Resources Contact Us Home
Demodulator for sampled data FM signals

Image Number 4 for United States Patent #4910469.

A sampled data FM demodulator samples the FM signal at intervals of (2n.pi.+.pi./2) radians relative to the FM carrier. Pairs of samples S.sub.n and S.sub.n+1 are square and multiplied together to generate sample values S.sub.n.sup.2, S.sub.n+1.sup.2 and S.sub.n S.sub.n+1. These sample values are lowpass filtered in a filter having a cutoff frequency which substantially attentuates at least the second harmonic of the FM carrier. The low pass filtered samples are then combined according to the relation S.sub.n S.sub.n+1 /.sqroot.S.sub.n.sup.2 S.sub.n+1.sup.2 to generate demodulated output samples.

  Recently Added Patents
Liquid crystal display device and control method for a bistable nematic liquid crystal display having two stable textures comprising a uniform or slightly twisted state
Method of forming top electrode for capacitor and interconnection in integrated passive device (IPD)
Systems and methods for resuming capture of a base image of an object by a mobile scanner
Package on package structures and methods for forming the same
Access methods and circuits for memory devices having multiple banks
Method and system for diagnosing operating states of a production facility
Ambidextrous mouse
  Randomly Featured Patents
Electrochemical cell structure
Human anti-human interleukin-18 antibody, fragment thereof and method for using same
Method and apparatus for high speed block mode triangle rendering
Cryogenically cooled phased array RF receiver coil for magnetic resonance imaging
Bolt connections between tubular rods and junctions in three-dimensional frameworks
Selective tissue targeting by difference frequency of two wavelengths
Production process of electronic component using wet etching, electronic component, and suspension for hard disk
Yarns of polyoxadiazole and modacrylic fibers and fabrics and garments made therefrom and methods for making same
Multi-component fibers having enhanced reversible thermal properties and methods of manufacturing thereof
Stirring device for a personal beverage container