US3745252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrixes and decoders for quadruphonic records
Assignee: CBS Broadcasting Inc
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Filing: 1971-02-03
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Granted: 1973-07-10
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Expires: 1991-02-03
Abstract
Abstract Method and apparatus for recording four separate channels of information on a medium having only two independent tracks, such as a phonograph record, and method and apparatus for reproducing such information and presenting it on four loudspeakers to give the illusion of sound coming from four separate sources. The signals recorded in the manner described in this application are also reproducible on conventional stereophonic playback systems, distributing the four separate channels to the two loudspeakers in a manner to give a balanced and symmetrical reproduction. Two embodiments of encoding apparatus for combining the four input signals preparatory to recording on the two-track medium, and two decoders, one for each of the encoding systems, are described.
Inventors
- 👤 B Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:06
CPC Classifications
H; H04; H04S; H04S3/00; H04S3/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
525 words
Encoding apparatus for matrixing four signals designated Lf, Lb, Rb and Rf into two composite signals designated LT and RT for recording or transmission on a two-track medium, said apparatus comprising: first, second, third and fourth input terminals to which said Lf, Lb, Rb and Rf signals are respectively applied, first and second output terminals, and signal transfer means connected in circuit between said input terminals and said output terminals to transfer signals from the input terminals to the output terminals, said signaltransfer means including a first summing circuit connected to add a predetermined first portion of the Lf signal from the first input terminal to a like first portion of the Lb signal from the second input terminal to produce a first sum signal, a second summing circuit connected to add said predetermined first portion of the Rf signal from the fourth input terminal to a like portion of the Rb signal from the third input terminal to produce a second sum signal, a third summing circuit connected to combine in phase opposition a second predetermined portion smaller than said first predetermined portion of the Lf signal from the first input terminal and a like smaller portion of the Lb signal from the second input terminal to produce a third sum signal, a fourth summing circuit connected to combine in phase opposition said second predetermined smaller portion than said first predetermined portion of the Rf signal from the fourth input terminal and a like smaller portion of the Rb signal from the third input terminal to produce a fourth sum signal, a fifth summing circuit connected to add said first sum signal to said fourth sum signal and first all-pass phase-shifting means operative to cause the first sum signal received by said fifth summing means to be substantially in phase quadrature with the fourth sum signal received by said fifth summing circuit, a sixth summing circuit connected to add said second sum signal to said third sum signal and second all-pass phase-shifting means operative to cause the second sum signal received by said sixth summing circuit to be substantially in phase quadrature with the third sum signal received by said sixth summing circuit, and means connecting the output terminals of said fifth and sixth summing circuits to said first and second output terminals, respectively, thereby to produce at said first output terminal a composite signal LT consisting of said predetermined first portion of said Lf and Lb signals and said second predetermined smaller portion of said Rf and Rb signals and wherein the Rf signal is substantially in quadrature with one of the Lf and Lb signals and the Rb signal is substantially in quadrature with the other of the Lf and Lb signals, and to produce at said second output terminal a composite signal RT consisting of said predetermined first portion of said Rf and Rb signals and said second predetermined smaller portion of the Lf and Lb signals and wherein the Lf signal is substantially in quadrature with one of the Rb and Rf signals and the Lb signal is substantially in quadrature with the other of the Rf and Rb signals.
Claim 2
Dependent Claim
525 words
Encoding apparatus for matrixing four signals designated Lf, Lb, Rb and Rf into two composite signals designated LT and RT for recording or transmission on a two-track medium, said apparatus comprising: first, second, third and fourth input terminals to which said Lf, Lb, Rb and Rf signals are respectively applied, first and second output terminals, and signal transfer means connected in circuit between said input terminals and said output terminals to transfer signals from the input terminals to the output terminals, said signaltransfer means including a first summing circuit connected to add a predetermined first portion of the Lf signal from the first input terminal to a like first portion of the Lb signal from the second input terminal to produce a first sum signal, a second summing circuit connected to add said predetermined first portion of the Rf signal from the fourth input terminal to a like portion of the Rb signal from the third input terminal to produce a second sum signal, a third summing circuit connected to combine in phase opposition a second predetermined portion smaller than said first predetermined portion of the Lf signal from the first input terminal and a like smaller portion of the Lb signal from the second input terminal to produce a third sum signal, a fourth summing circuit connected to combine in phase opposition said second predetermined smaller portion than said first predetermined portion of the Rf signal from the fourth input terminal and a like smaller portion of the Rb signal from the third input terminal to produce a fourth sum signal, a fifth summing circuit connected to add said first sum signal to said fourth sum signal and first all-pass phase-shifting means operative to cause the first sum signal received by said fifth summing means to be substantially in phase quadrature with the fourth sum signal received by said fifth summing circuit, a sixth summing circuit connected to add said second sum signal to said third sum signal and second all-pass phase-shifting means operative to cause the second sum signal received by said sixth summing circuit to be substantially in phase quadrature with the third sum signal received by said sixth summing circuit, and means connecting the output terminals of said fifth and sixth summing circuits to said first and second output terminals, respectively, thereby to produce at said first output terminal a composite signal LT consisting of said predetermined first portion of said Lf and Lb signals and said second predetermined smaller portion of said Rf and Rb signals and wherein the Rf signal is substantially in quadrature with one of the Lf and Lb signals and the Rb signal is substantially in quadrature with the other of the Lf and Lb signals, and to produce at said second output terminal a composite signal RT consisting of said predetermined first portion of said Rf and Rb signals and said second predetermined smaller portion of the Lf and Lb signals and wherein the Lf signal is substantially in quadrature with one of the Rb and Rf signals and the Lb signal is substantially in quadrature with the other of the Rf and Rb signals.
Claim 3
Dependent Claim
28 words
Apparatus according to claim 1, wherein said predetermined first portion is substantially the decimal fraction 0.924 and said predetermined second smaller portion is substantially the decimal fraction 0.383.
Claim 4
Dependent Claim
97 words
Encoding apparatus according to claim 1, wherein for in-phase input signals Lf, Lb, Rb and Rf said summing circuits and said phase-shifting means are operative to cause the Lf and Lb signals in the composite signal LT and the Rf and Rb signals in the composite signal RT to all be substantially in phase, to cause the Rf and Rb signals in the composite signal LT to be substantially in phase opposition with one another, and to cause the Lf and Lb signals in the composite signal RT to be substantially in phase opposition with one another.
Claim 5
Dependent Claim
50 words
Encoding apparatus according to claim 1, wherein the said all-pass phase-shifting means are operative to shift the phase of said first, second, third and fourth sum signals to cause the relative phase angles of said first, second, third and fourth sum signals to be 90*, 135*, 45* and 0*, respectively.
Claim 6
Dependent Claim
513 words
Decoding apparatus for reproducing four different signals from two composite signals LT and RT wherein the LT signal contains a predetermined first portion of signals designated Lf and Lb and a second predetermined smaller portion than than said first predetermined portion of signals designated Rf and Rb and wherein the Rf signal is substantially in quadrature with one of the Lf and Lb signals and the Rb signal is substantially in quadrature with the other of said Lf and Lb signals and wherein the RT signal contains said predetermined first portion of the said Rf and Rb signals and said second predetermined smaller portion of the said Lf and Lb signals and wherein the Lf signal is substantially in quadrature with one of said Rf and Rb signals and the Lb signal is substantially in quadrature with the other of said Rf and Rb signals, said apparatus comprising: first and second input circuits to which the LT and RT signals are respectively applied, said input circuits including all-pass phase-shifting means operative to shift the relative phase of said LT and RT signals by a predetermined angle to position corresponding components thereof either in phase or in phase opposition to permit later addition or subtraction of said corresponding components, and first, second, third and fourth signal-combining networks, each having first and second input terminals and an output terminal, each connected to receive at its first and second input terminals a signal from said first and second input circuits, respectively, said first signal-combining network being operative to combine a portion of the signal from said first input circuit equal to said predetermined first portion with the inverse of a portion of the signal from said second input circuit equal to said predetermined second portion and to produce at its output terminal a first output signal containing one of said Lf and Lb signals as its predominant component, said second signal-combining network being operative to combine a portion of the signal from said first input circuit equal to said predetermined first portion with a portion of the signal from said second input circuit equal to said predetermined second portion and to produce at its output terminal a second output signal containing the other of said Lf and Lb signals as its predominant component, said third signal-combining network being operative to combine a portion of the signal from said first input circuit equal to said predetermined second portion with a portion of the signal from said second input circuit equal to said predetermined first portion and to produce at its output terminal a third output signal containing one of said Rf and Rb signals as its predominant component, and said fourth signal-combining networK being operative to combine the inverse of a portion of the signal from said first input circuit equal to said predetermined second portion with a portion of the signal from said second input circuit equal to said predetermined first portion and to produce at its output terminal a fourth output signal containing the other of said Rf and Rb signals as its predominant component.
Claim 7
Dependent Claim
513 words
Decoding apparatus for reproducing four different signals from two composite signals LT and RT wherein the LT signal contains a predetermined first portion of signals designated Lf and Lb and a second predetermined smaller portion than than said first predetermined portion of signals designated Rf and Rb and wherein the Rf signal is substantially in quadrature with one of the Lf and Lb signals and the Rb signal is substantially in quadrature with the other of said Lf and Lb signals and wherein the RT signal contains said predetermined first portion of the said Rf and Rb signals and said second predetermined smaller portion of the said Lf and Lb signals and wherein the Lf signal is substantially in quadrature with one of said Rf and Rb signals and the Lb signal is substantially in quadrature with the other of said Rf and Rb signals, said apparatus comprising: first and second input circuits to which the LT and RT signals are respectively applied, said input circuits including all-pass phase-shifting means operative to shift the relative phase of said LT and RT signals by a predetermined angle to position corresponding components thereof either in phase or in phase opposition to permit later addition or subtraction of said corresponding components, and first, second, third and fourth signal-combining networks, each having first and second input terminals and an output terminal, each connected to receive at its first and second input terminals a signal from said first and second input circuits, respectively, said first signal-combining network being operative to combine a portion of the signal from said first input circuit equal to said predetermined first portion with the inverse of a portion of the signal from said second input circuit equal to said predetermined second portion and to produce at its output terminal a first output signal containing one of said Lf and Lb signals as its predominant component, said second signal-combining network being operative to combine a portion of the signal from said first input circuit equal to said predetermined first portion with a portion of the signal from said second input circuit equal to said predetermined second portion and to produce at its output terminal a second output signal containing the other of said Lf and Lb signals as its predominant component, said third signal-combining network being operative to combine a portion of the signal from said first input circuit equal to said predetermined second portion with a portion of the signal from said second input circuit equal to said predetermined first portion and to produce at its output terminal a third output signal containing one of said Rf and Rb signals as its predominant component, and said fourth signal-combining networK being operative to combine the inverse of a portion of the signal from said first input circuit equal to said predetermined second portion with a portion of the signal from said second input circuit equal to said predetermined first portion and to produce at its output terminal a fourth output signal containing the other of said Rf and Rb signals as its predominant component.
Claim 8
Dependent Claim
29 words
Decoding apparatus according to claim 19 wherein said predetermined first portion is substantially the decimal fraction 0.924 and said predetermined second smaller portion is substantially the decimal fraction 0.383.
Claim 9
Dependent Claim
51 words
Decoding apparatus according to claim 5, wherein said input circuits are operative to introduce a relative phase shift of substantially 90* between said LT and RT composite signals, and wherein said first, second, third and fourth output signals respectively contain the Lf, Lb, Rb and Rf signals as its predominant component.
Claim 10
Dependent Claim
51 words
Decoding apparatus according to claim 5, wherein said input circuits are operative to introduce a relative phase shift of substantially 45* between the LT and RT composite signals, and wherein said first, second, third and fourth output signals respectively contain the Lb, Lf, Rf and Rb signals as its predominant component.
Claim 11
Dependent Claim
316 words
Encoding apparatus for matrixing four input signals designated Lf, Lb, Rb and Rf into two composite signals, said apparatus comprising: first, second, third and fourth input terminals to which said Lf, Lb, Rb and Rf are respectively applied, first and second output terminals, circuit means including means for shifting the phase of said Rf input signal at said fourth input terminal by a reference phase-shift angle and for shifting the phase of said Lb input signal at said second input terminal by said reference phase-shift angle plus 90* and operative to couple first and second predetermined portions, respectively, of said phase shifted Rf and Lb signals to said first output terminal, circuit means including means for shifting the phase of said Rb input signal at said third input terminal by said reference phase-shift angle and for shifting the phase of said Lf input signal at said first input terminal by said reference phase-shift angle plus 90* and operative to couple said first and second predetermined portions, respectively, of said phase-shifted Rb and Lf signals to said first input terminal, circuit means including means for shifting the phase of said Lb input signal at said second input terminal by said reference phase-shift angle and for shifting the phase of said Rf input signal at said fourth input terminal by said reference phase-shift angle plus 90* and operative to couple said first and second predetermined portions, respectively, of said phase-shifted Lb and Rf signals to said second output terminal, and circuit means including means for shifting the phase of said Lf input signal at said first input terminal by said reference phase-shift angle and for shifting the phase of said Rb input signal at said third input terminal by said reference phase-shift angle plus 90* and operative to couple said first and second predetermined portions, respectively, of said phase-shifted Lf and Rb signals to said second output terminal.
Claim 12
Dependent Claim
316 words
Encoding apparatus for matrixing four input signals designated Lf, Lb, Rb and Rf into two composite signals, said apparatus comprising: first, second, third and fourth input terminals to which said Lf, Lb, Rb and Rf are respectively applied, first and second output terminals, circuit means including means for shifting the phase of said Rf input signal at said fourth input terminal by a reference phase-shift angle and for shifting the phase of said Lb input signal at said second input terminal by said reference phase-shift angle plus 90* and operative to couple first and second predetermined portions, respectively, of said phase shifted Rf and Lb signals to said first output terminal, circuit means including means for shifting the phase of said Rb input signal at said third input terminal by said reference phase-shift angle and for shifting the phase of said Lf input signal at said first input terminal by said reference phase-shift angle plus 90* and operative to couple said first and second predetermined portions, respectively, of said phase-shifted Rb and Lf signals to said first input terminal, circuit means including means for shifting the phase of said Lb input signal at said second input terminal by said reference phase-shift angle and for shifting the phase of said Rf input signal at said fourth input terminal by said reference phase-shift angle plus 90* and operative to couple said first and second predetermined portions, respectively, of said phase-shifted Lb and Rf signals to said second output terminal, and circuit means including means for shifting the phase of said Lf input signal at said first input terminal by said reference phase-shift angle and for shifting the phase of said Rb input signal at said third input terminal by said reference phase-shift angle plus 90* and operative to couple said first and second predetermined portions, respectively, of said phase-shifted Lf and Rb signals to said second output terminal.
Claim 13
Dependent Claim
22 words
Encoding apparatus in accordance with claim 9, wherein said first and second predetermined portions are respectively the decimal fractions 0.383 and 0.924.
References Cited (Backward Citations)
US3632886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |