Patent US3833760A successfully refreshed from Google Patents.
US3833760A
Expired / Lapsed
US
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Television systems
Assignee: Ferranti International PLC
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Filing: 1973-02-27
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Granted: 1974-09-03
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Expires: 1993-02-27
Abstract
Abstract A television system for producing overlay effects by replacing part of a background image by an overlay image includes a detector operable to detect the presence or absence of the overlay image during a predetermined scan line. The detector output is connected to control means operable to move the overlay image vertically to the desired position.
Inventors
- 👤 J Tickle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:54
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/272
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
A television system for producing overlay effects by replacing part of a background image by an overlay image, which includes detector means operable to detect the presence or absence of the overlay image during a predetermined scan line of the television picture, and control means responsive to the output from the detector means to change the vertical position of the overlay image in the required direction.
Claim 2
Dependent Claim
66 words
A television system for producing overlay effects by replacing part of a background image by an overlay image, which includes detector means operable to detect the presence or absence of the overlay image during a predetermined scan line of the television picture, and control means responsive to the output from the detector means to change the vertical position of the overlay image in the required direction.
Claim 3
Dependent Claim
85 words
A system as claimed in claim 1 in which the detector means includes a bistable device which is set to one of its two stable states at the beginning of the predetermined scan line and to the other of its two stable states by the presence of an overlay image during that scan line, and gating means responsive to the output of the bistable device to apply a signal to the gating means only when the overlay image is absent during said predetermined scan line.
Claim 4
Dependent Claim
55 words
A system as claimed in claim 1 in which the control means includes a correction counter to which the output of the detector means is applied and shift voltage control means responsive to the state of the correction counter to develop an appropriate shift voltage operable to vary the vertical position of the overlay image.
Claim 5
Dependent Claim
34 words
A system as claimed in claim 3 in which the shift voltage control means includes combining means for combining the shift voltage generated therein with any existing shift voltage applied to the overlay image.
Claim 6
Dependent Claim
34 words
A system as claimed in claim 3 in which the correction counter is operable to count the number of scan lines between the actual position of the overlay image and said predetermined scan line.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |