Noise floor automatic gain control

Details Noise floor automatic gain control Noise floor automatic gain control

1982-12-27

1984-10-23

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455247, H04B 116

Patent

active

044792549

ABSTRACT:
A noise floor automatic gain control system for radio receivers that receives a modulated signal and converts the modulated signal to a demodulated signal whose amplitude is controlled by a first gain control signal. The first gain control signal is the larger of a second automatic gain control signal that is provided by automatic gain control circuit that is activated when the demodulated signal is present, or a third automatic gain control signal that is provided by a noise floor automatic gain control circuit that is activated when the demodulated signal is not present. There is a detector circuit for detecting the presence of the demodulated signal as well as a selector circuit to select either the second automatic gain control signal or the third automatic gain control signal for the first automatic gain control signal.

REFERENCES:
patent: 2853601 (1958-09-01), McKenna et al.
patent: 2921188 (1960-01-01), Ringoen
patent: 3310745 (1967-03-01), Deasy et al.
patent: 4204172 (1980-05-01), Sadou et al.
"Single Sideband Principles and Circuits" by Pappenfus, Bruene and Schoenike McGraw-Hill Book Company, New York, 1964, Section 18-3.

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