Customer operated gain control circuit

Details Customer operated gain control circuit Customer operated gain control circuit

1974-09-30

1977-04-12

Claffy, Kathleen H.

H04B 336

Patent

active

040176959

ABSTRACT:
A customer controlled gain circuit allows a customer to control the transmission amplifier gain in a trunk circuit by means of multifrequency signals. The trunk circuit contains a multifrequency receiver which receives and decodes gain control commands. The commands are applied to a bidirectional shift register containing a single circulating bit. One gain command causes the bit to shift in one direction while another gain command causes the bit to shift in the other direction. The bit appearing at the outputs of the shift register drives a plurality of FET gate circuits which switch various feedback paths in the trunk transmission amplifier.

REFERENCES:
patent: 1586308 (1926-05-01), Homrighous
patent: 2141476 (1938-12-01), Lomax
patent: 2406053 (1946-08-01), Wright
patent: 2580709 (1952-01-01), Wicks
patent: 2653999 (1953-09-01), Wright
patent: 3141931 (1964-07-01), Zarouni
patent: 3280261 (1966-10-01), Korn
patent: 3428756 (1969-02-01), Epstein
patent: 3496309 (1970-02-01), Kalb
patent: 3573443 (1971-04-01), Fein
patent: 3806658 (1974-04-01), Anderson et al.
patent: 3821494 (1974-06-01), Besseyre

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