Patent US3925615A successfully refreshed from Google Patents.
US3925615A
Expired / Lapsed
US
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Multi-channel sound signal generating and reproducing circuits
Assignee: Hitachi Ltd
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Filing: 1973-02-26
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Granted: 1975-12-09
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Expires: 1993-02-26
Abstract
Abstract An arrangement of a multi-channel sound circuit wherein a plurality of original electric signals produced from a plurality of sources of sound signals as arranged on a plane are converted into a plurality of transmission channel signals by means of a matrix circuit which shifts the phases of the electric signals by amounts proportional to the azimuths of the sound signals, respectively, and which adds the electric signals, and wherein the original sound signals are reproduced from the transmission channel signals by means of a circuit which has the same arrangement as the matrix circuit, said matrix circuit involving a plurality of factor matrices, and having an element 1 in each matrix formed of a first phase shifter circuit and an element neither 1 nor 0 formed of a second phase shifter circuit, the phase difference between the first and second phase shifter circuits being made a predetermined value, whereby the matrix circuit is arranged simply and economically.
Inventors
- 👤 Yasuaki Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:13
CPC Classifications
H; H04; H04S; H04S3/00; H04S3/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
240 words
A matrix circuit comprising first, second, third, and fourth input terminals; first arithmetic circuit means for adding signals provided from said first and second input terminals; second arithmetic circuit means for subtracting said signal of said second input terminal from said signal of said first input terminal; third arithmetic circuit means for adding signals from said third and fourth input terminals; fourth arithmetic circuit means for subtracting said signal of said fourth input terminal from said signal of said third input terminal; first, second, and third phase shifters having a first phase shift which are respectively connected to the outputs of said first, second, and third arithmetic circuit means; a fourth phase shifter having a second phase shift connected to the output of said fourth arithmetic circuit means, fifth arithmetic circuit means for adding the outputs of said first and third phase shifters; sixth arithmetic circuit means for subtracting the output of said fourth phase shifter from the output of said second phase shifter; seventh arithmetic circuit means for subtracting said output of said third phase shifter from said output of said first phase shifter; eighth arithmetic circuit means for subtracting said output of said second phase shifter from said output of said fourth phase shifter; and first, second, third, and fourth output terminals which are respectively connected to said fifth, sixth, seventh, and eighth arithmetic circuit means; the phase difference between said first and second phase shifts being 90*.
Claim 2
Dependent Claim
240 words
A matrix circuit comprising first, second, third, and fourth input terminals; first arithmetic circuit means for adding signals provided from said first and second input terminals; second arithmetic circuit means for subtracting said signal of said second input terminal from said signal of said first input terminal; third arithmetic circuit means for adding signals from said third and fourth input terminals; fourth arithmetic circuit means for subtracting said signal of said fourth input terminal from said signal of said third input terminal; first, second, and third phase shifters having a first phase shift which are respectively connected to the outputs of said first, second, and third arithmetic circuit means; a fourth phase shifter having a second phase shift connected to the output of said fourth arithmetic circuit means, fifth arithmetic circuit means for adding the outputs of said first and third phase shifters; sixth arithmetic circuit means for subtracting the output of said fourth phase shifter from the output of said second phase shifter; seventh arithmetic circuit means for subtracting said output of said third phase shifter from said output of said first phase shifter; eighth arithmetic circuit means for subtracting said output of said second phase shifter from said output of said fourth phase shifter; and first, second, third, and fourth output terminals which are respectively connected to said fifth, sixth, seventh, and eighth arithmetic circuit means; the phase difference between said first and second phase shifts being 90*.
Claim 3
Dependent Claim
218 words
A matrix circuit comprising first, second, third, and fourth input terminals; first, second, third, and fourth phase shifters having a first phase shift which are respectively connected to said first, second, third, and fourth input terminals; first arithmetic circuit means for subtracting a signal of said fourth input terminal from a signal of said third input terminal; a fifth phase shifter having a second phase shift connected to the output of said first arithmetic circuit means; second arithmetic circuit means for producing a sum among outputs of said first, second, third, and fourth phase shifters; third arithmetic circuit means for subtracting said output of said second phase shifter from a sum between said output of said first phase shifter and an output of said fifth phase shifter; fourth arithmetic circuit means for subtracting said outputs of said third and fourth phase shifters from a sum between said outputs of said first and second phase shifters; and fifth arithmetic circuit means for subtracting said output of said second phase shifter and said output of said fifth phase shifter from said output of said first phase shifter; the the phase difference between said first and second phase shifts being 90*; and first, second, third, and fourth output terminals respectively connected to said second, third, fourth, and fifth arithmetic circuit means.
Claim 4
Dependent Claim
218 words
A matrix circuit comprising first, second, third, and fourth input terminals; first, second, third, and fourth phase shifters having a first phase shift which are respectively connected to said first, second, third, and fourth input terminals; first arithmetic circuit means for subtracting a signal of said fourth input terminal from a signal of said third input terminal; a fifth phase shifter having a second phase shift connected to the output of said first arithmetic circuit means; second arithmetic circuit means for producing a sum among outputs of said first, second, third, and fourth phase shifters; third arithmetic circuit means for subtracting said output of said second phase shifter from a sum between said output of said first phase shifter and an output of said fifth phase shifter; fourth arithmetic circuit means for subtracting said outputs of said third and fourth phase shifters from a sum between said outputs of said first and second phase shifters; and fifth arithmetic circuit means for subtracting said output of said second phase shifter and said output of said fifth phase shifter from said output of said first phase shifter; the the phase difference between said first and second phase shifts being 90*; and first, second, third, and fourth output terminals respectively connected to said second, third, fourth, and fifth arithmetic circuit means.
Claim 5
Dependent Claim
313 words
Multi-channel sound system having first matrix circuit for encoding four directional input signals obtained from four signal sources arranged in such manner that their azimuths on a plane are spaced by approximately 90*, a plurality of transmission channels for transmitting or recording the output signals of the first matrix circuit and a second matrix circuit for decoding the transmitted signal and reproducing four directional output sound signals correlated with the input signals, wherein said matrix circuits include first, second, third, and fourth input terminals; first arithmetic circuit means for adding the outputs of said first and second input terminals; second arithmetic circuit means for subtracting said signal of said second input terminal from said signal of said first input terminal; third arithmetic circuit means for adding signals from said third and fourth input terminals; fourth arithmetic circuit means for subtracting said signal of said fourth input terminal from said signal of said third input terminal; first, second, and third phase shifters having a first phase shift which are respectively connected to the outputs of said first, second, and third arithmetic circuit means; a fourth phase shifter having a second phase shift connected to the output of said fourth arithmetic circuit means, fifth arithmetic circuit means for adding the outputs of said first and third phase shifters; sixth arithmetic circuit means for subtracting the output of said fourth phase shifter from the output of said second phase shifter; seventh arithmetic circuit means for subtracting said output of said third phase shifter from said output of said first phase shifter; eighth arithmetic circuit means for subtracting said output of said second phase shifter from said output of said fourth phase shifter; and first, second, third, and fourth output terminals which are respectively connected to said fifth, sixth, seventh, and eighth arithmetic circuit means; the phase difference between said first and second phase shifts being 90*.
Claim 6
Dependent Claim
313 words
Multi-channel sound system having first matrix circuit for encoding four directional input signals obtained from four signal sources arranged in such manner that their azimuths on a plane are spaced by approximately 90*, a plurality of transmission channels for transmitting or recording the output signals of the first matrix circuit and a second matrix circuit for decoding the transmitted signal and reproducing four directional output sound signals correlated with the input signals, wherein said matrix circuits include first, second, third, and fourth input terminals; first arithmetic circuit means for adding the outputs of said first and second input terminals; second arithmetic circuit means for subtracting said signal of said second input terminal from said signal of said first input terminal; third arithmetic circuit means for adding signals from said third and fourth input terminals; fourth arithmetic circuit means for subtracting said signal of said fourth input terminal from said signal of said third input terminal; first, second, and third phase shifters having a first phase shift which are respectively connected to the outputs of said first, second, and third arithmetic circuit means; a fourth phase shifter having a second phase shift connected to the output of said fourth arithmetic circuit means, fifth arithmetic circuit means for adding the outputs of said first and third phase shifters; sixth arithmetic circuit means for subtracting the output of said fourth phase shifter from the output of said second phase shifter; seventh arithmetic circuit means for subtracting said output of said third phase shifter from said output of said first phase shifter; eighth arithmetic circuit means for subtracting said output of said second phase shifter from said output of said fourth phase shifter; and first, second, third, and fourth output terminals which are respectively connected to said fifth, sixth, seventh, and eighth arithmetic circuit means; the phase difference between said first and second phase shifts being 90*.
Claim 7
Dependent Claim
64 words
Multi-channel sound system according to claim 3, wherein the transmission channel consists of two transmission channels, one of which connects the first output terminal of the first matrix circuit to the first input terminal of the second matrix circuit and another one of which connects the third output terminal of said first matrix circuit to the third input terminal of said second matrix circuit.
Claim 8
Dependent Claim
50 words
Multi-channel sound system according to claim 3, wherein the transmission channels are made up of four transmission channels which transmit the outputs of the first, second, third, and fourth output terminals of the first matrix circuit to first, second, third, and fourth input terminals of the second matrix circuit, respectively.
Claim 9
Dependent Claim
290 words
Multi-channel sound system having a first matrix circuit for encoding a four directional input signal obtained from four signal sources arranged in such manner that their azimuths on a plane are spaced by approximately 90*, a plurality of transmission channels for transmitting the output signals of the signals of the first matrix circuit and a second matrix circuit for decoding the transmitted signal and reproducing directional output sound signals correlated with the input signals, wherein said matrix circuit includes first, second, third, and fourth input terminals; first, second, third, and fourth phase shifters having a first phase shift which are respectively connected to said first, second, third, and fourth input terminals; first arithmetic circuit means for subtracting a signal of said fourth input terminal from a signal of said third input terminal; a fifth phase shifter having a phase shift connected to the output of said first arithmetic circuit means; second arithmetic circuit means for producing a sum among outputs of said first, second, third, and fourth phase shifters; third arithmetic circuit means for subtracting said output of said second phase shifter from a sum between said output of said first phase shifter and an output of said fifth phase shifter; fourth arithmetic circuit means for subtracting said outputs of said third and fourth phase shifters from a sum between said outputs of said first and second phase shifters; and fifth arithmetic circuit means for subtracting said output of said second phase shifter and said output of said fifth phase shifter from said output of said first phase shifter; the phase difference between said first and second phase shifts being 90*;and first, second, third, and fourth output terminals respectively connected to said second, third, fourth, and fifth arithmetic circuit means.
Claim 10
Dependent Claim
290 words
Multi-channel sound system having a first matrix circuit for encoding a four directional input signal obtained from four signal sources arranged in such manner that their azimuths on a plane are spaced by approximately 90*, a plurality of transmission channels for transmitting the output signals of the signals of the first matrix circuit and a second matrix circuit for decoding the transmitted signal and reproducing directional output sound signals correlated with the input signals, wherein said matrix circuit includes first, second, third, and fourth input terminals; first, second, third, and fourth phase shifters having a first phase shift which are respectively connected to said first, second, third, and fourth input terminals; first arithmetic circuit means for subtracting a signal of said fourth input terminal from a signal of said third input terminal; a fifth phase shifter having a phase shift connected to the output of said first arithmetic circuit means; second arithmetic circuit means for producing a sum among outputs of said first, second, third, and fourth phase shifters; third arithmetic circuit means for subtracting said output of said second phase shifter from a sum between said output of said first phase shifter and an output of said fifth phase shifter; fourth arithmetic circuit means for subtracting said outputs of said third and fourth phase shifters from a sum between said outputs of said first and second phase shifters; and fifth arithmetic circuit means for subtracting said output of said second phase shifter and said output of said fifth phase shifter from said output of said first phase shifter; the phase difference between said first and second phase shifts being 90*;and first, second, third, and fourth output terminals respectively connected to said second, third, fourth, and fifth arithmetic circuit means.
Claim 11
Dependent Claim
66 words
Multi-channel sound system according to claim 6, wherein the transmission channel consists of two transmission channels, one of which connects the first output terminal of the first matrix circuit to the first input terminal of the second matrix circuit, and the other one of which channels connects the third output terminal of said first matrix circuit to the third input terminal of said second matrix circuit.
Claim 12
Dependent Claim
51 words
Multi-channel sound system according to claim 6, wherein the transmission channels are made up of four transmission channels which transmit the outputs of the first, second, third, and fourth output terminals of the first matrix circuit to the first, second, third, and fourth input terminals of said second matrix circuit, respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |