New Television System


    ON October 31, Messrs. Pye, Ltd., gave a demonstration at Cambridge of a new television system recently developed by a research team under Mr. D. I. Lawson. The novel feature in this system is the utilization of the 'fly-back' times in the scanning sequence, during which the transmitter would otherwise be idle, to accommodate short pulses the duration of which can be modulated by the sound accompaniment of the television programme. At the receiving end, these width-modulated pulses are filtered out of the total transmission by an amplitude-selection process. Thus a single frequency channel is made capable of conveying both the vision and sound simultaneously; hence the name 'Videosonic' which has been given to the system.

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    New Television System. Nature 156, 565 (1945).

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