The present invention relates to a clock phase detecting circuit and a
clock regenerating circuit each arranged in a receiving unit of multiplex
radio equipment. The receiving unit of the multiplex radio equipment
includes an identifying circuit for identifying a signal obtained by
demodulating a multilevel orthogonal modulation signal; a clock
regenerating circuit for regenerating a signal identification clock for
the identifying circuit to supply the clock to the identifying circuit;
an equalizing circuit for subjecting the signal obtained by demodulating
a multilevel orthogonal modulation signal to an equalizing process. A
clock phase detecting unit detects the phase component of the signal
identification clock based on signals input to or output from the
equalizing circuit and then supplies the phase component to the clock
regenerating circuit. The phase component of a signal identification
clock can be certainly detected and accurately adjusted so that the
signal identification clock can be regenerated with high accuracy.