AGC update apparatus and method of using same

Details AGC update apparatus and method of using same AGC update apparatus and method of using same

1983-11-16

1986-11-18

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358174, 358257, 358286, 375 8, 375 98, H04N 140

Patent

active

046239340

ABSTRACT:
A modem having automatic gain control update circuitry for use with CCITT Group II facsimile machines. The update circuitry receives incoming facsimile data samples, averages the samples for predetermined periods, compares the averages to find the maximum during each line of facsimile data, and updates a gain control to accommodate the maximum found. The update circuitry allows the modem automatic gain control to operate without the use of external synchronization strobe signals, and has an optional selectable fast automatic gain control adjustment mode.

REFERENCES:
patent: 3619493 (1971-11-01), Krallinger et al.
patent: 4355402 (1982-10-01), Kromer et al.
patent: 4453258 (1984-06-01), Richardson
patent: 4499586 (1985-02-01), Cafarella et al.
patent: 4539692 (1985-09-01), Mijmter

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