US3585280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gain correction apparatus for color picture information signals reproduced from a record medium
Assignee: CBS Broadcasting Inc
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Filing: 1969-06-11
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Granted: 1971-06-15
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Expires: 1989-06-11
Abstract
Abstract In the illustrative embodiment of the invention described herein, the superimposed pilot signal of a color information signal is supplied to a detector which produces a pulse each time the pilot signal crosses its zero axis. The pulses are delayed in time to align the pulses with the pilot signal at 90* from the axis crossing points and the delayed pulses are thereafter utilized to enable a sampling gate to which the pilot signal is also supplied. The output signal from the gate is smoothed and then supplied across a potentiometer to a variable gain amplifier to which the color carrier signal components of the color information signal are supplied to eliminate amplitude fluctuations in the color carrier signal components.
Inventors
- 👤 Renville H Mcmann Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:38
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/44; H04N9/455; H04N25/00; H04N25/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
A correction circuit for color information signals developed by camera means and including a first carrier component at a given frequency and a second carrier component at a frequency having a fixed relation to the given frequency comprising means for separating the first and second carrier components, detector means for detecting predetermined amplitude variations in the second carrier component for producing correction pulses, delay means for delaying the correction pulses a selected period of time with respect to the second carrier component; gate means responsive to the second carrier component and the delayed correction pulses for transmitting selective portions of the second carrier component and amplifier means responsive to the first carrier component and controlled by the selectively transmitted portions of the second carrier component for varying the amplitudes of the first carrier component in accordance with the amplitudes of the selectively transmitted portions of the second carrier component.
Claim 2
Dependent Claim
149 words
A correction circuit for color information signals developed by camera means and including a first carrier component at a given frequency and a second carrier component at a frequency having a fixed relation to the given frequency comprising means for separating the first and second carrier components, detector means for detecting predetermined amplitude variations in the second carrier component for producing correction pulses, delay means for delaying the correction pulses a selected period of time with respect to the second carrier component; gate means responsive to the second carrier component and the delayed correction pulses for transmitting selective portions of the second carrier component and amplifier means responsive to the first carrier component and controlled by the selectively transmitted portions of the second carrier component for varying the amplitudes of the first carrier component in accordance with the amplitudes of the selectively transmitted portions of the second carrier component.
Claim 3
Dependent Claim
31 words
A correction circuit according to claim 1 wherein the detector means comprises zero-crossing detector circuit means for producing a correction pulse each time the second carrier component crosses its zero axis.
Claim 4
Dependent Claim
43 words
A correction circuit according to claim 2 further comprising integrating means responsive to the selectively transmitted portions of the second carrier component for developing a substantially constant control signal and variable impedance means for varying the amplitude of the substantially constant control signal.
Claim 5
Dependent Claim
38 words
A correction circuit according to claim 3 further comprising second delay means responsive to the first carrier component for delaying the first carrier component to align in time the first carrier component with the substantially constant control signal.
Claim 6
Dependent Claim
35 words
A correction circuit according to claim 3 wherein the delay means comprises one-quarter period delay means for aligning the correction pulses with the second carrier component at 90* from the axis crossing points thereof. >
References Cited (Backward Citations)
US3479447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |