US4979023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive comb filter for artifact-free decoding
Assignee: Individual
•
Filing: 1989-03-30
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Granted: 1990-12-18
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Expires: 2009-03-30
Abstract
Abstract An adaptive comb filter employs vertical and horizontal edge detectors to selectively activate a vertical high-pass filter and a horizontal band-pass filter during the occurrence of vertical and horizontal edges in a received television signal, for use in the chrominance/luminance separation process. Artifacts such as "hanging dots" and "crawling dots", inherent in prior art comb filter circuits during the occurrence of vertical and horizontal edges in the composite television signal, are greatly reduced in the process.
Inventors
- 👤 Mikhail Tsinberg
- 👤 Alan P. Cavallerano
- 👤 Carlo Basile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:35
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/77; H04N9/78; H03; H03H; H03H21/00; H03H21/0012; H03H21/002; H03H21/0023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
An apparatus for separating luminance and chrominance components from a composite signal, said apparatus comprising: (a) means for detecting the presence or absence of horizontal edges in said composite signal; (b) means for detecting the presence or absence of vertical edges in said composite signal; (c) means for providing vertical filtering only, to said composite signal in the presence of horizontal edges and in the absence of vertical edges; (d) means for providing both vertical and horizontal filtering in the absence of vertical and horizontal edges; and (e) means for providing horizontal filtering only, to said composite signal in the presence of both horizontal and vertical edges.
Claim 2
Independent Claim
107 words
An apparatus for separating luminance and chrominance components from a composite signal, said apparatus comprising: (a) means for detecting the presence or absence of horizontal edges in said composite signal; (b) means for detecting the presence or absence of vertical edges in said composite signal; (c) means for providing vertical filtering only, to said composite signal in the presence of horizontal edges and in the absence of vertical edges; (d) means for providing both vertical and horizontal filtering in the absence of vertical and horizontal edges; and (e) means for providing horizontal filtering only, to said composite signal in the presence of both horizontal and vertical edges.
References Cited (Backward Citations)
JPS55150688A
Cited
JPS55150687A
Cited
GB2078054A
Cited
JPS58111596A
Cited
JPS612488A
Cited
JPS61186095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |