Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Reexamination Certificate
2007-10-09
2007-10-09
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Binaural and stereophonic
Quadrasonic
C381S022000, C381S021000, C381S023000
Reexamination Certificate
active
10362786
ABSTRACT:
A method derives at least three audio signals, each associated with a direction, from two input audio signals. In response to the two input signals, a passive matrix generates a plurality of passive matrix audio signals, including two pairs of passive matrix audio signals, a first pair of passive amtrix audio signals represent directions lying on a first axis and a second pair of passive matrix audio signals represent direction lying on a second axis, the first and second aces being substantially at ninety degrees to ach other. The pairs of passive matrix audio signals are processed to derive a plurality of matrix coefficients therefrom, The processing includes deriving a pair of intermediate signals and urging each pair of intermediate signals toward equality in response to a respective error signal. At least three output signals are produced by matrix multiplying the two input signals by the matrix coefficients.
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Andersen Robert L.
Fosgate James W.
Vernon Stephen Decker
Chin Vivian
Dolby Laboratories Licensing Corporation
Faulk Devona E.
Gallagher & Lathrop
Gallagher, Esq. Thomas A.
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