve to within constants of proportionality the angular dispositions of reproduced acoustical velocity and sound intensity vectors at an ideal listening position. Preferably for two-channel signals matrix means is frequency-dependent giving increased angular width above 5 kHz, and may incorporate width control. Matrix means encoding loudspeaker feed signals into transmission channel signals, and matrix means decoding transmission channel signals into loudspeaker feed signals may be used giving overall matrix means in accordance with the invention. Matrix means may be used to provide improved directional matching of sounds and associated visual images.
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International Search Report Dated 6 May 1992 Corresponding to International Patent Application PCT/GB92/00267 International Preliminary Examination Report.
Brinich Stephen
Trifield Productions Limited
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