Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and apparatus for DC restoration in digital receivers










Image Number 5 for United States Patent #4873702.

A technique for eliminating unwanted dc offset voltages in a receiver for decoding a plurality of multilevel digitally modulated signals. The data transmission system is arranged to send a particular preamble signal each time a different data source begins transmission of its data. The preamble signal produces at the receiver output multiple cycles of maximum level excursions. During the period of time that the preamble signal is received, a signal processor in the receiver determines an initial dc offset value by averaging the level of the received digitally modulated signal. After the transmission of the preamble, the signal processor continually generates updated dc offset voltages which are equal to the sum of the previously generated dc offset voltage and the difference between the amplitude level represented by the received digitally modulated signal and the amplitude level of the closest "coding" amplitude level; the difference being multiplied by a scaling factor. Once a scaling factor is applied to the updated dc offset value, the result is added to the previous dc offset voltage. And, the process is continually repeated to produce updated dc offset voltages.








 
 
  Recently Added Patents
Method of forming wafer level mold using glass fiber and wafer structure formed by the same
Process for preparation of Efavirenz
Trash bag retention device
Identifying users of remote sessions
Aggregating completion messages in a sideband interface
VGPU: a real time GPU emulator
Arcuate motion control in electrostatic actuators
  Randomly Featured Patents
Circular stapler buttress
Valve drive for gas exchange valves of internal combustion engines
Snap in coupling assembly for a vehicle headlamp having a trim rim integral therewith
Folding keyboard
Nozzle for spray coating device
Hybrid channel map
Modular, optical, wet-mate connector
Waterslide bowl structure and method of construction
Image forming apparatus, user restriction method and use history generation method
Liquid activated control switch