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US3733432A
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US
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System for producing a continuous signal in synchronous phase with a reference signal
Assignee: Panasonic Holdings Corp
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Filing: 1969-10-08
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Granted: 1973-05-15
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Expires: 1989-10-08
Abstract
Abstract A system for producing a continuous signal in synchronous phase with the color-burst signal of a composite color television signal which is received through a transmission system subject to comparatively large time-base variations such as a VTR, said system including means for comparing in phase said burst signal with the output of an oscillator whose oscillation frequency is nearly equal to that of the burst signal, the phase of oscillation of said oscillator being adjusted according to the detected difference of the phase; characterized in that said system also includes means for detecting variation in the frequency of the synchronizing signal contained in the television signal, the frequency of said oscillator also being adjusted according to the amount of the detected variation, thereby to extend the frequency range in which said oscillator can be pulled into the synchronization; and a method for demodulating the coded color signals utilizing the above-described system.
Inventors
- 👤 I Arimura
- 👤 H Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:23
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/44; H04N9/455; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H04N9/79; H04N9/87; H04N9/898
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A system for producing a continuous signal in synchronous phase with a color burst signal of a color television signal containing said color burst signal and a periodic signal in a fixed phase relation to one of the horizontal and vertical synchronization signals of said color television signal, comprising an oscillator, the oscillation frequency of which is variable with variable means included therein and responsive to signals, means for comparing the output of said oscillator with said color burst signal as regards the frequency and the phase to produce a first error signal, means for detecting the variation in frequency of said periodic signal to produce a second error signal, means for applying said first error signal to said variable means in a closed loop, and means for applying said second error signal to said variable means in an open loop.
Claim 2
Independent Claim
141 words
A system for producing a continuous signal in synchronous phase with a color burst signal of a color television signal containing said color burst signal and a periodic signal in a fixed phase relation to one of the horizontal and vertical synchronization signals of said color television signal, comprising an oscillator, the oscillation frequency of which is variable with variable means included therein and responsive to signals, means for comparing the output of said oscillator with said color burst signal as regards the frequency and the phase to produce a first error signal, means for detecting the variation in frequency of said periodic signal to produce a second error signal, means for applying said first error signal to said variable means in a closed loop, and means for applying said second error signal to said variable means in an open loop.
Claim 3
Dependent Claim
24 words
A system as defined in claim 1, wherein said periodic synchronizing signal is the driving signal of a television signal recording and reproducing apparatus.
Claim 4
Dependent Claim
47 words
A system as defined in claim 1, wherein said means for detecting the variation in frequency of said periodic signal comprises a buffer oscillator which oscillates in synchronization with said periodic signal and a frequency detector for detecting the variation in oscillation frequency of said buffer oscillator.
Claim 5
Dependent Claim
46 words
A system as defined in claim 1, wherein said means for detecting the variation in frequency of said periodic signal comprises a triggered oscillator which is driven with said periodic signal and a frequency detector for detecting the variation in oscillation frequency of said triggered oscillator.
Claim 6
Dependent Claim
17 words
A system according to claim 1, wherein said periodic signal is the horizontal synchronization signal per se.
Claim 7
Dependent Claim
17 words
A system according to claim 1, wherein said periodic signal is the vertical synchronization signal per se.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |