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
Apparatus and method for weighing an item of mail during transport through a sorting installation and having an anti-vibration device
Dynamic load profiling in a power network
Method for adapting a contact point of a clutch in a drivetrain of a motor vehicle
System for controlled release of an active principle and method for preparation
Method, apparatus, and system for energy efficiency and energy conservation including dynamic cache sizing and cache operating voltage management for optimal power performance
Method and apparatus for controllable communication
XDSL system and signal transmission method, sending device, and receiving device of xDSL system
  Randomly Featured Patents
Manually adjustable picture hanger
Self protecting hasp
Vitreous carbon-active carbon composite material, process for producing said composite material, and polarizable electrode using said composite material for use in electric double layer capaci
Pivoting lock mechanism for a computer access cover
Process of making 3-phenyl-1-methylenedioxyphenyl-indane-2-carboxylic acid derivatives
Tower crane with hammer head adaptation
Weatherstrip with uncured foot
Dual carrier immunogenic construct
Implant for osteosynthesis device with hook
Method of generating an aqueous suspension of colloidal silica