US4376955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two dimensional adaptive dropout compensator and chroma inverter
Assignee: RCA Corp
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Filing: 1980-07-21
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Granted: 1983-03-15
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Expires: 2000-07-21
Abstract
Abstract A dropout compensator for time spread digital television signals uses either horizontal or vertical averaging to replace a dropped out sample. The choice of direction is made in accordance with whichever direction has the least amount of change around the missing sample or pixel. The circuitry can also be used for chroma invertion when stop or slow motion is to be transmitted or recorded.
Inventors
- 👤 Glenn A. Reitmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:06
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/87; H04N9/88; H04N9/888
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
A method for correcting dropped-out samples of recorded data, said method comprising computing the difference between samples in one direction with respect to the dropped out sample, computing the difference between samples in at least one other direction with respect to the dropped out sample, and computing an average of data from one of said directions in accordance with whichever of said differences is less.
Claim 2
Independent Claim
65 words
A method for correcting dropped-out samples of recorded data, said method comprising computing the difference between samples in one direction with respect to the dropped out sample, computing the difference between samples in at least one other direction with respect to the dropped out sample, and computing an average of data from one of said directions in accordance with whichever of said differences is less.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1 wherein said data comprises a sampled video signal.
Claim 4
Dependent Claim
34 words
A method as claimed in claim 2 wherein said video signal comprises a color video signal and the sampling of said sampled video signal occurs at a rate of four times the color subcarrier.
Claim 5
Dependent Claim
17 words
A method as claimed in claim 1 wherein said directions are orthogonal with respect to each other.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 4 wherein said directions are horizontal and vertical.
Claim 7
Independent Claim
69 words
An apparatus for correcting dropped-out samples of recorded data, said apparatus comprising means for computing the difference between samples in one direction with respect to the dropped-out sample, means for computing the difference between samples in at least one other direction with respect to the dropped-out sample, and means for computing an average of data from one of said directions in accordance with whichever of said differences is less.
Claim 8
Independent Claim
69 words
An apparatus for correcting dropped-out samples of recorded data, said apparatus comprising means for computing the difference between samples in one direction with respect to the dropped-out sample, means for computing the difference between samples in at least one other direction with respect to the dropped-out sample, and means for computing an average of data from one of said directions in accordance with whichever of said differences is less.
Claim 9
Dependent Claim
15 words
An apparatus as claimed in claim 6 wherein said data comprises a sample video signal.
Claim 10
Dependent Claim
34 words
An apparatus as claimed in claim 7 wherein said video signal comprises a color video signal and the sampling of said sampled video signal occurs at a rate of four times the color subcarrier.
Claim 11
Dependent Claim
17 words
An apparatus as claimed in claim 6 wherein said directions are orthogonal with respect to each other.
Claim 12
Dependent Claim
14 words
An apparatus as claimed in claim 9 wherein said directions are horizontal and vertical.
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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |