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
Signal routing dependent on a loading indicator of a mobile node
Method and structure of forming backside through silicon via connections
Container
Cancer vaccines containing epitopes of oncofetal antigen
Method for manufacturing semiconductor device
Vehicle control apparatus
Method and device for reducing image color noise
  Randomly Featured Patents
Vehicle speed control circuit tester
Liquid ejection apparatus, control apparatus, and storage medium storing program
Method and circuit for eliminating major bit transition error at the bipolar zero point in a digital-to-analog converter
Foldable support device
High molecular weight polystannanes by metal-catalyzed dehydropolymerization
Utility vehicle with hinged cover element
Apparatus for carrying out analysis
Alerting a user to an occurrence of a specified event
Multistep process for the (co) polymerization of olefins
Multi-function audio system and method for controlling the same