Patent ID: 8055225

Claim:
A frequency modulation (FM) receiver comprising: a first mixer that downconverts an FM received signal; an intermediate frequency amplifier that amplifies the FM received signal downconverted by the first mixer; a second mixer that converts the FM received signal amplified by the intermediate frequency amplifier into an in-phase component and a quadrature component that are perpendicular to each other; an arctangent detector that generates a demodulated signal based on a result of an arctangent calculation of a ratio between the in-phase component and the quadrature component obtained from the FM received signal that are perpendicular to each other; a median filter that substitutes a median value of sample values obtained by sampling the demodulated signal generated by the arctangent detector as many times as point number for a current value of the demodulated signal, and outputs a resultant signal; a signal intensity detecting unit that detects a signal intensity of the FM received signal; and a point number altering unit that alters the point number of the median filter based on the signal intensity of the FM received signal detected by the signal intensity detecting unit.