Impulse detection and reduction in a frequency modulation radio receiver
First Claim
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1. 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.
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Abstract
A radio receiver includes a processing unit that may generate a respective phase value corresponding to each of a plurality of digital samples of a received complex frequency modulation (FM) signal. The receiver also includes an impulse unit that may 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. If the impulse unit detects that an impulse will be produced at the output, the impulse unit may replace the output of the FM discriminator with a predetermined value.
35 Citations
15 Claims
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1. A radio receiver comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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generating a respective phase value corresponding to each of a plurality of digital samples of a received complex frequency modulation (FM) signal; and detecting 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; calculating and outputting 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; calculating a difference value by subtracting the output of the FM demodulator from the value corresponding to the linear combination; and replacing an output of an FM discriminator with a predetermined value 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 the impulse. - View Dependent Claims (11, 12, 13, 14)
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15. A radio receiver comprising:
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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 replace an output of an FM discriminator with a predetermined value in response to a determination that 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 FM demodulation output; 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; and 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.
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Specification