Patent US2567435A successfully refreshed from Google Patents.
Patent US3634615A successfully refreshed from Google Patents.
US3634615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-color eliminating apparatus for a television receiver
Assignee: Panasonic Holdings Corp
•
Filing: 1969-06-13
•
Granted: 1972-01-11
•
Expires: 1989-06-13
Abstract
Abstract A cross-color eliminating apparatus for a color television receiver. A prediction means separates luminance components from composite color video signals. Estimation means are coupled to said prediction means and estimate the possibility of cross-color interference. Control signals from said estimation means control an interruption means to interrupt the transmission of a chrominance signal during a time interval which is long enough to eliminate cross color.
Inventors
- 👤 Reiichi Sasaki
- 👤 Yoshitomi Nagaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:38
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/646
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
A cross-color eliminating apparatus for a color television receiver having a source of composite color video signals and a chrominance channel, said apparatus comprising a prediction means coupled to the source of composite color video signals for separating luminance signal components from said composite color video signals, estimation means coupled to said prediction means and including detecting means for detecting the presence of certain components in the luminance signal components which indicate the possibility of the occurrence of cross-color interference and signal producing means responsive to said detecting means for producing a control signal when the certain components are detected and cross-color interference is likely, and interruption means coupled between any two adjacent elements of the chrominance channel and which has two input terminals, one of which is coupled to the source of chrominance signals through the chrominance channel and the other of which is coupled to said estimation means, said interruption means being responsive to said control signal for interrupting the transmission of said chrominance signal for a time interval long enough to eliminate cross-color interference.
Claim 2
Dependent Claim
177 words
A cross-color eliminating apparatus for a color television receiver having a source of composite color video signals and a chrominance channel, said apparatus comprising a prediction means coupled to the source of composite color video signals for separating luminance signal components from said composite color video signals, estimation means coupled to said prediction means and including detecting means for detecting the presence of certain components in the luminance signal components which indicate the possibility of the occurrence of cross-color interference and signal producing means responsive to said detecting means for producing a control signal when the certain components are detected and cross-color interference is likely, and interruption means coupled between any two adjacent elements of the chrominance channel and which has two input terminals, one of which is coupled to the source of chrominance signals through the chrominance channel and the other of which is coupled to said estimation means, said interruption means being responsive to said control signal for interrupting the transmission of said chrominance signal for a time interval long enough to eliminate cross-color interference.
Claim 3
Dependent Claim
26 words
A cross-color eliminating apparatus as claimed in claim 1 wherein said prediction means comprises a band-pass filter centered near the low-frequency end of the chrominance sidebands.
Claim 4
Dependent Claim
64 words
A cross-color eliminating apparatus as claimed in claim 1, wherein said estimation means comprises a full wave rectifier which is coupled to said prediction means and which converts the output signal of said prediction means into a unipolar signal, and a nonlinear circuit coupled to said full wave rectifier and having a threshold level which allows only the transmission of a large unipolar signal.
Claim 5
Dependent Claim
76 words
A cross-color eliminating apparatus as claimed in claim 1 wherein said interruption means comprises a waveform shaper which is coupled to said estimation means and which shapes a pulse to have a definite width which has a duration sufficient to eliminate cross-color interference, and a gate circuit which is coupled to said waveform shaper and for preventing the transmission of a chrominance signal in the chrominance channel during a time interval determined by said pulse width.
Claim 6
Dependent Claim
25 words
An interruption means as claimed in claim 4 wherein said waveform shaper comprises a single pulse generator triggered by the output of said estimation means.
Claim 7
Dependent Claim
32 words
An interruption means as claimed in claim 4 wherein said gate circuit coupled to said waveform shaper comprises a circuit means for preventing the transmission of a color subcarrier to a demodulator.
Claim 8
Dependent Claim
150 words
A cross-color eliminating apparatus as claimed in claim 1 wherein said interruption means comprises said waveform sharper which is coupled to said estImation means and which shapes a pulse to have a definite width which has a duration sufficient to eliminate cross-color interference, an envelope detector which is coupled to a chrominance amplifier and which takes out a chrominance signal envelope, a nonlinear circuit coupled to said envelope detector having a threshold level, and a gate circuit having two control terminals, one of which is coupled to said waveform shaper for preventing the transmission of a chrominance signal in the chrominance channel during an interval determined by said pulse width and the other of which is coupled to said nonlinear circuit for allowing the transmission of a chrominance signal regardless of the output pulse of said waveform shaper whenever the amplitude of the chrominance envelope signal exceeds said threshold level.
Claim 9
Dependent Claim
25 words
An interruption means as claimed in claim 7 wherein said waveform shaper comprises a single pulse generator triggered by the output of said estimation means.
Claim 10
Dependent Claim
32 words
An interruption means as claimed in claim 7 wherein said gate circuit coupled to said waveform shaper comprises a circuit means for preventing the transmission of a color subcarrier to a demodulator.
References Cited (Backward Citations)
US2895004A
Cited
US2729698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |