US3925812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colour television camera including a position corrector for at least two scanning rasters in the camera
Assignee: US Philips Corp
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Filing: 1972-05-02
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Granted: 1975-12-09
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Expires: 1992-05-02
Abstract
Abstract A colour television camera including a raster position corrector for two scanning rasters to be registered. In the position corrector the image signals from camera tubes are multiplied after delays and an error signal is generated in case of incorrect registering. The error signal is applied to a store via an integrator having a time constant which is longer than one field period, which store acts on the line field deflection coils through a current and voltage level control circuit, respectively, operative in a static manner. An aperture corrector preferably forms part of the position corrector.
Inventors
- 👤 Hendrik Blom
- 👤 Prudent Eduardus Jacobu Mollet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:30
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/10; H04N23/13; H04N23/15
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A circuit for registering a first scanning raster onto a second scanning raster, said circuit comprising a position corrector means having a pair of inputs for receiving video signals representative of said rasters respectively and an output means for supplying an error signal in accordance with any differences in registration between said rasters; means for eliminating high frequency components from said error signal comprising an integrator having an input coupled to said output means, and an output, and having a time constant at least substantially equal to one field period; and a store havIng an input coupled to said integrator output and an output means for applying a single to a deflection means whereby said registration is performed without high frequency distortion.
Claim 2
Dependent Claim
122 words
A circuit for registering a first scanning raster onto a second scanning raster, said circuit comprising a position corrector means having a pair of inputs for receiving video signals representative of said rasters respectively and an output means for supplying an error signal in accordance with any differences in registration between said rasters; means for eliminating high frequency components from said error signal comprising an integrator having an input coupled to said output means, and an output, and having a time constant at least substantially equal to one field period; and a store havIng an input coupled to said integrator output and an output means for applying a single to a deflection means whereby said registration is performed without high frequency distortion.
Claim 3
Dependent Claim
42 words
A circuit as claimed in claim 1 wherein said position corrector comprises switching means having an input means for receiving a line and field synchronization signal for switching on said position corrector during a selected portion of one of said scanning rasters.
Claim 4
Dependent Claim
77 words
A circuit as claimed in claim 1 wherein said corrector means comprises a pair of delay circuit means each having an input means for receiving one of said video signals and an output means for providing one of said video signals once and twice delayed respectively, and a series circuit coupled between said delay means output means and said integrator and including at least one multiplier means and at least one subtractor means coupled to said multiplier.
Claim 5
Dependent Claim
17 words
A circuit as claimed in claim 3 further comprising an aperture correction means comprising said delay means.
Claim 6
Dependent Claim
67 words
A circuit as claimed in claim 3 wherein said subtractor means comprises a pair of input means coupled to said pair of delay means respectively for receiving said one signal and said one signal twice delayed respectively, and said multiplier means comprises a first input means for receiving said other video signal, a second input means coupled to said subtractor, and an output coupled to said integrator.
Claim 7
Dependent Claim
86 words
A circuit as claimed as in claim 3 wherein said position corrector means comprises a vertical aperture correction means and a horizontal aperture correction means, each of said aperture correction means supplying an undelayed and twice delayed signal, and means having an input coupled to said vertical aperture correction means to receive a combination signal of said twice delayed and undelayed signals and an output means for supplying said combination signal delayed by a period equal to the delay period of said horizontal aperture correction means.
Claim 8
Dependent Claim
55 words
A circuit as claimed in claim 6 wherein said position corrector comprises two subtractor means having two pair of inputs coupled to said vertical and horizontal aperture correction means respectively, and a pair of outputs and a switch having two inputs coupled to said subtractor means outputs respectively and an output coupled to said multiplier.
References Cited (Backward Citations)
US3621122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |