Patent ID: 8374287

Claim:
An FM (Frequency Modulation detector comprising: a quadrature detector for subjecting a received FM wave signal to quadrature detection to generate baseband I and Q signals; a phase converter for converting the baseband I and Q signals generated by the quadrature detector into a sequence of samples of phase information; a detection-result signal generator for generating an FM-detection-result signal in response to a variation between two successive samples of the phase information generated by the phase converter; a power calculator for computing a power of the baseband I and Q signals generated by the quadrature detector; a threshold-based decider for deciding whether the baseband I and Q signals are valid or invalid by referring to the power computed by the power calculator and at least one threshold value; and a signal interpolator for implementing signal interpolation with respect to the FM-detection-result signal generated by the detection-result signal generator in cases where the threshold-based decider decides that the baseband I and Q signals are invalid.