Patent US4668997A successfully refreshed from Google Patents.
US4668997A
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Recording and reproducing system for color video signal
Assignee: Fujifilm Holdings Corp
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Filing: 1985-01-23
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Granted: 1987-05-26
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Expires: 2005-01-23
Abstract
Abstract A color video signal recording system in which a quadrature two-phase balance-modulated color signal is produced by subjecting a subcarrier to quadrature two-phase balanced modulation by two color signals; and a demodulation-purpose reference phase signal is produced which has the same frequency as that of the subcarrier and which is to be frequency-interleaved with the quadrature two-phase balance-modulated color signal. The quadrature two-phase balance-modulated color signal and the demodulation-purpose reference phase signal together with a carrier luminance signal are multi-plexed and the multiplex signal recorded.
Inventors
- 👤 Masahiko Nagano
- 👤 Naoaki Sakaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:07
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A color video signal recording system comprising means for producing a quadrature two-phase balance-modulated color signal by subjecting a subcarrier to quadrature twophase balanced modulation by two color signals, means for producing a demodulation-purpose reference phase signal which has the same frequency as that of the subcarrier and which is to be frequency-interleaved with said quadrature two-phase balance-modulated color signal, means for multiplexing said quadrature two-phase balance-modulated color signal and said demodulation-purpose reference phase signal together with a..carrier luminance signal, and means for recording said multiplex signal.
Claim 2
Dependent Claim
87 words
A color video signal recording system comprising means for producing a quadrature two-phase balance-modulated color signal by subjecting a subcarrier to quadrature twophase balanced modulation by two color signals, means for producing a demodulation-purpose reference phase signal which has the same frequency as that of the subcarrier and which is to be frequency-interleaved with said quadrature two-phase balance-modulated color signal, means for multiplexing said quadrature two-phase balance-modulated color signal and said demodulation-purpose reference phase signal together with a..carrier luminance signal, and means for recording said multiplex signal.
Claim 3
Dependent Claim
40 words
The color video signal recording system as claimed in claim 1 wherein the quadrature two-phase balance-modulated color signal and the demodulation-purpose reference phase signal are selected to have the frequency lower than the lower band of the carrier luminance signal.
Claim 4
Independent Claim
118 words
A system for reproducing a color video signal recorded on a recording medium, said color video signal being provided by multiplexing a quadrature two-phase balance-modulated color signal obtained by subjecting a subcarrier to quadrature two-phase balanced modulation by two color signals and a demodulation-purpose reference phase signal which has the same frequency as that of said subcarrier and which is to be frequency-interleaved with said quadrature two-phase balance-modulated color signal together with a carrier luminance signal, said reproducing system comprising means for separating said carrier luminance signal, said multiplexed quadrature 2-phase balancemodulated color signal and said demodulation-purpose phase signal, and means for demodulating said quadrature 2-phase balance-modulated color signals on the basis of the separated reference phase signal.
Claim 5
Independent Claim
118 words
A system for reproducing a color video signal recorded on a recording medium, said color video signal being provided by multiplexing a quadrature two-phase balance-modulated color signal obtained by subjecting a subcarrier to quadrature two-phase balanced modulation by two color signals and a demodulation-purpose reference phase signal which has the same frequency as that of said subcarrier and which is to be frequency-interleaved with said quadrature two-phase balance-modulated color signal together with a carrier luminance signal, said reproducing system comprising means for separating said carrier luminance signal, said multiplexed quadrature 2-phase balancemodulated color signal and said demodulation-purpose phase signal, and means for demodulating said quadrature 2-phase balance-modulated color signals on the basis of the separated reference phase signal.
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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |