FM receiver

Details FM receiver FM receiver

2009-05-14

2011-11-08

Donovan, Lincoln (Department: 2816)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

C455S205000, C455S208000, C455S213000

Reexamination Certificate

active

08055225

ABSTRACT:
An arctangent detector according to the present invention generates a demodulated signal based on the result of arctangent calculation of the ratio between an in-phase component and a quadrature component obtained from a frequency modulation (FM) received signal that are perpendicular to each other. A median filter substitutes the median value of the sample values obtained by sampling the demodulated signal generated by the arctangent detector as many times as the point number for the current value of the demodulated signal and outputs a resultant signal. The point number altering unit alters the point number in the median filter based on the signal intensity of the FM received signal.

REFERENCES:
patent: 2002/0155838 (2002-10-01), Durrant et al.
patent: 2007/0281647 (2007-12-01), Corse et al.
patent: 2009/0305653 (2009-12-01), Ojima et al.
patent: 2011/0151814 (2011-06-01), Takeuchi
patent: 06-077734 (1994-03-01), None
patent: 02009296307 (2009-12-01), None

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