Variable matrix decoder
DCFirst Claim
1. A decoder for decoding two or more channel signals in a directional information system wherein at least four 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 a pair of the 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 pair of the 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;
##EQU11## where LT, RT are two channel signals
space="preserve" listing-type="equation">P=L.sub.T +R.sub.T, M=L.sub.T -R.sub.T ;
and a, k are constants;
wherein said matrix means includes means for deriving three directional control signals EL, ER and EC.
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Abstract
The decoder of this invention decodes at least two channel signals in a directional information system where at least four 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. Two decoders of the type described above may be used to decode the high frequency and low frequency portions of the channel signals where the high and low frequency portions are separated by means of two crossover filters. The crossover frequency of the two crossover filters is controlled so that it is approximately at the top end of the signal frequencies intended for the center loudspeaker. Very low frequency signal components are separately processed and evenly distributed among the left, center and right channels.
74 Citations
38 Claims
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1. A decoder for decoding two or more channel signals in a directional information system wherein at least four 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 a pair of the 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 pair of the 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;
##EQU11## where LT, RT are two channel signals
space="preserve" listing-type="equation">P=L.sub.T +R.sub.T, M=L.sub.T -R.sub.T ;and a, k are constants; wherein said matrix means includes means for deriving three directional control signals EL, ER and 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 using a directional information system wherein at least four input signals containing directional information have been encoded into the two or more channel signals, said method comprising:
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generating at least a first dominance signal indicative of the ratio of the amplitudes of a pair of the 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 pair of the channel signals; and generating a plurality of output signals for which directional effects of the output signals are enhanced in response to said two or more channel signals and to said at least two dominance signals, wherein the first dominance signal DLR and the second dominance signals DCS are given by ##EQU16## where LT, RT are two channel signals
space="preserve" listing-type="equation">P=L.sub.T +R.sub.T, M=L.sub.T -R.sub.T ;and a, k are constants. wherein said output signals generating step includes deriving three directional control signals EL, ER, EC. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A decoder for decoding two or more channel signals in a directional information system wherein at least four 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 the sum of and the difference between said pair of the channel signals; and matrix means responsible 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;
##EQU22## where LT, RT are two channel signals
space="preserve" listing-type="equation">P=L.sub.T +R.sub.T, M=L.sub.T -R.sub.T ;and a is a constant, and wherein said matrix means includes means for deriving four directional control signals EL, ER, EC, ES according to the following equations;
##EQU23## - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification