Patent ID: 7835468

Claim:
A radio receiver comprising: a processing unit configured to generate a respective phase value corresponding to each of a plurality of digital samples of a received complex frequency modulation (FM) signal; and an impulse unit configured to detect whether a linear combination of a phase value of a current sample and a phase value of one or more previous samples will produce an impulse at an output of an FM demodulator; wherein the impulse unit includes a matched filter configured to calculate and output a value corresponding to the linear combination of the phase value of the current sample and the phase value of one or more previous samples; wherein the impulse unit is further configured to calculate a difference value by subtracting the output of the FM demodulator from the value corresponding to the linear combination; and wherein in response to detecting the linear combination of the phase value of the current sample and the phase value of one or more previous samples will produce an impulse at an FM demodulation output, the impulse unit is configured to replace an output of an FM discriminator with a predetermined value.