Consecutive frame scanning of cinematographic film

Abstract

A new and useful method is disclosed for transferring information from cinema film at a first speed to broadcast quality video signals at a second and different, predetermined speed which may be greater or less than the first speed, in a telecine with an internal frame store using a beam of optical information signals. This method comprises the steps of (1) transporting said film at a substantial constant speed through a raster style light beam generator at said first speed, said beam generator and film generating a beam of optical information signals; (2) forwarding said optical information signals to an internal frame store having a pulse, said frame store and pulse operating at a second and predetermined speed, said telecine having a sprocket and a capstan with a biphase tachometer attached thereto, said tachometer providing a signal, and a multibit counter means providing a count with which to measure the phrase of the sprocket relative to the frame store pulse, wherein the rate of the frame store pulse and the rate indicated by the signal from the tachometer have the ratio of two integers, to collect information from said film; and (3) outputting the information forwarded from said frame store to an external destination, wherein the difference in said first and second speeds causes selected alignment of the cinema film with the optical beam.