US4227205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hue and saturation control circuitry requiring single coupling capacitor
Assignee: Toshiba Corp
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Filing: 1977-10-14
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Granted: 1980-10-07
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Expires: 1997-10-14
Abstract
Abstract A signal-processing circuit comprises a first gate circuit, a chrominance signal amplifier, a hue control circuit, means for reproducing a composite color signal, an AC coupling capacitor, and a second gate circuit. The first gate circuit receives a composite color signal consisting of chrominance signals and burst signals which are arranged alternately and then extracts the chrominance signals and burst signals from the composite color signal. The extracted chrominance signal is amplified by the chrominance signal amplifier, while the phase of the extracted burst signal is controlled by the hue control circuit. The outputs of the chrominance signal amplifier and the hue control circuit are added by said reproducing means, thereby reproducing a composite color signal. The AC coupling capacitor is coupled to the output of said means. The second gate circuit extracts from the output of the AC coupling capacitor chrominance signals and burst signals.
Inventors
- 👤 Hiroshi Gomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:39
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/643; H04N9/44; H04N9/455
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
213 words
A composite color signal-processing circuit for processing a time-shared composite color signal including burst and chrominance signals at distinct time periods comprising: a vector signal generating circuit having an input coupled to said composite signal for generating first and second vector signals having different phases with respect to each other, said vector signal being generated during said burst signal period; a vector signal synthesizing means coupled to said vector signal generating circuit for controlling the relative absolute values of said first and second vector signals and for synthesizing said first and second controlled vector signals; a gain control circuit coupled to said composite color signal for extracting and controlling the gain of a chrominance signal from said composite color signal in response to a gate pulse; a common load coupled to the outputs of said vector signal synthesizing means and to said gain control circuit for combining their respective outputs; an AC coupling capacitor coupled to said common load for delivering an AC component of said combined outputs; a first phase detector coupled to said coupling capacitor for responding to said burst signal period in response to the gate pulse; and a second phase detector coupled to said AC coupling capacitor for responding to a chrominance signal in response to said gate pulse.
Claim 2
Dependent Claim
213 words
A composite color signal-processing circuit for processing a time-shared composite color signal including burst and chrominance signals at distinct time periods comprising: a vector signal generating circuit having an input coupled to said composite signal for generating first and second vector signals having different phases with respect to each other, said vector signal being generated during said burst signal period; a vector signal synthesizing means coupled to said vector signal generating circuit for controlling the relative absolute values of said first and second vector signals and for synthesizing said first and second controlled vector signals; a gain control circuit coupled to said composite color signal for extracting and controlling the gain of a chrominance signal from said composite color signal in response to a gate pulse; a common load coupled to the outputs of said vector signal synthesizing means and to said gain control circuit for combining their respective outputs; an AC coupling capacitor coupled to said common load for delivering an AC component of said combined outputs; a first phase detector coupled to said coupling capacitor for responding to said burst signal period in response to the gate pulse; and a second phase detector coupled to said AC coupling capacitor for responding to a chrominance signal in response to said gate pulse.
Claim 3
Dependent Claim
42 words
A composite color signal-processing circuit according to claim 1 further including means for adapting an output of said first phase detector responsive to said burst signal period as an automatic phase control signal in response to the appearance of said gate pulse.
Claim 4
Dependent Claim
41 words
A composite color signal-processing circuit according to claim 1 further including means for adapting an output of said first phase detector responding to said burst signal period as a color killer signal in response to the appearance of said gate pulse.
Claim 5
Dependent Claim
100 words
A composite color signal-processing circuit according to any one of claims 1, 2, 3 wherein said vector signal generating circuit comprises: an input terminal to which a first vector signal is supplied; a phase shifter coupled to said input terminal for producing a second vector signal; a difference vector signal generator for producing a difference vector signal from said first and second vector signals in response to said gate pulse during said burst signal period; and a gate circuit for delivering said second vector signal from said phase shifter in response to said gate pulse during said burst signal period.
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) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |