US3708753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Producing vertical aperture correction signals for television image transmitters 08400110
Assignee: Robert Bosch Fernsehanlagen GmbH
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Filing: 1971-04-06
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Granted: 1973-01-02
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Expires: 1991-04-06
Abstract
Abstract Production of a vertical aperture correction signal for studiotype television-image transmitters. A fist video signal Ao is delayed one video line period to produce a signal A1. These signals are compared to produce a signal A1-A0, which is passed through a low-pass filter and delayed another line period to produce a signal A2-A1. Signals A1-A0 and A2-A1 are compared to produce the correction signal.
Inventors
- 👤 H Radecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:53
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
The method for producing a vertical aperture correction signal comprising delaying a video signal A0 by one video line duration to form a delayed signal A1, comparing the delayed signal A1 with signal A0 to form a signal A1-A0, delaying signal A1-A0 by one video line duration to form a delayed signal A2-A1, and comparing the signals A2-A1 and A1-A0 to form a correction signal proportional to A1- A0 + A2/2.
Claim 2
Independent Claim
71 words
The method for producing a vertical aperture correction signal comprising delaying a video signal A0 by one video line duration to form a delayed signal A1, comparing the delayed signal A1 with signal A0 to form a signal A1-A0, delaying signal A1-A0 by one video line duration to form a delayed signal A2-A1, and comparing the signals A2-A1 and A1-A0 to form a correction signal proportional to A1- A0 + A2/2.
Claim 3
Dependent Claim
15 words
The method of claim 1 further comprising passing the signal A1-A0 through a low-pass filter.
Claim 4
Independent Claim
59 words
A method for producing a vertical aperture correction signal comprising forming a difference signal A1-A0 by comparing an undelayed signal A0 and a signal A1 which has been delayed by one line period, delaying the difference A1-A0, and forming a vertical aperture correction signal A1- A0 + A2/2 by comparing the delayed signal A2-A1 and the difference signal A1-A0.
Claim 5
Independent Claim
59 words
A method for producing a vertical aperture correction signal comprising forming a difference signal A1-A0 by comparing an undelayed signal A0 and a signal A1 which has been delayed by one line period, delaying the difference A1-A0, and forming a vertical aperture correction signal A1- A0 + A2/2 by comparing the delayed signal A2-A1 and the difference signal A1-A0.
Claim 6
Dependent Claim
23 words
The method according to claim 3 further comprising restricting band width of the components of said correction signal by a common low-pass filter.
Claim 7
Dependent Claim
33 words
A method according to claim 3 wherein a degree of amplification in a first delay path is regulated by a voltage which is obtained by deriving a mean value of the difference signal.
Claim 8
Dependent Claim
64 words
A circuit for producing a vertical aperture correction comprising an input, a first time delay connected to the input, a first comparator connected to the first time delay and to the input, a second time delay connected to the first comparator, and a second comparator connected to the second time delay and to the first comparator, and an output connected to the second comparator.
Claim 9
Dependent Claim
64 words
A circuit for producing a vertical aperture correction comprising an input, a first time delay connected to the input, a first comparator connected to the first time delay and to the input, a second time delay connected to the first comparator, and a second comparator connected to the second time delay and to the first comparator, and an output connected to the second comparator.
Claim 10
Dependent Claim
49 words
The circuit of claim 6 further comprising a low-pass filter connected between the first comparator and the second time delay and connected between the first comparator and the second comparator, wherein the second time delay and the second comparator are connected to the first comparator via the low-pass filter.
Claim 11
Dependent Claim
17 words
The circuit of claim 6 wherein the first and second comparators comprise first and second differentiating amplifiers.
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |