Patent ID: 9503296
Filing Date: 2016-11-22
CPC Classification: H04L

Claim Text:
1. An FM receiver comprising: a local oscillator that outputs a local oscillation signal; a quadrature detector that performs a quadrature detection on the FM signal based on the local oscillation signal output by the local oscillator, and outputs an I-phase baseband signal and a Q-phase baseband signal; a corrector that corrects the I-phase baseband signal and the Q-phase baseband signal output by the quadrature detector based on a DC offset correction value; a DC offset detector that performs a polar coordinate conversion on the I-phase baseband signal and the Q-phase baseband signal corrected by the corrector, and derives the DC offset correction value in such a way that respective amplitudes in a plurality of phase domains defined on an IQ plane approximate one another; an FM detector that performs an FM detection on the I-phase baseband signal and the Q-phase baseband signal corrected by the corrector, and generates a detection signal; and a controller that controls a frequency of the local oscillation signal output by the local oscillator so as to rotate a phase component having undergone the polar coordinate conversion by the DC offset detector.