Sampling clock reproducing circuit

Details Sampling clock reproducing circuit Sampling clock reproducing circuit

1983-07-19

1987-01-20

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, H04N 504

Patent

active

046383581

ABSTRACT:
A sampling clock reproducing circuit which reproduces the sampling clock for sampling character data signals from the teletext signal superposed on the vertical blanking period of television signal, which has a gate for passing signals in the vicinity of clock run-in signals, a band-pass filter, a self-excited oscillator, phase comparison circuits for comparing the band-pass filter with the self-excited oscillator in the phase of output thereof, and an oscillation output circuit comprising a phase-shift circuit controlled by the outputs of the phase comparison circuits.

REFERENCES:
patent: 3008094 (1961-11-01), Trimmer
patent: 3755617 (1973-08-01), Ichida
patent: 4051519 (1977-10-01), Harwood
patent: 4202012 (1980-05-01), Hirashima

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