Carrier wave recovery circuit

Details Carrier wave recovery circuit Carrier wave recovery circuit

1980-12-15

1983-11-15

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

375118, 375119, H03K 513, H03L 700, H04N 136

Patent

active

044159331

ABSTRACT:
A carrier signal recovery circuit to be used in a receiving side of an image information transmitting apparatus, such as in a facsimile system, including an N-bit counter for counting reference clock pulses for a period corresponding to 2.sup.L (L being an integer) cycle periods of the received carrier signal. A first latch holds the most significant bits from the count of the N-bit counter while a second latch holds the least significant bits from the count of the N-bit counter. A frequency divider has a frequency dividing ratio corresponding to one cycle period of the carrier signal with the value of the frequency dividing ratio being initially set by the output of the first latch circuit. An auxiliary counter receiving an input from the second latch provides an output to the frequency divider for correcting the frequency dividing ratio such that the recovered carrier signal is outputted from the frequency divider.

REFERENCES:
patent: 3938086 (1976-02-01), Valbonesi
patent: 4131856 (1978-12-01), Chapman
patent: 4280099 (1981-07-01), Rattlingourd

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