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
Mass spectrometry method
Light fixture
Prevention and reduction of blood loss
Simultaneous wafer bonding and interconnect joining
Method for decoding a spatially multiplexed data signal using a maximum likelihood detection
Cosmetic or pharmaceutical peptides containing uncoded amino acids and their use in the treatment and/or care of the skin, mucous membranes, or scalp
Generating and modifying textual code interfaces from graphical programs
  Randomly Featured Patents
Pattern measuring method
Vehicle lower grille
Hair brush applicator
Method of determining a seismic velocity profile
Method and apparatus for styling synthetic wigs
Tongs and similar article
Folded cascode amplifier with an enhanced slew rate
Process and plant for manufacturing heat-hardenable meltable mixtures such as reactive hot melt adhesives
Intelligent electric bicycle automatically operable in different modes