System for reproducing timing clock signal.

摘要

A timing clock reproducing system in a digital subscriber line communication for extracting an optimum phase of a clock signal, and comprising: a line equalizer (111) for shaping a waveform distorted by a transmission through a cable line; a PLL circuit (112) for generating a sampling timing control signal; an analog-to-digital converter (113) for sampling a signal received from the line equalizer at a timing controlled by the sampling timing control, and for converting the received signal into a digital signal; a decision feedback equalizer (114), for outputting tap coefficients including a precursor equalizing tap coefficient; and an evaluating function deriving means (115) for deriving an evaluating function the based the PLL circuit (112) being controlled by the valuating function for adjusting a sampling timing of the analog-to-digital converter. <IMAGE>