US3879748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensation of timing errors in a color video signal
Assignee: US Philips Corp
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Filing: 1973-07-11
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Granted: 1975-04-22
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Expires: 1993-07-11
Abstract
Abstract A device for the compensation of timing errors in a color video signal which is derived from a record carrier, and in which the chrominance information and the luminance information cover two different frequency bands. The chrominance information is applied to a first shift register and the luminance information to a second shift register, the information contained in the upper frequency band being previously transformed to a lower frequency range. The two shift registers receive a clock signal which is derived from the same control signal. The number of elements of which the first shift register consists may be smaller than the number of elements of the second shift register; the divisor of the divider stage should then equal the ratio of the number of elements of the two shift registers.
Inventors
- 👤 Boer Jacob De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:25
CPC Classifications
G; G11; G11C; G11C27/00; G11C27/04; H; H04; H04N; H04N9/00; H04N9/79; H04N9/87; H04N9/89; H04N9/893
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
A device for the compensation of timing errors in a color video signal which is derived from a record carrier, specifically a color video signal whose chrominance information and luminance information are recorded on the record carrier in two different frequency bands, the device comprising a variable delay line which consists of a shift register, the shift register comprising a group of series-connected elements, the transfer of information from one element to the next being controlled by a variable frequency clock signal which is applied to a clock input of the shift register and whose frequency is determined by a control signal, which is obtained by comparing a synchronizing signal which is in synchronism with the color video signal and a reference signal, the improvement wherein the device comprises a first and a second shift register, means for transforming the information in the upper one of the two frequency bands to a lower frequency band means for applying the chrominance information to the first shift register, means for applying the luminance information to the second shift register, and means for deriving the clock signals for the two shift registers from said control signal.
Claim 2
Independent Claim
193 words
A device for the compensation of timing errors in a color video signal which is derived from a record carrier, specifically a color video signal whose chrominance information and luminance information are recorded on the record carrier in two different frequency bands, the device comprising a variable delay line which consists of a shift register, the shift register comprising a group of series-connected elements, the transfer of information from one element to the next being controlled by a variable frequency clock signal which is applied to a clock input of the shift register and whose frequency is determined by a control signal, which is obtained by comparing a synchronizing signal which is in synchronism with the color video signal and a reference signal, the improvement wherein the device comprises a first and a second shift register, means for transforming the information in the upper one of the two frequency bands to a lower frequency band means for applying the chrominance information to the first shift register, means for applying the luminance information to the second shift register, and means for deriving the clock signals for the two shift registers from said control signal.
Claim 3
Independent Claim
193 words
A device for the compensation of timing errors in a color video signal which is derived from a record carrier, specifically a color video signal whose chrominance information and luminance information are recorded on the record carrier in two different frequency bands, the device comprising a variable delay line which consists of a shift register, the shift register comprising a group of series-connected elements, the transfer of information from one element to the next being controlled by a variable frequency clock signal which is applied to a clock input of the shift register and whose frequency is determined by a control signal, which is obtained by comparing a synchronizing signal which is in synchronism with the color video signal and a reference signal, the improvement wherein the device comprises a first and a second shift register, means for transforming the information in the upper one of the two frequency bands to a lower frequency band means for applying the chrominance information to the first shift register, means for applying the luminance information to the second shift register, and means for deriving the clock signals for the two shift registers from said control signal.
Claim 4
Independent Claim
193 words
A device for the compensation of timing errors in a color video signal which is derived from a record carrier, specifically a color video signal whose chrominance information and luminance information are recorded on the record carrier in two different frequency bands, the device comprising a variable delay line which consists of a shift register, the shift register comprising a group of series-connected elements, the transfer of information from one element to the next being controlled by a variable frequency clock signal which is applied to a clock input of the shift register and whose frequency is determined by a control signal, which is obtained by comparing a synchronizing signal which is in synchronism with the color video signal and a reference signal, the improvement wherein the device comprises a first and a second shift register, means for transforming the information in the upper one of the two frequency bands to a lower frequency band means for applying the chrominance information to the first shift register, means for applying the luminance information to the second shift register, and means for deriving the clock signals for the two shift registers from said control signal.
Claim 5
Dependent Claim
74 words
A device as claimed in claim 1, wherein the number of elements of the first shift register is smaller than the number of elements of the second shift register and further comprising divider means for deriving the clock signal for the first shift register from the clock signal for the second shift register, the divisor of said divider means being equal to the quotient of the number of elements of the two shift registers.
Claim 6
Dependent Claim
33 words
A device as claimed in claim 2, wherein the divsor at least substantially equals the quotient of the minimum widths required for the frequency bands of the luminance information and the chrominance information.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |