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
Touch-sensitive device and communication device
Materials and methods for stress reduction in semiconductor wafer passivation layers
Method for accessing wireless network
Basketball
Graphical communication user interface with graphical position user input mechanism for selecting a display image
Inhibitors of human immunodeficiency virus replication
Method of forming an isolation structure
  Randomly Featured Patents
Relevance clause for computed relevance messaging
Process for the carbonylation of pentenenitrile
Soft segment-containing modified epoxy resin and cathodic electrodeposition paints containing same
Differential timing based servo pattern for magnetic-based storage media
Reinforcement for composite material and composite material using the same
Digital pre-distortion of input signals for reducing spurious emissions in communication networks
Portable net fence
Process for continuous multi-stage polymerization of olefins
Automobile tire
Magnetic tape cartridge with removable spool