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DESIGN PROBLEMS IN TELEVISION SYSTEMS AND RECEIVERS*
ALLEN B. DUMONT**
Summary. — A discussion is presented of the present-day television standards as adopted by the Radio Manufacturers Association, stressing their importance in relation to the design and production of television receiving equipment.
Emphasis is placed upon the limitations of the standards and the possibility of their obsolescence in the future. It is claimed that the lack of flexibility embodied therein is very likely to cause serious difficulties for the industry in the future, for the transmission of a video signal is a much more complex problem than the transmission of an audio signal as in modern radio broadcasting where standards were relatively unimportant.
As an aid to circumventing many of the limitations of the present tentative standards, a new system of television transmission standards is proposed which will greatly simplify the considerations involved in the design of television receivers.
The fundamental consideration for a system for transmitting motion pictures by radio demands in principle a system for the conversion of lights and shadows into electrical impulses, the transmission of these impulses over a distance, and their reconversion into lights and shadows with a minimum amount of distortion caused by the operation.
To accomplish this objective, standards must be set up defining the method of operation. These standards must be sufficiently definitive to provide satisfactory reproduction of the intelligence at the receiving end consistent with contemporary engineering advances. They must be flexible enough that their adoption will not prevent future improvements from being made in the art because of their rigidity and the consequent obsolescence of existing equipment and investments based upon their restrictions. Finally, the standards must be capable of providing a system for transmitting the intelligence at minimum cost and with minimum disturbance to other radio services. The last requirement demands that the radio-frequency band-width of
* Presented at the 1939 Spring Meeting at Hollywood, Calif. ; received April 14, 1939.
** Allen B. DuMont Company, Passaic, N. J.
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