Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Systems, methods and computer program products supporting provision of web services using IMS
Polarity switching member of dot inversion system
Geo-coding images
Process for the preparation of ethylene homopolymers or copolymers in a high-pressure reactor controlled by a model based predictive controller
Transaction finance processing system and approach
Image capture apparatus and program
Video-recording reservation management apparatus, method, program, and system
  Randomly Featured Patents
Wire guide nozzle, wire guide nozzle unit and detaching mechanism thereof
Headphone
Film of aromatic polyethersulfone, process for the production thereof, and solution composition for the production thereof
Multi-axle vehicle suspension
Frequency standard generator synchronized with satellite or other communication network reference clocks
Information receiving and recording/reproducing apparatus/method having function for limiting/delimiting for protecting copyright of recording information
Progressively inflated packers
Transgenic mouse assay to determine the effect of A.beta. antibodies and A.beta. Fragments on alzheimer's disease characteristics
Graft copolymers and impact-resistant flame-retardant resin compositions containing the same
Positive electrode active material for a secondary battery, secondary battery and process of manufacturing positive electrode active material for a secondary battery