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Telecine machines

  • US 4,275,422 A
  • Filed: 11/09/1978
  • Issued: 06/23/1981
  • Est. Priority Date: 11/14/1977
  • Status: Expired due to Term
First Claim
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1. A telecine machine, comprising:

  • a linear light sensor array;

    a light source;

    drive means for moving film at a constant rate between said light source and said sensor array in a direction substantially perpendicular to a plane containing said sensor array;

    optical means for imaging an illuminated section of film on said sensor array; and

    electronic means for deriving a television signal from said sensor array and for converting said signal from sequential to interlace form;

    wherein the improvement consists in that;

    said electronic means comprises first signal rate providing means for providing a first sequential-type non-standard television signal obtained by driving and scanning the film at a rate related to the film frame rate and film utilization ratio,second signal rate providing means for electronically converting said first signal to provide a second interlaced-type standard television signal having a lower line rate from said first signal, andwherein said first signal rate providing means is arranged to scan the film at a line rate which bears to the line rate of the second signal substantially the same ratio as the television picture utilization ratio bears to the film frame height utilization ratio.

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