Variable matrix decoder with three output channels
DCFirst Claim
1. A decoder for decoding two or more channel signals in a directional information system wherein one or more input signals containing directional information are encoded into the two or more channel signals, said decoder comprising:
- first means for generating at least a first dominance signal indicative of the ratio of the amplitudes of said two channel signals;
second means for generating at least a second dominance signal indicative of the ratio of the amplitudes of the sum of and the difference between said two channel signals; and
matrix means responsive to said two or more channel signals and to said at least two dominance signals for generating a plurality of output signals for which directional effects of the output signals are enhanced, wherein the first dominance signal DLR and the second dominance signal DCS are given by;
##EQU13## where LT, RT are two channel signals P=LT +RT, M=LT -RT ; and
a is a constant,and wherein said matrix means includes means for deriving three directional control signals EL, ER, EC.
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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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23 Claims
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1. A decoder for decoding two or more channel signals in a directional information system wherein one or more input signals containing directional information are encoded into the two or more channel signals, said decoder comprising:
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first means for generating at least a first dominance signal indicative of the ratio of the amplitudes of said two channel signals; second means for generating at least a second dominance signal indicative of the ratio of the amplitudes of the sum of and the difference between said two channel signals; and matrix means responsive to said two or more channel signals and to said at least two dominance signals for generating a plurality of output signals for which directional effects of the output signals are enhanced, wherein the first dominance signal DLR and the second dominance signal DCS are given by;
##EQU13## where LT, RT are two channel signals P=LT +RT, M=LT -RT ; and
a is a constant,and wherein said matrix means includes means for deriving three directional control signals EL, ER, EC. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for decoding two or more channel signals in a directional information system wherein one or more input signals containing directional information are encoded into the two or more channel signals, said decoder comprising:
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generating at least a first dominance signal indicative of the ratio of the amplitudes of said two channel signals; generating at least a second dominance signal indicative of the ratio of the amplitudes of the sum of and the difference between said two channel signals; and generating in response to said two or more channel signals and to said at least two dominance signals a plurality of output signals for which directional effects of the output signals are enhanced, wherein the first dominance signal DLR and the second dominance signal DCS are given by;
##EQU18## where LT, RT are two channel signals P=LT +RT, M=LT -RT ; and
a is a constant,and wherein said generating step includes deriving three directional control signals EL, ER, EC. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification