US4847676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television system
Assignee: British Broadcasting Corp
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Filing: 1982-07-12
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Granted: 1989-07-11
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Expires: 2002-07-12
Abstract
Abstract In a color television signal the total line length or period and the bandwidth requirement can be conventional, but the active line period is increased to e.g. about 94% of the line period, giving an aspect ratio of about 3:2 instead of 4:3.
Inventors
- 👤 Andrew Oliphant
- 👤 Charles P. Sandbank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:14
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
In a standard color television system using a color video information signal having a standard line duration and comprising an active video information portion and a non-active video information portion, said system further having defined bandwidth requirements and a defined relationship between the picture aspect ratio thereof and the active video information portion for a given picture height, the improvement comprising a color television video signal for use in said system wherein the active video information portion occupies at least 85% of said standard line duration, whereby the picture aspect ratio is increased to a ratio greater than a 4:3 ratio without increasing said defined bandwidth requirements and without substantially changing said defined relationship.
Claim 2
Dependent Claim
114 words
In a standard color television system using a color video information signal having a standard line duration and comprising an active video information portion and a non-active video information portion, said system further having defined bandwidth requirements and a defined relationship between the picture aspect ratio thereof and the active video information portion for a given picture height, the improvement comprising a color television video signal for use in said system wherein the active video information portion occupies at least 85% of said standard line duration, whereby the picture aspect ratio is increased to a ratio greater than a 4:3 ratio without increasing said defined bandwidth requirements and without substantially changing said defined relationship.
Claim 3
Dependent Claim
28 words
A color television signal according to claim 1 and further wherein color synchronizing information is transmitted in another signal which is separate from said color television video signal.
Claim 4
Dependent Claim
22 words
A color television signal according to claim 2, in which said other signal is an audio signal for use in said system.
Claim 5
Dependent Claim
20 words
A color television system according to claim 5, in which color synchronising information is transmitted during the vertical blanking interval.
Claim 6
Dependent Claim
22 words
A color television signal according to claim 1, in which a d.c. clamping reference is transmitted during the non-active-video information portion thereof.
Claim 7
Dependent Claim
22 words
A color television signal according to claim 1 wherein said active video portion is greater than 90% of the total line duration.
Claim 8
Dependent Claim
25 words
A color television signal according to claim 1 wherein said standard line duration is about 64 microseconds and said defined bandwidth is about 5 MHz.
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Cited
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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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |