Data recovery system using dot clock counting

Details Data recovery system using dot clock counting Data recovery system using dot clock counting

1991-10-18

1993-06-29

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358146, 375111, H04N 7087, H04N 708

Patent

active

052239306

ABSTRACT:
A closed caption system includes digital data on a line in the vertical blanking interval of a television signal. The line is preceded by a run-in signal of the same frequency as the data. A start bit follows the run-in signal. A high frequency dot clock is used to sample the run-in signal, and the number of dot clocks during a period of the run-in signal is used to control subsequent sampling of the data, which is initiated by the start bit.

REFERENCES:
patent: 4242755 (1980-12-01), Gauzan
patent: 4561100 (1985-12-01), Asao et al.
patent: 4620227 (1986-10-01), Levin et al.
patent: 4667235 (1987-05-01), Nozoe et al.

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