US4903127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field generator with incomplete line correction
Assignee: Philips North America LLC
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Filing: 1989-06-23
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Granted: 1990-02-20
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Expires: 2009-06-23
Abstract
Abstract Upon receipt of an interlaced television signal, the field generator generates a first selector signal arbitrarily selecting one of the fields as top field and a second field selector signal selecting the other as bottom field. The received television signal is entered into memory under control of the field selector signals. When readout from the memory occurs on the same line that is currently being recorded, the same field selector signal is maintained for another field, effectively switching the top and bottom assignments.
Inventors
- 👤 Larry G. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:23
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/445; H04N5/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
Apparatus for receiving an interlaced signal having a first field and a second field timed by a first vertical synchronization signal and a second vertical synchronization signal respectively, and having, respectively, first lines timed by first horizontal synchronization signals and second lines timed by second horizontal synchronization signals, comprising: means for receiving said interlaced signal and generating a first field selector signal indicative of top field for an arbitrarily selected one of said first and second fields, and a second field selector signal signifying bottom field for the other of said first and second fields; memory means having a first group of memory locations and a second group of memory locations; means for recording top field information in said first memory locations and bottom field information in said second memory locations under control of said first and second field selector signals, respectively; means for reading said top field information and said bottom field information from said first and second memory locations; and means for maintaining said first field selector signal during receipt of the other of said first and second fields when said recording means and said readout means are simultaneously operative in the same one of said groups of memory locations.
Claim 2
Dependent Claim
202 words
Apparatus for receiving an interlaced signal having a first field and a second field timed by a first vertical synchronization signal and a second vertical synchronization signal respectively, and having, respectively, first lines timed by first horizontal synchronization signals and second lines timed by second horizontal synchronization signals, comprising: means for receiving said interlaced signal and generating a first field selector signal indicative of top field for an arbitrarily selected one of said first and second fields, and a second field selector signal signifying bottom field for the other of said first and second fields; memory means having a first group of memory locations and a second group of memory locations; means for recording top field information in said first memory locations and bottom field information in said second memory locations under control of said first and second field selector signals, respectively; means for reading said top field information and said bottom field information from said first and second memory locations; and means for maintaining said first field selector signal during receipt of the other of said first and second fields when said recording means and said readout means are simultaneously operative in the same one of said groups of memory locations.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |