US3585293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning of cinematograph film
Assignee: CBS Broadcasting Inc
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Filing: 1969-01-21
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Granted: 1971-06-15
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Expires: 1989-01-21
Abstract
Abstract A continuously moving film has recorded thereon a succession of frames and a timing track adapted when scanned to produce a timing signal periodically varying at a frequency in fixed relation to the horizontal line scanning frequency and of one phase during part of each frame scan and of the opposite phase during a succeeding part of the frame scan. The timing signal is converted to a signal at the line scanning rate which is used to synchronize a line scan signal generator and from which is derived a reference signal at the timing signal frequency and of fixed phase. A comparator compares the timing signal with the reference signal and, when the two are in phase, provides a signal to enable a first gate to pass a synchronizing signal from a counter to a vertical or frame scanning generator to synchronize the same. The synchronizing signal also initiates a flip-flop which disables the first gate and jointly with the comparator enables a second gate a predetermined number of scanning lines after occurrence of the synchronizing signal to pass a signal from the counter to reverse the phase of the reference signal. For interlaced scan, there is recorded in the timing track a signal which effects a half line (90*) delay in the timing signal at the beginning of each film frame.
Inventors
- 👤 Norman Allison Crowder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:01
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/36; H04N3/38
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
116 words
Apparatus for reproducing film having recorded thereon a succession of frames and a timing track in relation to said frames, comprising means for moving said film continuously past a scanning zone; means for scanning said film frames at said scanning zone by a raster of lines having predetermined line scan and frame scan rates; means for scanning said timing track to generate a timing signal varying periodically at a frequency which is one-half the line scan rate; means for converting said timing signal to a line scan control signal varying periodically at said line scan rate; and means responsive to said line scan control signal for controlling the line scan rate of said film scanning means.
Claim 2
Dependent Claim
116 words
Apparatus for reproducing film having recorded thereon a succession of frames and a timing track in relation to said frames, comprising means for moving said film continuously past a scanning zone; means for scanning said film frames at said scanning zone by a raster of lines having predetermined line scan and frame scan rates; means for scanning said timing track to generate a timing signal varying periodically at a frequency which is one-half the line scan rate; means for converting said timing signal to a line scan control signal varying periodically at said line scan rate; and means responsive to said line scan control signal for controlling the line scan rate of said film scanning means.
Claim 3
Dependent Claim
125 words
Cinematograph film for use with apparatus for producing a signal representative of the film information content by scanning the film frames with a raster of lines and responsive to timing indicia on the film to synchronize operation of the scanning apparatus with the film, the film including a succession of picture frames, and an adjacent continuous time base track which has recorded therealong n X m signals per frame where n and m are integers, the signals being recorded almost entirely with a uniform spacing therebetween, the spacing between the (n-1).mth signal and the (n-1).m+1th signal differing from said uniform spacing and corresponding to a 180* phase shift in the periodic signal obtained by reproduction from the time base track at a constant film speed.
Claim 4
Dependent Claim
125 words
Cinematograph film for use with apparatus for producing a signal representative of the film information content by scanning the film frames with a raster of lines and responsive to timing indicia on the film to synchronize operation of the scanning apparatus with the film, the film including a succession of picture frames, and an adjacent continuous time base track which has recorded therealong n X m signals per frame where n and m are integers, the signals being recorded almost entirely with a uniform spacing therebetween, the spacing between the (n-1).mth signal and the (n-1).m+1th signal differing from said uniform spacing and corresponding to a 180* phase shift in the periodic signal obtained by reproduction from the time base track at a constant film speed.
Claim 5
Dependent Claim
47 words
Cinematograph film according to claim 2, wherein the spacing between the n.mth signal of one frame and the first signal of the next frame corresponds to a 90* phase shift in the periodic signal obtained by reproduction from the time base track at a constant film speed.
Claim 6
Dependent Claim
170 words
Film reproducing apparatus for reproducing film having recorded thereon a succession of frames and a timing track in relation to said frames, comprising means for moving said film continuously past a scanning zone; means for scanning said film frames at said scanning zone by a raster of lines having predetermined line scan and frame scan rates; means for scanning said timing track to generate a timing signal varying periodically at a frequency in known relation to said line scan rate; means for converting said timing signal to a signal varying periodically at said line scan rate; means responsive to said last-named signal for deriving therefrom a reference signal varying periodically at the frequency of said timing signal; comparator means connected to receive said timing signal and said reference signal and responsive to a change of phase of one with respect to the other for enabling generation of a frame scan control signal; and means responsive to said frame scan control signal for controlling the frame scan rate of said raster.
Claim 7
Dependent Claim
170 words
Film reproducing apparatus for reproducing film having recorded thereon a succession of frames and a timing track in relation to said frames, comprising means for moving said film continuously past a scanning zone; means for scanning said film frames at said scanning zone by a raster of lines having predetermined line scan and frame scan rates; means for scanning said timing track to generate a timing signal varying periodically at a frequency in known relation to said line scan rate; means for converting said timing signal to a signal varying periodically at said line scan rate; means responsive to said last-named signal for deriving therefrom a reference signal varying periodically at the frequency of said timing signal; comparator means connected to receive said timing signal and said reference signal and responsive to a change of phase of one with respect to the other for enabling generation of a frame scan control signal; and means responsive to said frame scan control signal for controlling the frame scan rate of said raster.
Claim 8
Dependent Claim
71 words
Film reproducing apparatus as defined in claim 4, together with means for counting periodic variations in said line scan control signal and generating an output signal each time an integral number of such variations is counted, the comparator means connected to receive the timing signal and the reference signal being adapted to select as a frame control signal a predetermined output signal generated by said counter after said change of phase.
Claim 9
Dependent Claim
26 words
Film reproducing apparatus as defined in claim 5, in which the frequency of said line scan control signal is twice the frequency of said timing signal.
Claim 10
Dependent Claim
77 words
Film reproducing apparatus as defined in claim 5, in which the timing signal Converter means comprises full-wave rectifier means and oscillator means synchronized by the output of said rectifier means, the reference signal deriving means is a frequency divider connected to receive an input from said oscillator means, and the comparator means includes threshold means for discriminating between spurious signals and output signals resulting from a change in phase between the timing signal and the reference signal.
Claim 11
Dependent Claim
33 words
Film reproducing apparatus as defined in claim 5, in which said integral number of periodic variations in the line scan control signal is a submultiple of the number of lines in a frame.
Claim 12
Dependent Claim
65 words
Film reproducing apparatus as defined in claim 5, together with means jointly responsive to outputs from said counting means and said comparator means and operative in an interval following each frame pulse for shifting the phase of said reference signal to restore the phase relation originally prevailing between the timing signal and the reference signal for which there is no output from the comparator means.
Claim 13
Dependent Claim
195 words
Film reproducing apparatus for reproducing film having recorded thereon a succession of frames and a timing track in relation to said frames, comprising means for moving said film continuously past a scanning zone; means for scanning said film frames at said scanning zone by a raster of lines having predetermined line scan and frame scan rates; means for scanning said timing track to generate a timing signal therein periodically at a frequency in known relation to said line scan rate; means for converting said timing signal to a line scan control signal varying periodically at said line scan rate; means responsive to said line scan control signal for controlling the line scan rate of said film frame scanning means; means responsive to said line scan control signal for deriving therefrom a reference signal varying periodically at the frequency of said timing signal; comparator means connected to receive said timing signal and said reference signal and responsive to a change in phase of one with respect to the other for enabling generation of a frame scan control signal; and means responsive to said frame scan control signal for controlling the frame scan rate of said raster.
Claim 14
Dependent Claim
195 words
Film reproducing apparatus for reproducing film having recorded thereon a succession of frames and a timing track in relation to said frames, comprising means for moving said film continuously past a scanning zone; means for scanning said film frames at said scanning zone by a raster of lines having predetermined line scan and frame scan rates; means for scanning said timing track to generate a timing signal therein periodically at a frequency in known relation to said line scan rate; means for converting said timing signal to a line scan control signal varying periodically at said line scan rate; means responsive to said line scan control signal for controlling the line scan rate of said film frame scanning means; means responsive to said line scan control signal for deriving therefrom a reference signal varying periodically at the frequency of said timing signal; comparator means connected to receive said timing signal and said reference signal and responsive to a change in phase of one with respect to the other for enabling generation of a frame scan control signal; and means responsive to said frame scan control signal for controlling the frame scan rate of said raster.
References Cited (Backward Citations)
US3402260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |