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
Lithographic apparatus and device manufacturing method
Electronic product design
Document-related representative information
Materials and methods for stress reduction in semiconductor wafer passivation layers
3D IC method and device
Image processing apparatus
Oil extractor and the preparation method thereof
  Randomly Featured Patents
Monosubstituted piperazines
Image reproducing method and apparatus capable of storing and reproducing handwriting
Method of cooking foods
Service life estimation method for lead storage battery and power source system
Versatile, electrified space dividing wall panel system
Isomerization of paraffinic hydrocarbons with fused salt complex of aluminum halide and manganous halide deposited on a carrier
Heating control system for a roller grill
Method for manufacturing, apparatus and technique for applying solid antiseptic emulsions of wax compositions and soluble extracts of vegetative plants to hair
Field-enhanced diffusion using optical activation
Device for calculating standard work time, system for managing standard work time, method for calculating standard work time, and program thereof