Modem circuitry

Details Modem circuitry Modem circuitry

1980-04-03

1984-03-27

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

364150, 381108, H03G 320

Patent

active

044398646

ABSTRACT:
Automatic gain control circuitry in a modem receiver, featuring a digitally controlled gain element for imposing on the received modulated carrier signal a gain corresponding to gain control signals g received from a microprocessor, an analog-to-digital converter to provide the microprocessor with digital samples of the received modulated carrier signal, and a gain control in the microprocessor for comparing an estimate of the average level of the samples with a desired level, and generating the control signals g based on the result of the comparison.

REFERENCES:
patent: 3562504 (1971-02-01), Harris
patent: 3978407 (1976-08-01), Forney, Jr. et al.
patent: 4004226 (1975-07-01), Quresh
patent: 4085449 (1976-11-01), Wash
patent: 4222118 (1980-09-01), Dickinson et al.
patent: 4270177 (1981-05-01), Endoh
patent: 4276604 (1981-06-01), Kitamura et al.
patent: 4297527 (1981-10-01), Pate
Digital Automatic Gain Control by NASA's Jet Propulsion Laboratory, Pasadena, CA, NASA Tech. Brief, Fall 1979, vol. 4, No. 3.

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