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 ° 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 .