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Abstract

A radio receiver in which, even with large variability in the components, the receiving conditions can be set according to the antenna input level in a uniform way. A high frequency cutoff circuit 30 reduces high frequency components in a composite signal by a high frequency cutoff ratio depending on a voltage applied to an HCC pin 30a. A principal signal included in the composite signal is demodulated by a principal signal demodulator 32, and a subsidiary signal is demodulated by a subsidiary signal demodulator 34. In the subsidiary signal demodulator 34, based on a voltage applied to a SPC pin 34a, the subsidiary signal demodulation level is varied from 0 to 100% according to stereo separation characteristics, to control the stereo separation. A matrix circuit 36 regenerates left and right channel signals from the demodulated principal signal and subsidiary signal. A microprocessor 20 inputs a signal meter output voltage from an FM detector IC 12. In a calculation unit 24, based on a signal meter output reference voltage value and a control reference voltage stored in an EEPROM 18, the signal meter output voltage peculiar to a particular unit is corrected, and an SPC and HCC voltages free of variability from unit to unit are determined according to the antenna input level and applied to the HCC pin 30a and SPC pin 34a.

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