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Patent US3746781A successfully refreshed from Google Patents.
US3746781A
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Video signal phase regulating system
Assignee: Sony Corp
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Filing: 1971-12-15
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Granted: 1973-07-17
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Expires: 1991-12-15
Abstract
Abstract In a video signal phase regulating system having at least two transmitting lines for transmitting rectangular signals with a predetermined phase relationship to each other, the rectangular signals being produced from an angular-modulated video signals, means for combining the rectangular signals, and means for detecting a phase difference between the rectangular signals in response to alteration of the phase relationship therebetween. The system is further provided with at least one variable delay means connected to one of the transmitting lines and controlled by an output signal derived from the phase difference detecting means. The delay means regulates the rectangular signals to maintain a determined phase relationship between them.
Inventors
- 👤 M Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:47
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/95
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
254 words
A video signal phase regulating system comprising: a. a plurality of transmitting means for transmitting first and second pulse signals respectively, said first and second pulse signals being angular-modulated and derived from an angularmodulated video signal which contains a synchronizing signal, the pulses of said first pulse signal each having a pulse width which is the same as the interval between the leading edges of the pulses of said video pulse signal and the pulses of said second pulse signal each having a pulse width which is the same as the interval between the trailing edges of the pulses of said video pulse signal, said first and second pulse signals being initially synchronized with said video pulse signal and having a predetermined phase relationship between them, b. variable delay means having an input and an output, said input being connected to at least one of said transmitting means, c. means connected to said output of said variable delay means for combining said first and second pulse signals to provide a composite signal, d. means for sampling that portion of said composite signal corresponding to said synchronizing signal contained in said video pulse signal to provide an error signal when the predetermined phase relationship between said first and second pulse signals changes, and e. means for producing at least one control signal in accordance with said error signal to control said variable delay means in response to said control signal to adjust said first and second pulse signals to be of the predetermined phase relationship.
Claim 2
Dependent Claim
254 words
A video signal phase regulating system comprising: a. a plurality of transmitting means for transmitting first and second pulse signals respectively, said first and second pulse signals being angular-modulated and derived from an angularmodulated video signal which contains a synchronizing signal, the pulses of said first pulse signal each having a pulse width which is the same as the interval between the leading edges of the pulses of said video pulse signal and the pulses of said second pulse signal each having a pulse width which is the same as the interval between the trailing edges of the pulses of said video pulse signal, said first and second pulse signals being initially synchronized with said video pulse signal and having a predetermined phase relationship between them, b. variable delay means having an input and an output, said input being connected to at least one of said transmitting means, c. means connected to said output of said variable delay means for combining said first and second pulse signals to provide a composite signal, d. means for sampling that portion of said composite signal corresponding to said synchronizing signal contained in said video pulse signal to provide an error signal when the predetermined phase relationship between said first and second pulse signals changes, and e. means for producing at least one control signal in accordance with said error signal to control said variable delay means in response to said control signal to adjust said first and second pulse signals to be of the predetermined phase relationship.
Claim 3
Dependent Claim
85 words
A video signal phase regulating system as claimed in claim 1, further comprising a demodulator responsive to said composite signal for producing a demodulated video signal and wherein said sampling means includes means responsive to said demodulated video signal for separating a synchronizing signal contained in said demodulated video signal, means responsive to and gated by said synchronizing signal for extracting a third signal from said composite signal representative of said synchronizing signal, and means responsive to said third signal for producing said error signal.
Claim 4
Dependent Claim
99 words
A video signal phase regulating system as claimed in claim 1, further comprising a demodulator responsive to said composite signal for producing a demodulated video signal and wherein said sampling means includes means responsive to said demodulated video signal for separating a synchronizing signal contained in said demodulated video signal, means responsive to and gated by said synchronizing signal for detecting a carrier leak contained in the synchronizing signal portion of said demodulated video signal and for producing a signal representative of said carrier leak, and means responsive to said representative carrier leak signal for producing said error signal.
Claim 5
Dependent Claim
24 words
A video signal phase regulating system as claimed in claim 1, wherein each of said plurality of transmitting means is provided with delay means.
Claim 6
Dependent Claim
35 words
A video signal phase regulating system as claimed in claim 4, wherein said control signal producing means includes a differential amplifier having differential output signals which differentially control each pair of said variable delay means.
Claim 7
Dependent Claim
104 words
A video signal phase regulating system as claimed in claim 5, wherein each of said variable delay means comprises means responsive to a separate one of said angular-modulated first and second pulse signals for producing a substantially saw-tooth wave signal, trigger means responsive to said sawtooth wave signal for producing a rectangular wave signal having a duration proportional to the time during which the sawtooth wave signal exceeds a variable trigger voltage level, and means responsive to said control signal for varying the trigger voltage level of said rectangular wave signal producing means in proportion to the amount of change of said control 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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |