Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Patent
1989-06-01
1991-09-03
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Quadrasonic
H04S 300
Patent
active
050460986
ABSTRACT:
The decoder of this invention decodes at least two channel signals in a directional information system where one or more input signals containing directional information have been encoded into the two or more channel signals. The decoder generates a first control signal substantially proportional to the logarithm of the ratio of the amplitudes of two of the channel signals to detect, as between two of the channel signals, whether the amplitude of one signal dominates that of the other. The decoder also generates a second control signal substantially proportional to the logarithm of the ratio of the amplitudes of the sum and the difference between two of the channel signals to detect the dominant signal in terms of amplitude. The decoder includes a matrix means responsive to the two or more channel signals and the two control signals for generating a number of output signals according to an algorithm. The control signals generated are used to steer the directional information systems in such manner through the matrix means that the directional effects of the output signals are enhanced. The matrix means generates three directional control signals from the two control signals.
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Dressler Roger
Mandell Douglas E.
Todd Craig C.
Dolby Laboratories Licensing Corporation
Isen Forester W.
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