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US3590144A
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Chrominance subcarrier control in color television transmission
Assignee: Telefunken Patentverwertungs GmbH
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Filing: 1968-10-21
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Granted: 1971-06-29
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Expires: 1988-10-21
Abstract
Abstract A circuit for imparting to the chrominance subcarrier to a television transmitter a desired frequency and phase relationship with the horizontal synchronizing pulses of the video information signal, which circuit includes signal-processing means for deriving from the subcarrier a pulse signal which is at the horizontal synchronizing frequency and which bears the desired frequency and phase relation to the subcarrier, a phase comparator for comparing this pulse signal with the horizontal synchronizing pulses of the information signal, and control means connected between the phase comparator and the chrominance subcarrier generator for adjusting the subcarrier generator in such a manner as to bring the pulse signal into phase coincidence with the synchronizing pulses of the information signal.
Inventors
- 👤 Walter Dr Bruch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:31
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/44; H04N9/45; H04N11/00; H04N11/06; H04N11/12; H04N11/14; H04N11/16; H04N11/162
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
In a color television signal transmitter having a chrominance subcarrier generator, a circuit for controlling the chrominance subcarrier generated in the chrominance subcarrier generator to achieve a desired frequency and phase relation with the horizontal synchronizing pulses of the video information signal, said circuit comprising, in combination: generating means connected to the subcarrier generator to receive the chrominance subcarrier for deriving therefrom a pulse signal at the horizontal synchronizing pulse frequency and having such desired frequency and phase relation with the chrominance subcarrier; phase comparator means having one input connected to said generating means and another input connected to receive the horizontal synchronizing pulses of the video information signal for comparing the pulse signal produced by said generating means with the horizontal synchronizing pulses of the video information signal; and control means connected between said comparator means and the subcarrier generator for adjusting the subcarrier generator so as to bring the pulse signal and the synchronizing pulses of the video information signal into phase coincidence.
Claim 2
Dependent Claim
165 words
In a color television signal transmitter having a chrominance subcarrier generator, a circuit for controlling the chrominance subcarrier generated in the chrominance subcarrier generator to achieve a desired frequency and phase relation with the horizontal synchronizing pulses of the video information signal, said circuit comprising, in combination: generating means connected to the subcarrier generator to receive the chrominance subcarrier for deriving therefrom a pulse signal at the horizontal synchronizing pulse frequency and having such desired frequency and phase relation with the chrominance subcarrier; phase comparator means having one input connected to said generating means and another input connected to receive the horizontal synchronizing pulses of the video information signal for comparing the pulse signal produced by said generating means with the horizontal synchronizing pulses of the video information signal; and control means connected between said comparator means and the subcarrier generator for adjusting the subcarrier generator so as to bring the pulse signal and the synchronizing pulses of the video information signal into phase coincidence.
Claim 3
Dependent Claim
45 words
An arrangement as defined in claim 1, further comprising means for converting the pulse signal and the horizontal synchronizing pulses of the information signal into sinusoidal waves, each having a frequency equal to the line-scanning frequency, said sinusoidal waves being fed to said phase comparator.
Claim 4
Dependent Claim
60 words
An arrangement as defined in claim 1 for use in a standard converter for converting the television signal from a first standard to a second standard, wherein the chrominance subcarrier is produced in conformance with the second standard and is given a desired frequency and phase relation with the horizontal synchronizing pulses of the signal according to the first standard.
Claim 5
Dependent Claim
29 words
An arrangement as defined in claim 1 wherein the frequency and phase relation between the synchronizing pulses and the chrominance subcarrier is in accordance with the PAL quarter-line shift.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |