Patent US3248671A successfully refreshed from Google Patents.
Patent US3856987A successfully refreshed from Google Patents.
US3856987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Horizontal stabilizing system for film scanner
Assignee: CBS Broadcasting Inc
•
Filing: 1972-10-18
•
Granted: 1974-12-24
•
Expires: 1992-10-18
Abstract
Abstract This disclosure is applicable to an apparatus for scanning a record medium or film having a succession of data frames along its length, the frames having recorded horizontally thereon a pilot pattern of constant predetermined frequency. The apparatus includes a film transport for moving the film at a uniform rate past a scanning position, a beam scanner for scanning frames with a beam in a horizontal scanline pattern at the scanning position, and processing circuitry for deriving a pilot signal from the scanned pilot pattern. The invention comprises an improved system for continuously maintaining horizontal registration between frames being scanned and the scanning beam. This maintenance of registration effectively removes alteral weaving from the ultimately displayed picture. An oscillator is provided for generating, during horizontal scan lines, a reference signal of substantially constant frequency, the reference signal having substantially the same frequency as the pilot signal. A comparator is provided for comparing the phase of the derived pilot signal to the phase of the reference signal and for generating a correction signal in accordance with the comparison. The correction signal is applied to the beam scanner to continuously adjust the horizontal centering thereof.
Inventors
- 👤 R Mcmann
- 👤 J Petit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:02
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/11; H04N5/00; H04N5/76; H04N5/84
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
In an apparatus for scanning a record medium having a succession of data frames along its length, said frames having recorded horizontally thereon a pilot pattern of constant predetermined frequency, said apparatus including a film transport for moving said film at a substantially uniform rate past a scanning position, beam scanning means including horizontal deflection means for scanning said frames with a beam in a horizontal scanline pattern at the scanning position, and means for deriving a pilot signal from the scanned pilot pattern, an improved system for continuously maintaining horizontal registration between frames being scanned and the scanning beam comprising; means for generating, during horizontal scanlines, a reference signal of constant frequency; means for comparing the phase of the derived pilot signal to the phase of the reference signal and for generating a correction signal in accordance with the comparison; means for averaging said correction signal over a number of horizontal lines; and means for applying said correction signal to said horizontal deflection means.
Claim 2
Dependent Claim
165 words
In an apparatus for scanning a record medium having a succession of data frames along its length, said frames having recorded horizontally thereon a pilot pattern of constant predetermined frequency, said apparatus including a film transport for moving said film at a substantially uniform rate past a scanning position, beam scanning means including horizontal deflection means for scanning said frames with a beam in a horizontal scanline pattern at the scanning position, and means for deriving a pilot signal from the scanned pilot pattern, an improved system for continuously maintaining horizontal registration between frames being scanned and the scanning beam comprising; means for generating, during horizontal scanlines, a reference signal of constant frequency; means for comparing the phase of the derived pilot signal to the phase of the reference signal and for generating a correction signal in accordance with the comparison; means for averaging said correction signal over a number of horizontal lines; and means for applying said correction signal to said horizontal deflection means.
Claim 3
Dependent Claim
22 words
The system as defined by claim 1 wherein said comparing means is operative only at the approxImate center of each horizontal scanline.
Claim 4
Dependent Claim
31 words
The system as defined by claim 2 wherein said beam scanning means comprises a flying spot scanner and wherein said correction signal controls the horizontal centering of said flying spot scanner.
Claim 5
Dependent Claim
166 words
In an apparatus for scanning a record medium having a succession of data frames along its length, said frames having recorded horizontally thereon a pilot pattern of constant predetermined frequency, said apparatus including a film transport for moving said film at a substantially uniform rate past a scanning position, beam scanning means including horizontal deflection means for scanning said frames with a beam in a horizontal scanline pattern at the scanning position, and means for deriving a pilot signal from the scanned pilot pattern, an improved system for continuously maintaining horizontal registration between frames being scanned and the scanning beam comprising: means for generating, during horizontal scanlines, a reference signal of constant frequency; means for comparing the phase of the derived pilot signal to the phase of the reference signal and for generating a correction signal in accordance with the comparison, said means being operative only at the approximate center of each horizontal scanline; and means for applying said correction signal to said horizontal deflection means.
Claim 6
Dependent Claim
166 words
In an apparatus for scanning a record medium having a succession of data frames along its length, said frames having recorded horizontally thereon a pilot pattern of constant predetermined frequency, said apparatus including a film transport for moving said film at a substantially uniform rate past a scanning position, beam scanning means including horizontal deflection means for scanning said frames with a beam in a horizontal scanline pattern at the scanning position, and means for deriving a pilot signal from the scanned pilot pattern, an improved system for continuously maintaining horizontal registration between frames being scanned and the scanning beam comprising: means for generating, during horizontal scanlines, a reference signal of constant frequency; means for comparing the phase of the derived pilot signal to the phase of the reference signal and for generating a correction signal in accordance with the comparison, said means being operative only at the approximate center of each horizontal scanline; and means for applying said correction signal to said horizontal deflection means.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |