Level regulator governed by a pilot tone

Details Level regulator governed by a pilot tone Level regulator governed by a pilot tone

1978-06-29

1979-06-12

Claffy, Kathleen H.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 52, 333 16, H04B 312

Patent

active

041581130

ABSTRACT:
The invention relates to transmission systems and in particular to level regulators controlled by a pilot tone and used in such systems to correct variations over a period of time in the attenuation of the transmission system.
The subject of the invention is a level regulator governed by a pilot tone whose gain control circuit locks in a mean position where there is a very low or zero value detected for the pilot tone. This locking is achieved by modifying the supply voltage of the error amplifier of the loop providing automatic gain control for the regulator.
The invention is of particular application to cable transmission systems with repeaters.

REFERENCES:
patent: 3360748 (1967-12-01), Fish et al.
patent: 3470480 (1969-09-01), Smart et al.
patent: 3766486 (1973-10-01), Ouvrier

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