Video frequency amplifier operable in either of two bias conditi

Details Video frequency amplifier operable in either of two bias conditi Video frequency amplifier operable in either of two bias conditi

1973-09-19

Safourek, Benedict V.

Telegraphy

Systems

Simplex-reversing periodic

178 73DC, 178DIG24, H04N 300, H04N 316

Patent

active

039365972

ABSTRACT:
A video frequency amplifier is biased to provide output signals of a first magnitude. In response to the application of a predetermined control signal, the bias is altered so that output signals are provided of a second, different magnitude. When employed in communications systems of the type in which television images are "frozen" by a storage tube for subsequent transmission on an individual frame basis by a voice-quality telephone link, for example, and subsequently re-created, the control signal indicates whether the system and its storage tube are to operate either in the "transmit" or "receive" mode.

REFERENCES:
patent: 2629010 (1953-02-01), Graham
patent: 2813148 (1957-11-01), Pensak
patent: 3204026 (1965-08-01), Doundaulakis
patent: 3628166 (1971-12-01), Harford

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