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Title: Compatible four channel radio broadcast and receiving system
Claims: I claim: 1. A compatible four channel system for use in conjunction with a radio transmission system for transmitting four individual audio signals designated L.sub.f, L.sub.b, R.sub.b and R.sub.f over a medium having primary and secondary information channels and first and second subsidiary information channels, said primary and secondary channels carrying information that is consistent and compatible with existing monophonic and stereophonic standards; comprising a. means for forming a first composite signal designated L.sub.T which contains, to the extent they are present, L.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; b. means for forming a second composite signal designated R.sub.T which contains, to the extent they are present, R.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; c. means for forming first and second conjugates of said first and second composite signals, respectively, said first and second conjugates being designated L.sub.T * and R.sub.T *; d. means for forming a sum signal as a function of the sum of L.sub.T and R.sub.T and for applying said sum signal to the primary information channel; e. means for forming a difference signal as a function of the difference between L.sub.T and R.sub.T and for applying said difference signal to said secondary information channel; and f. means for applying said first and second conjugates to said first and second subsidiary channels, respectively. 2. In a compatible four channel audio system for use in conjunction with a radio transmission system for transmitting four individual audio signals designated L.sub.f, L.sub.b, R.sub.b, and R.sub.f over a medium having primary and secondary information channels and first and second subsidiary information channels, said primary and secondary channels carrying information that is consistent and compatible with existing monophonic and stereophonic standards, wherein the transmitter portion of said system comprises means for forming a first composite signal designated L.sub.T which contains, to the extent they are present, L.sub.f in a dominant proportion and L.sub.b and R.sub.b in subdominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; means for forming a second composite signal designated R.sub.T which contains, to the extent they are present, R.sub.f in a dominant proportion and L.sub.b and R.sub.b in subdominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; means for forming first and second conjugates of said first and second composite signals respectively; said first and second conjugates being designated L.sub.T * and R.sub.T *; means for forming a sum signal as a function of the sum of L.sub.T and R.sub.T and for applying said sum signal to the primary information channel; means for forming a difference signal as a function of the difference between L.sub.T and R.sub.T and for applying said difference signal to said secondary information channel; and means for applying said first and second conjugates to said first and second subsidiary channels, respectively, a receiver/decoder comprising: a. means responsive to said primary and secondary channels for processing said sum and difference signals to obtain said first and second composite signals; b. means for combining said first composite signal and said first conjugate to recover said first individual audio signal, L.sub.f ; c. means for combining said second composite signal and said second conjugate to recover said second individual audio signal, R.sub.f ; d. means for combining relatively phase shifted versions of said composite signals; e. means for combining relatively phase shifted versions of said conjugates; and f. means for combining said combined relatively phase shifted composite signals and said combined relatively phase shifted conjugates to recover said third and fourth individual audio signals, R.sub.b and L.sub.b. 3. A compatible four channel system for use in conjunction with a radio transmission system for transmitting four individual audio signals designated L.sub.f, L.sub.b, R.sub.b, and R.sub.f over a medium having primary and secondary information channels and a subsidiary information channel, said primary and secondary channels carrying information that is consistent and compatible with existing monophonic and stereophonic standards, comprising: a. means for forming a first composite signal designated L.sub.T which contains, to the extent they are present, L.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; b. means for forming a second composite signal designated R.sub.T which contains, to the extent they are present, R.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; c. means for forming an auxiliary signal which contains, to the extent they are present, the individual signals L.sub.b and R.sub.b only; d. means for forming a sum signal as a function of the sum of L.sub.T and R.sub.T and for applying said sum signal to the primary information channel; e. means for forming a difference signal as a function of the difference between L.sub.T and R.sub.T and for applying said difference signal to said secondary information channel; and f. means for applying said auxiliary signal to said subsidiary channel. 4. The system as defined by claim 3 wherein said auxiliary signal is formed by adding L.sub.b with R.sub.b without relative phase shift therebetween. 5. In a compatible four channel audio system for use in conjunction with a radio transmission system for transmitting four individual audio signals designated L.sub.f, L.sub.b, R.sub.b and R.sub.f over a medium having primary and secondary information channels and a subsidiary information channel, said primary and secondary channels carrying information that is consistent and compatible with existing monophonic and stereophonic standards, wherein the transmitter portion of said system comprises means for forming a first composite signal designated L.sub.T which contains, to the extent they are present, L.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; means for forming a second composite signal designated R.sub.T which contains, to the extent they are present, R.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; means for forming an auxiliary signal which contains, to the extent they are present, the individual audio signals L.sub.b and R.sub.b only; means for forming a sum signal as a function of the sum of L.sub.T and R.sub.T and for applying said sum signal to the primary information channels; means for forming a difference signal as a function of the difference between L.sub.T and R.sub.T and for applying said difference signal to said secondary information channel; and means for applying said auxiliary signal to said subsidiary channel; a receiver/decoder comprising: a. means responsive to said primary and secondary channels for processing said sum and difference signals to obtain first and second composite signals; b. matrix means for combining said first and second composite signals in predetermined amplitude and phase relationships to obtain four intermediate signals, each of which has a different one of said individual audio signals predominant; c. means responsive to said subsidiary channel for recovering said auxiliary signal; and d. means for combining said auxiliary signal with each of said intermediate signals to obtain four output signals each having a different one of said individual audio signals predominant. 6. The receiver/decoder as defined by claim 5 wherein said means for combining said auxiliary signal with each of said intermediate signals comprises means for phase shifting said auxiliary signal and means for adding said phase shifted auxiliary signal to two of said intermediate signals and means for subtracting said phase shifted auxiliary signal from the other two of said intermediate signals. 7. A compatible four channel system for use in conjunction with a radio transmission system for transmitting four individual audio signals designated L.sub.f, L.sub.b, R.sub.b, and R.sub.f over a medium having primary and secondary information channels and first, second, and third subsidiary information channels, said primary and secondary information channels carrying information that is consistent and compatible with existing monophonic and stereophonic standards, comprising: a. means for forming a first composite signal designated L.sub.T which contains, to the extent they are present, L.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; b. means for forming a second composite signal designated R.sub.T which contains, to the extent they are present, R.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; c. means for forming first, second and third auxiliary signals, each of which contains, to the extent they are present, the individual audio signals L.sub.f, L.sub.b, R.sub.b and R.sub.f in predetermined amplitude and phase relationships; d. means for forming a sum signal as a function of the sum of L.sub.T and R.sub.T and for applying said sum signal to the primary information channel; e. means for forming a difference signal as a function of the difference between L.sub.T and R.sub.T and for applying said difference signal to said secondary information channel; and f. means for applying said first, second and third auxiliary signals to said first, second and third subsidiary channels respectively. 8. In a compatible four channel audio system for use in conjunction with a radio transmission system for transmitting four individual audio signals designated L.sub.f, L.sub.b, R.sub.b and R.sub.f over a medium having primary and secondary information channels and first, second and third subsidiary information channels, said primary and secondary channels carrying information that is consistent and compatible with existing monophonic and stereophonic standards, wherein the transmitter portion of said system comprises means for forming a first composite signal designated L.sub.T which contains, to the extent they are present, L.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; means for forming a second composite signal designated R.sub.T which contains, to the extent they are present, R.sub.f in a dominant proportion and L.sub.b and R.sub.b in sub-dominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; means for forming first, second and third auxiliary signals, each of which contains, to the extent they are present; the individual audio signals L.sub.f, L.sub.b, R.sub.b and R.sub.f in predetermined amplitude and phase relationships; means for forming a sum signal as a function of the sum of L.sub.T and R.sub.T and for applying said sum signal to the primary information channel; means for forming a difference signal as a function of the difference between L.sub.T and R.sub.T and for applying said difference signal to said secondary information channel; and means for applying said first, second and third auxiliary signals to said first, second and third subsidiary channels, respectively, a receiver/decoder comprising: a. means responsive to said primary and secondary channels for processing said sum and difference signals to obtain said first and second composite signals; b. matrix means for combining said first and second composite signals in predetermined amplitude and phase relationships to obtain four intermediate signals, each of which has a different one of said individual audio signals predominant; c. means responsive to said first, second and third subsidiary channels for recovering said first, second and third auxiliary signals; d. means for combining said first auxiliary signal with each of said intermediate signals to obtain four enhanced intermediate signals, each of which has a different one of said individual audio signals predominant; e. means for combining said second auxiliary signal with each of said enhanced intermediate signals to obtain four further enhanced intermediate signals, each of which has a different one of said individual audio signals predominant; and f. means for combining said third auxiliary signal with each of said further enhanced intermediate signals to recover said first, second, third and fourth individual audio signals. 9. A compatible four channel system for use in conjunction with a radio transmission system for transmitting four individual audio signals designated L.sub.f, L.sub.b, R.sub.b and R.sub.f over a medium having primary and secondary information channels and first and second subsidiary information channels, said primary and secondary channels carrying information that is consistent and compatible with existing monophonic and stereophonic standards; comprising a. means for forming a first composite signal designated L.sub.T which contains, to the extent they are present, L.sub.f in a dominant proportion and L.sub.b and R.sub.b in subdominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; b. means for forming a second composite signal designated R.sub.T which contains, to the extent they are present, R.sub.f in a dominant proportion and L.sub.b and R.sub.b in subdominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; c. means for forming a first auxiliary signal by combining all of the individual audio signals, L.sub.f, L.sub.b, R.sub.b and R.sub.f, in equal proportions, to the extent they are present; d. means for forming a second auxiliary signal by combining all of the individual audio signals, L.sub.f, L.sub.b, R.sub.b and R.sub.f, in substantially equal proportions, to the extent they are present, said individual audio signals being combined in different relative phase relationships in said first and second auxiliary signals; e. means for forming a sum signal as a function of the sum of L.sub.T and R.sub.T and for applying said sum signal to the primary information channel; f. means for forming a difference signal as a function of the difference between L.sub.T and R.sub.T and for applying said difference signal to said secondary information channel; and g. means for applying said first and second auxiliary signals to said first and second subsidiary channels, respectively. 10. A system as defined by claim 9 wherein said means for forming said first auxiliary signal includes means for adding the signals L.sub.b and R.sub.b in their original phase relationship and means for adding the signals L.sub.f and R.sub.f in their original phase relationship. 11. A system as defined by claim 10 wherein said means for forming said second auxiliary signal includes means for adding the signals L.sub.b and R.sub.b in phase opposition and means for adding the signals L.sub.f and R.sub.f in phase opposition. 12. In a compatible four channel audio system for use in conjunction with a radio transmission system for transmitting four individual audio signals designated L.sub.f, L.sub.b, R.sub.b, and R.sub.f over a medium having primary and secondary information channels and first and second subsidiary information channels, said primary and secondary channels carrying information that is consistent and compatible with existing monophonic and stereophonic standards, wherein the transmitter portion of said system comprises means for forming a first composite signal designated L.sub.T which contains, to the extent they are present, L.sub.f in dominant proportion and L.sub.b and R.sub.b in subdominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; means for forming a second composite signal designated R.sub.T which contains, to the extent they are present, R.sub.f in a dominant proportion and L.sub.b and R.sub.b in subdominant proportions, L.sub.b and R.sub.b being phase shifted with respect to each other; means for forming first and second auxiliary signals, each of said auxiliary signals including all of the individual audio signals L.sub.f, L.sub.b, R.sub.b and R.sub.f, in substantially equal proportions, to the extent they are present, with the individual audio signals being combined in different relative phase relationships in said first and second auxiliary signals; means for forming a sum signal as a function of the sum of L.sub.T and R.sub.T and for applying said sum signal to the primary information channel; means for forming a difference signal as a function of the difference between L.sub.T and R.sub.T and for applying said difference signal to said secondary information channel; and means for applying said first and second auxiliary signals to said first and second subsidiary channels, respectively, a receiver/decoder comprising: a. means responsive to said primary and secondary channels for processing said sum and difference signals to obtain first and second composite signals; b. matrix means for combining said first and second composite signals in predetermined amplitude and phase relationships to obtain four intermediate signals, each of which has a different one of said individual audio signals predominant; c. means for combining one of said auxiliary signals with each of said intermediate signals to obtain four enhanced intermediate signals, each having a different one of said individual audio signals predominant; and d. means for combining the other auxiliary signal with each of said enhanced intermediate signals to recover said four individual audio signals in substantially their original form. 13. The receiver/decoder as defined by claim 12 wherein said means for combining one of said auxiliary signals with each of said intermediate signals comprises means for phase shifting said auxiliary signal, and means for adding said phase shifted auxiliary signal to two of said intermediate signals and for subtracting said phase shifted auxiliary signal from two of said intermediate signals. Other info: Inventors: Bauer, Benjamin B. (Stamford, CT, US) Application Number: 462044 Filing Date: 1974-04-18 Publication_date: 1976-02-10 Assignee: CBS Inc. (New York, NY) Primary Class(es): 381/6 381/5 Other Classes: US Patent Ref:
Other Refs: Other References: Discrete-Matrix Multichannel Stereo by Cooper et al., Paper Presented Mar. 1972, Central Europe Section Audio Engineering Society. QFMX-Quadruplex FM Transmission Using the 4-4-4 QMX Matrix System by Cooper, Journal AES, Mar. 1974, pp. 82-87. Compatible FM Broadcasting of Panoramic Sound by Gibson et al., AES Preprint Presented Sept. 15, 1972. | |