US3896271A
Expired / Lapsed
US
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System for a multichannel record disc with crosstalk compensation provided during recording
Assignee: Victor Company of Japan Ltd
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Filing: 1973-05-02
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Granted: 1975-07-22
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Expires: 1993-05-02
Abstract
Abstract A cutting and recording system for multichannel discs has means for applying beforehand crosstalk compensation correction components to the recording signals. This compensation cancels a crosstalk component produced between left and right channels during the recording of multiplexed signals on a disc. This crosstalk correction signal is obtained from an angular modulated wave signal of the left channel system and applied to an angular modulated wave signal of the right channel system. A similar crosstalk correction signal, obtained from the angular modulating means of the right channel system, is applied to the angular modulated wave signal of the left channel system.
Inventors
- 👤 Yukinobu Ishigaki
- 👤 Isao Ohwaki
- 👤 Kohei Sasamura
- 👤 Masahiro Ohba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:46
CPC Classifications
H; H04; H04S; H04S3/00; H04S3/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
471 words
A multichannel disc system for recording first and second channels on a left groove wall and third and fourth channels on a right groove wall of a phonograph record, said system comprising: a. first matrix means for forming a first sum signal and a first difference signal responsive to said first and second channel signals; b. second matrix means for forming a second sum signal and a second difference signal responsive to said third and fourth channel signals; c. first modulating means for angularly modulating a carrier wave responsive to the first difference signal to produce a first angular modulated wave; d. second modulating means for angularly modulating the carrier wave responsive to the second difference signal to produce a second angular modulated wave; e. first attenuating means for attenuating the first angular modulated wave; f. first phase-shifting means for shifting the phase of the output signal of said first attenuating means; g. first phase-invertinG means for inverting the phase of the output signal of said first phase-shifting means; said first attenuating means having an attenuating quantity for making the amplitude of the output signal of said first phaseinverting means equal to the amplitude of a first crosstalk component leaking from the left channel into the right channel; said first phase-shifting means having a phase-shifting quantity for causing the phase angle of the output signal of said first phase-inverting means to cancel the phase angle of the first crosstalk component; h. second attenuating means for attenuating the second angular modulated wave; i. second phase-shifting means for shifting the phase of the output signal of said second attenuating means; j. second phase-inverting means for inverting the phase of the output signal of said second phase-shifting means; said second attenuating means having an attenuating quantity for making the amplitude of the output signal of said second phase-inverting means equal to the amplitude of a second crosstalk component leaking from the right channel into the left channel; said second phase-shifting means having a phaseshifting quantity for causing the phase angle of the output signal of said second phase-inverting means to cancel the phase angle of the second crosstalk component; k. first mixing means for mixing and multiplexing the first direct-wave sum signal, the first angular modulated wave and the output signal of said second phase-inverting means; l. second mixing means for mixing and multiplexing the second direct-wave sum signal, the second angular modulated wave and the output signal of said first phase-inverting means; and m. recording means for recording the output signal of said first and second mixing means on the left and right channel sides, for simultaneously recording the output signal of said first mixing means on the left wall of a groove of a record disc and the output signal of said second mixing means on the right wall of the groove.
Claim 2
Dependent Claim
471 words
A multichannel disc system for recording first and second channels on a left groove wall and third and fourth channels on a right groove wall of a phonograph record, said system comprising: a. first matrix means for forming a first sum signal and a first difference signal responsive to said first and second channel signals; b. second matrix means for forming a second sum signal and a second difference signal responsive to said third and fourth channel signals; c. first modulating means for angularly modulating a carrier wave responsive to the first difference signal to produce a first angular modulated wave; d. second modulating means for angularly modulating the carrier wave responsive to the second difference signal to produce a second angular modulated wave; e. first attenuating means for attenuating the first angular modulated wave; f. first phase-shifting means for shifting the phase of the output signal of said first attenuating means; g. first phase-invertinG means for inverting the phase of the output signal of said first phase-shifting means; said first attenuating means having an attenuating quantity for making the amplitude of the output signal of said first phaseinverting means equal to the amplitude of a first crosstalk component leaking from the left channel into the right channel; said first phase-shifting means having a phase-shifting quantity for causing the phase angle of the output signal of said first phase-inverting means to cancel the phase angle of the first crosstalk component; h. second attenuating means for attenuating the second angular modulated wave; i. second phase-shifting means for shifting the phase of the output signal of said second attenuating means; j. second phase-inverting means for inverting the phase of the output signal of said second phase-shifting means; said second attenuating means having an attenuating quantity for making the amplitude of the output signal of said second phase-inverting means equal to the amplitude of a second crosstalk component leaking from the right channel into the left channel; said second phase-shifting means having a phaseshifting quantity for causing the phase angle of the output signal of said second phase-inverting means to cancel the phase angle of the second crosstalk component; k. first mixing means for mixing and multiplexing the first direct-wave sum signal, the first angular modulated wave and the output signal of said second phase-inverting means; l. second mixing means for mixing and multiplexing the second direct-wave sum signal, the second angular modulated wave and the output signal of said first phase-inverting means; and m. recording means for recording the output signal of said first and second mixing means on the left and right channel sides, for simultaneously recording the output signal of said first mixing means on the left wall of a groove of a record disc and the output signal of said second mixing means on the right wall of the groove.
Claim 3
Dependent Claim
57 words
A multichannel disc recording system as claimed in claim 1 in which said first phase-shifting means comprises an equalizer circuit means having a characteristic equal to the frequency characteristic of the first crosstalk component, and said second phase-shifting means comprises an equalizer circuit means having a characteristic equal to the frequency characteristic of the second crosstalk component.
Claim 4
Dependent Claim
468 words
A multichannel disc recording system for recording first and second channels on a left groove wall and third and fourth channels on a right groove wall of a phonograph record, said system comprising: a. first matrix means for forming a first sum signal and a first difference signal responsive to said first and second channel signals; b. second matrix means for forming a second sum signal and a second difference signal responsive to said third and fourth channel signals; c. first modulating means for angularly modulating a carrier wave responsive to the first difference signal to produce a first angular modulated wave; d. second modulating means for angularly modulating the carrier wave responsive to the second difference signal to produce a second angular modulated wave; e. first attenuating means for attenuating the first angular modulated wave; first phase-inverting means for inverting the phase of the output signal of said first attenuating means; g. first phase-shifting means for shifting the phase of the output signal of said first phase-inverting means; said first attenuating means having an attenuating quantity for setting the amplitude of the output signal of said first phase-shifting means equal to a first crosstalk component leaking from the left channel into the right channel; said first phase-shifting means having a phase-shifting quantity for causing the phase angle of the output signal of said first phase-shifting means to cancel the phase angle of the first crosstalk component; h. second attenuaTing means for attenuating the second angular modulated wave; i. second phase-inverting means for inverting the phase of the output signal of said second attenuating means; j. second phase-shifting means for shifting the phase of the output signal of said second phase-inverting means; said second attenuating means having an attenuating quantity for setting the amplitude of the output signal of said second phase-shifting means equal to the amplitude of a second crosstalk component leaking from the right channel into the left channel; said second phase-shifting means having a phase-shifting quantity for causing the phase angle of the output signal of said second phase-shifting means to cancel the phase angle of the second crosstalk component; k. first mixing means for mixing and multiplexing the first direct-wave sum signal, the first angular modulated wave and the output signal of said second phase-shifting means; l. second mixing means for mixing and multiplexing the second direct-wave sum signal, the second angular modulated wave and the output signal of said first phase-shifting means; and m. recording means for recording the output signal of said first and second mixing means on the left and right channel sides, for simultaneously recording the output signal of said first mixing means on the left wall of a groove of a record disc and the output signal of said second mixing means on the right wall of the groove.
Claim 5
Dependent Claim
468 words
A multichannel disc recording system for recording first and second channels on a left groove wall and third and fourth channels on a right groove wall of a phonograph record, said system comprising: a. first matrix means for forming a first sum signal and a first difference signal responsive to said first and second channel signals; b. second matrix means for forming a second sum signal and a second difference signal responsive to said third and fourth channel signals; c. first modulating means for angularly modulating a carrier wave responsive to the first difference signal to produce a first angular modulated wave; d. second modulating means for angularly modulating the carrier wave responsive to the second difference signal to produce a second angular modulated wave; e. first attenuating means for attenuating the first angular modulated wave; first phase-inverting means for inverting the phase of the output signal of said first attenuating means; g. first phase-shifting means for shifting the phase of the output signal of said first phase-inverting means; said first attenuating means having an attenuating quantity for setting the amplitude of the output signal of said first phase-shifting means equal to a first crosstalk component leaking from the left channel into the right channel; said first phase-shifting means having a phase-shifting quantity for causing the phase angle of the output signal of said first phase-shifting means to cancel the phase angle of the first crosstalk component; h. second attenuaTing means for attenuating the second angular modulated wave; i. second phase-inverting means for inverting the phase of the output signal of said second attenuating means; j. second phase-shifting means for shifting the phase of the output signal of said second phase-inverting means; said second attenuating means having an attenuating quantity for setting the amplitude of the output signal of said second phase-shifting means equal to the amplitude of a second crosstalk component leaking from the right channel into the left channel; said second phase-shifting means having a phase-shifting quantity for causing the phase angle of the output signal of said second phase-shifting means to cancel the phase angle of the second crosstalk component; k. first mixing means for mixing and multiplexing the first direct-wave sum signal, the first angular modulated wave and the output signal of said second phase-shifting means; l. second mixing means for mixing and multiplexing the second direct-wave sum signal, the second angular modulated wave and the output signal of said first phase-shifting means; and m. recording means for recording the output signal of said first and second mixing means on the left and right channel sides, for simultaneously recording the output signal of said first mixing means on the left wall of a groove of a record disc and the output signal of said second mixing means on the right wall of the groove.
Claim 6
Dependent Claim
57 words
A multichannel disc recording system as claimed in claim 3 in which said first phase-shifting means comprises an equalizer circuit means having a chracteristic equal to the frequency characteristic of the first crosstalk component, and said second phase-shifting means comprises an equalizer circuit means having a characteristic equal to the frequency characteristic of the second crosstalk component.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |