Patent US3780222A successfully refreshed from Google Patents.
US3780222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic weave compensation
Assignee: EVR ENTERPRISES
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Filing: 1972-03-13
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Granted: 1973-12-18
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Expires: 1992-03-13
Abstract
Abstract In a system for reproducing television signals from a photographic record medium in which the film is scanned by a flying spot scanner as it is transported through a film gate, apparatus for reducing the effect of lateral weave of the film as it passes through the gate. The effect of weave in the finally reproduced television signal is reduced by generating a weave compensation signal representative of the deviation of the film record medium from a standard datum, and then using that signal to effect an appropriate transverse movement of the scanning raster as to compensate for transverse movement of the film as it passes the scanning gate.
Inventors
- 👤 B Pickstock
- 👤 Neale D Manktelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:51
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
In an apparatus for scanning a film having a succession of frames disposed vertically along its length, the apparatus including a means for moving the film in a vertical direction past a scanning position, means for scanning the frames with a beam in a horizontal scanline pattern at the scanning position, photosensitive means for receiving the scanning beam and generating an electronic video signal representative of information in said frames, and display means responsive to the electronic video signal for displaying a reproduction of the information in said frames; a method of reducing horizontal weave in the displayed reproduction caused by horizontal motion of the film, comprising the steps of: a. deriving from said photosensitive means a reference signal which corresponds in time to the relative horizontal position of the frame being scanned; b. comparing the timing of said reference signal to the timing of the horizontal scanline pattern and generating a compensation signal which reflects the comparison; and c. applying the compensation signal to adjust the relative horizontal position of the display.
Claim 2
Dependent Claim
173 words
In an apparatus for scanning a film having a succession of frames disposed vertically along its length, the apparatus including a means for moving the film in a vertical direction past a scanning position, means for scanning the frames with a beam in a horizontal scanline pattern at the scanning position, photosensitive means for receiving the scanning beam and generating an electronic video signal representative of information in said frames, and display means responsive to the electronic video signal for displaying a reproduction of the information in said frames; a method of reducing horizontal weave in the displayed reproduction caused by horizontal motion of the film, comprising the steps of: a. deriving from said photosensitive means a reference signal which corresponds in time to the relative horizontal position of the frame being scanned; b. comparing the timing of said reference signal to the timing of the horizontal scanline pattern and generating a compensation signal which reflects the comparison; and c. applying the compensation signal to adjust the relative horizontal position of the display.
Claim 3
Dependent Claim
185 words
In an apparatus for scanning a film having a succession of frames and synchronization marks disposed vertically along its length, the apparatus including a means for moving the film in a vertical direction past a scanning position, means for scanning the frames with a beam in a horizontal scanline pattern at the scanning position, photosensitive means for receiving the scanning beam and generating an electronic video signal representative of information in said frames and the timing of said synchronization marks, and display means responsive to the electronic video signal for displaying a reprodUction of the information in said frames; a method of reducing horizontal weave in the displayed reproduction caused by horizontal motion of the moving film, comprising the steps of: a. deriving from said photosensitive means a reference signal which corresponds in time to the relative horizontal position of a synchronization mark being scanned; b. comparing the timing of said reference signal to the timing of the horizontal scanline pattern and generating a compensation signal which reflects the comparison; and c. applying the compensation signal to adjust the relative horizontal position of the display.
Claim 4
Dependent Claim
185 words
In an apparatus for scanning a film having a succession of frames and synchronization marks disposed vertically along its length, the apparatus including a means for moving the film in a vertical direction past a scanning position, means for scanning the frames with a beam in a horizontal scanline pattern at the scanning position, photosensitive means for receiving the scanning beam and generating an electronic video signal representative of information in said frames and the timing of said synchronization marks, and display means responsive to the electronic video signal for displaying a reprodUction of the information in said frames; a method of reducing horizontal weave in the displayed reproduction caused by horizontal motion of the moving film, comprising the steps of: a. deriving from said photosensitive means a reference signal which corresponds in time to the relative horizontal position of a synchronization mark being scanned; b. comparing the timing of said reference signal to the timing of the horizontal scanline pattern and generating a compensation signal which reflects the comparison; and c. applying the compensation signal to adjust the relative horizontal position of the display.
Claim 5
Dependent Claim
51 words
The method as defined by claim 2 wherein the step of deriving a reference signal comprises deriving a signal in the form of a pulse, the trailing edge of the pulse being determined by the point in time at which the scanning beam crosses a side edge of a synchronization mark.
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |