Synthetic d.c. restoration of a.c. coupled signals

Details Synthetic d.c. restoration of a.c. coupled signals Synthetic d.c. restoration of a.c. coupled signals

1982-12-08

1986-03-18

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358223, 382 55, H04N 533

Patent

active

045772231

ABSTRACT:
First and second signals are selected from a plurality of sequentially fed, a.c. coupled signals. A difference signal which is the difference between the first and second signal is generated. The times during which the first signal exceeds the second, and during which the second signal exceeds the first, are determined. The larger of these two times is selected and an average of the difference signal over this larger time is generated. The average is added to the second signal. Means for implementing these steps, including an all analog embodiment are disclosed.

REFERENCES:
patent: 3634619 (1972-01-01), Astley
patent: 3751586 (1973-08-01), Johansson
patent: 3790706 (1974-02-01), Gubala et al.
patent: 3798366 (1974-03-01), Hunt et al.
patent: 3974328 (1976-08-01), Thomas et al.
patent: 4121248 (1978-10-01), Coale, Jr.
patent: 4297680 (1981-10-01), Koeman

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