Automatic determination of time base in electronic time-keeping

Details Automatic determination of time base in electronic time-keeping Automatic determination of time base in electronic time-keeping

1987-01-08

1988-08-09

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

368156, G04F 500, H04N 5262

Patent

active

047631937

ABSTRACT:
An AC line signal of unknown frequency is compared to a signal of known reference to determine the frequency of the AC line signal. Thereafter, the AC line frequency signal is used as a time-base for keeping real time.

REFERENCES:
patent: 4264967 (1981-04-01), Fujita
patent: 4464679 (1984-08-01), Wargo
patent: 4605967 (1986-08-01), Pires
Sharp Service Manual DV-1620S, p. 15.
The National Semiconductor MOS Databook, 1980, pp. 6-43 to 6-52, AN-196, "Programmable TV Timer/Time-Channel Display".

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