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APPLICATION OF MOTION PICTURE FILM TO TELEVISION* E. W. ENGSTROM, G. L. BEERS, AND A. V. BEDFORD**
Summary. — Motion picture film will form an important source of programs for television broadcasting. Film projectors for this use are required to meet a number of conditions peculiar to television. Methods for projecting and utilizing motion picture film are outlined. A specific film projector and associated television channel are described in some detail.
In establishing a technicfor producing films most suitable for television, equipment is needed to interpret the final results. Apparatus that will be used by broadcasting stations is described. A simpler system has been designed that may be useful for the specialized service of gauging the merit of films for television. This is described and its operation indicated.
Some very preliminary observations are included on the characteristics of films that have given good results in experimental work and infield tests.
The production and utilization of motion picture film for television programs introduce many new problems. It is the purpose of this paper to review these problems and to describe methods and apparatus for the use of film in television.
It is desirable first to review the general characteristics of two electronic television pick-up systems that are known to give practical results. In both systems the scene to be transmitted is projected upon a photoemissive area or mosaic. The resulting "electrical image" is methodically explored by electronic means, one narrow strip or line at a time, in a process called scanning. The result of this scanning process is an electrical signal which varies in accordance with the scene brightness along the scanning lines. The information residing in this signal is used at the receiver to reconstruct the image — one element at a time — in a similar synchronized scanning process.
In one pick-up system, exemplified by equipment using the Farnsworth dissector tube, only the light falling upon an element of the photoemissive area at the instant that element is being scanned is effective in producing the signal. The other pick-up system, ex
* Presented at the 1939 Spring Meeting at Hollywood, Calif. ; received May 8, 1939.
** RCA Manufacturing Co., Catnden, N. J.
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