Stereo decoding system
First Claim
1. A method for decoding a stereo multiplex signal, comprising:
 converting the stereo multiplex signal into a sum signal (L+R) and a difference signal (L−
R), where the sum signal and the difference signal are derived from a left stereo signal (L) and right stereo signal (R);
determining a first transfer function H_{L}(f) and a second transfer function H_{R}(f) from the sum signal (L+R) and the difference signal (L−
R), wherein the first transfer function H_{L}(f) and the second transfer function H_{R}(f) are each variable and adjustable;
adaptively filtering the sum signal (L+R) by modifying first filter coefficients according to the first transfer function to provide the left stereo signal (L); and
adaptively filtering the sum signal (L+R) by modifying second filter coefficients according to the second transfer function to provide the right stereo signal (R).
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Accused Products
Abstract
A system for decoding a stereo multiplex signal, including one or more devices operable to convert the stereo multiplex signal into a sum signal (L+R) and a difference signal (L−R). The sum signal and the difference signal may be derived from a left stereo signal (L) and right stereo signal (R). The system may also be operable to determine a first transfer function H_{L}(f) and a second transfer function (H_{R}(f)) from the sum signal (L+R) and the difference signal (L−R). Further, the system may be operable to filter the sum signal (L+R) according to the first transfer function to provide the left stereo signal (L), and filter the sum signal (L+R) according to the second transfer function to provide the right stereo signal (R).
6 Citations
20 Claims

1. A method for decoding a stereo multiplex signal, comprising:

converting the stereo multiplex signal into a sum signal (L+R) and a difference signal (L−
R), where the sum signal and the difference signal are derived from a left stereo signal (L) and right stereo signal (R);determining a first transfer function H_{L}(f) and a second transfer function H_{R}(f) from the sum signal (L+R) and the difference signal (L−
R), wherein the first transfer function H_{L}(f) and the second transfer function H_{R}(f) are each variable and adjustable;adaptively filtering the sum signal (L+R) by modifying first filter coefficients according to the first transfer function to provide the left stereo signal (L); and adaptively filtering the sum signal (L+R) by modifying second filter coefficients according to the second transfer function to provide the right stereo signal (R).  View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)


12. A system for decoding a stereo multiplex signal, comprising:

a stereo decoder that converts the stereo multiplex signal into a sum signal (L+R) and a difference signal (L−
R);a first filter that is connected to the stereo decoder and that is operable to filter the sum signal (L+R) according to a first transfer function to provide a left stereo signal (L); a second filter that is connected to the stereo decoder and that is operable to filter the sum signal (L+R) according to a second transfer function to provide a right stereo signal (R); and a filter control unit that is connected to the stereo decoder and that is operable to control the first filter and the second filter by providing modified filter coefficients as control signals representing the first transfer function and the second transfer function, respectively, wherein the first filter and the second filter are adaptive, and wherein the first transfer function and the second transfer function are each variable and adjustable.  View Dependent Claims (13, 14, 15, 16, 17, 18, 19)


20. A nontransitory computer readable storage medium storing computer readable instructions executable by a processor to decode a stereo multiplex signal, the computer readable medium comprising instructions to:

convert the stereo multiplex signal into a sum signal (L+R) and a difference signal (L−
R), where the sum signal and the difference signal are derived from a left stereo signal (L) and right stereo signal (R);determine a first transfer function H_{L}(f) and a second transfer function (H_{R}(f)) from the sum signal (L+R) and the difference signal (L−
R), wherein the first transfer function H_{L}(f) and the second transfer function H_{R}(f) are each variable and adjustable;adaptively filter the sum signal (L+R) by modifying first filter coefficients according to the first transfer function to provide the left stereo signal (L); and adaptively filter the sum signal (L+R) by modifying second filter coefficients according to the second transfer function to provide the right stereo signal (R).

1 Specification