GB711268A - Improvements in or relating to apparatus for televising from cinematograph film and the converse - Google Patents

Improvements in or relating to apparatus for televising from cinematograph film and the converse

Info

Publication number
GB711268A
GB711268A GB1934150A GB1934150A GB711268A GB 711268 A GB711268 A GB 711268A GB 1934150 A GB1934150 A GB 1934150A GB 1934150 A GB1934150 A GB 1934150A GB 711268 A GB711268 A GB 711268A
Authority
GB
United Kingdom
Prior art keywords
film
scanning
raster
control
sprocket holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1934150A
Inventor
Leslie Herbert Bedford
Ian Loader Whitlock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB1934150A priority Critical patent/GB711268A/en
Publication of GB711268A publication Critical patent/GB711268A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/36Scanning of motion picture films, e.g. for telecine
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B31/00Associated working of cameras or projectors with sound-recording or sound-reproducing means
    • G03B31/02Associated working of cameras or projectors with sound-recording or sound-reproducing means in which sound track is on a moving-picture film

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

711,268. Television; photo-electric control systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 22, 1951 [Aug. 2, 1950], No. 19341/50. Class 40 (3). [Also in Group XXXV] In a film scanning arrangement, either for the recording of received television pictures upon, or for the development of television picture signals from, kinema film, the scanning raster is maintained in its correct position with respect to the film frames despite the motion of the film through the gate by means of a control system involving the projection of a beam of light through the sprocket holes in the film on to a photo-cell. The invention is applicable both to continuously-advanced and intermittently-advanced systems ; in the latter type of system the invention allows following or " chasing to occur during the pull-down intervals. In one embodiment of the invention described as applied to an intermittently advanced system, a wedge-shaped "light slot" 1, Fig. 1, is focused on to the edge of the film which is blackened to prevent the passage of light except by the sprocket holes 4. The film when stationary is in the position shown and the amplitude of the corresponding current developed by the photocell is such as to effect no control on the position of the raster. During movement of the film, however, the photo-cell current is varied and exercises a varying control on the position of the raster so as to maintain it stationary with respect to the film. In a modification, Fig. 3 (not shown), the position of the slot with respect to the sprocket holes is changed so that normally the narrow tip of the slot is focused on the holes 4. In an alternative embodiment, Fig. 2, the image of a cathode-ray tube scanning spot is focused on the film and scans with respect to the sprocket holes 4 as indicated by the scanning path 6. The phase of the pulse developed as the spot passes the hole 4 is compared with that of the scanning waveform in a suitable comparator circuit and the output is used to effect both a retro-active control on the position of the auxiliary scan and a control on the position of the main raster scanning the film. A double-beam cathode-ray tube may be used to provide the main raster and auxiliary scan or alternatively two separate cathode-ray tubes together with a suitable optical system may be used. In this arrangement the edges of the film need not be blackened since by the use of limiter circuits the amplitudes of the pulses developed in the photocell may be made unimportant. The repetition rate of the auxiliary scan is preferably arranged to be an integral multiple of the line scanning frequency. By means of suitable correcting arrangements in the control circuits, the main raster may be made to follow the movement of the sprocket holes 4 accurately despite the fact that the finite gain and the presence of time constants in the loop circuit prevents the accurate following of the holes 4 by the scanning path 6.
GB1934150A 1950-08-02 1950-08-02 Improvements in or relating to apparatus for televising from cinematograph film and the converse Expired GB711268A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1934150A GB711268A (en) 1950-08-02 1950-08-02 Improvements in or relating to apparatus for televising from cinematograph film and the converse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1934150A GB711268A (en) 1950-08-02 1950-08-02 Improvements in or relating to apparatus for televising from cinematograph film and the converse

Publications (1)

Publication Number Publication Date
GB711268A true GB711268A (en) 1954-06-30

Family

ID=10127725

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1934150A Expired GB711268A (en) 1950-08-02 1950-08-02 Improvements in or relating to apparatus for televising from cinematograph film and the converse

Country Status (1)

Country Link
GB (1) GB711268A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005042A (en) * 1958-04-17 1961-10-17 David S Horsley Electronic motion picture printer
DE1562316B1 (en) * 1963-12-12 1971-01-21 Columbia Broadcasting Syst Inc Device for synchronizing the vertical scan with the film transport in a television film scanner
DE1562315B1 (en) * 1963-03-29 1971-03-25 Columbia Broadcasting Syst Inc Method for scanning information recorded on a strip-shaped recording medium in a series of fields, and recording medium for carrying out this method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005042A (en) * 1958-04-17 1961-10-17 David S Horsley Electronic motion picture printer
DE1562315B1 (en) * 1963-03-29 1971-03-25 Columbia Broadcasting Syst Inc Method for scanning information recorded on a strip-shaped recording medium in a series of fields, and recording medium for carrying out this method
DE1562316B1 (en) * 1963-12-12 1971-01-21 Columbia Broadcasting Syst Inc Device for synchronizing the vertical scan with the film transport in a television film scanner

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