In order to improve various characteristics of a receiving circuit for
digital radio services, circuits are provided for forming two local
oscillation signals, whose frequencies are both the center frequency
between a first ensemble and a second ensemble, and whose phases differ
by 90.degree. from each other. Furthermore, there are provided mixer
circuits for frequency-converting the received signal into intermediate
frequency signals in accordance with the local oscillation signals,
phase-shift circuits to which the intermediate frequency signals are
supplied, and an addition/subtraction circuit for performing one of
addition and subtraction of the outputs of the phase-shift circuits. In
addition, there are provided intermediate frequency filters to which the
output signal of the addition/subtraction circuit is supplied and
demodulation circuits to which the output signals of the intermediate
frequency filters are supplied. By switching the process in the
addition/subtraction circuit to addition or subtraction, the signals of
the first ensemble and the second ensemble are selectively extracted from
the demodulation circuits.