Patent US3131675A successfully refreshed from Google Patents.
US4831443A
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US
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Wide band VCR with comb filter inhibition
Assignee: Zenith Electronics LLC
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Filing: 1987-09-08
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Granted: 1989-05-16
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Expires: 2007-09-08
Abstract
Abstract A super VHS VCR includes a comb filter for separating luminance and chrominance signals from a composite video signal to provide improved frequency recording characteristics. A timing circuit detects the television signal vertical interval, finds the horizontal lines that bear encoded Teletext data and inhibits comb filtering during the active video portion of the selected horizontal lines to protect any Teletext data from corruption by the comb filter action.
Inventors
- 👤 Steven J. Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:09
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/8205; H04N9/8233; H04N9/8238
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
In combination in a video system: means supplying a television signal having encoded data on one or more horizontal lines; time domain filter processing means of the comb type for receiving said television signal and, in response thereto, developing at least first and second signal components respectively reflecting video information from successive horizontal lines, and including means for combining said first and second signal components to provide a processed output signal; and means for inhibiting one of said first and second signal components during the occurrence of said encoded data.
Claim 2
Dependent Claim
90 words
In combination in a video system: means supplying a television signal having encoded data on one or more horizontal lines; time domain filter processing means of the comb type for receiving said television signal and, in response thereto, developing at least first and second signal components respectively reflecting video information from successive horizontal lines, and including means for combining said first and second signal components to provide a processed output signal; and means for inhibiting one of said first and second signal components during the occurrence of said encoded data.
Claim 3
Dependent Claim
40 words
The combination of claim 1 wherein said encoded data is Teletext data on selected horizontal lines in the vertical interval of said television signal and further including; line counting means for enabling said inhibiting means during said selected horizontal lines.
Claim 4
Dependent Claim
30 words
The combination of claim 2 wherein said selected horizontal lines include active video portions and synchronizing portions and wherein said inhibiting means is enabled only during said active video portions.
Claim 5
Dependent Claim
106 words
A VCR comprising: input means for receiving a color television signal having horizontal lines and a vertical interval, said horizontal lines including active video portions and synchronizing portions, said television signal having encoded Teletext data on selected horizontal lines in said vertical interval; comb filter means receiving said color television signal and, in response thereto, developing first and second signal components respectively reflecting video information from successive horizontal lines and including means for combining said first and second components to provide a processed output signal; and means responsive to said synchronizing portions for inhibiting one of said first and second components during said selected horizontal lines.
Claim 6
Dependent Claim
106 words
A VCR comprising: input means for receiving a color television signal having horizontal lines and a vertical interval, said horizontal lines including active video portions and synchronizing portions, said television signal having encoded Teletext data on selected horizontal lines in said vertical interval; comb filter means receiving said color television signal and, in response thereto, developing first and second signal components respectively reflecting video information from successive horizontal lines and including means for combining said first and second components to provide a processed output signal; and means responsive to said synchronizing portions for inhibiting one of said first and second components during said selected horizontal lines.
Claim 7
Dependent Claim
29 words
The VCR of claim 4 wherein said inhibiting means include: line counting means responsive to said synchronizing portions for developing an inhibit signal corresponding to said selected horizontal lines
Claim 8
Dependent Claim
54 words
The VCR of claim 5 wherein said inhibiting means further include: vertical interval detection means for detecting said vertical interval coupled to said line counting means; and duty cycle means coupled to said line counting means for controlling generation of said inhibit signal only during said active video portions of said selected horizontal lines.
Claim 9
Dependent Claim
33 words
The VCR of claim 6 wherein said duty cycle means include a pair of monostable multivibrators and a transistor for generating said inhibit signal during active video portions of said selected horizontal lines.
Claim 10
Dependent Claim
19 words
The VCR of claim 7 wherein said inhibit signal is developed on horizontal line numbers 10-18, 20 and 21.
Claim 11
Independent Claim
61 words
A method for processing a composite television signal comprising the steps of: providing a continuous composite television signal; generating a first signal having no video content during the active video portions of selected horizontal lines of said composite television signal and otherwise reflecting the chroma content thereof; and subtracting the first signal from the composite signal to provide a processed signal.
Claim 12
Independent Claim
61 words
A method for processing a composite television signal comprising the steps of: providing a continuous composite television signal; generating a first signal having no video content during the active video portions of selected horizontal lines of said composite television signal and otherwise reflecting the chroma content thereof; and subtracting the first signal from the composite signal to provide a processed signal.
References Cited (Backward Citations)
US4695900A
Cited
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| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |