CARRIER WAVE RECOVERY CIRCUIT

摘要

A carrier wave recovery circuit to be used in the receiving side of an image information transmitting apparatus, such as facsimile, includes an N-bit counter for counting reference clock pulses for a period corresponding to 2 (L is an integer) cycle periods of the carrier wave. A first latch holds the most-significant bits within the count of the N bit counter, while a second latch holds the least-significant bits within the count of the N bit counter. A frequency divider has a frequency-dividing ratio corresponding to a one-cycle period of the carrier wave, with the value of the frequency-dividing ratio being initially set by the output of the first latch. 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 wave is output from the frequency divider.