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
Systems and methods for printing images outside a normal color gamut in image forming devices
Methods and apparatus for adapting network characteristics in telecommunications systems
MEMS autofocus actuator
Method and apparatus for connecting to external device
Data processing circuit with arbitration between a plurality of queues
Representations of compressed video
Method and apparatus for controlling peak amplifier and doherty power amplifier
  Randomly Featured Patents
System for drivingly connecting gears, pulleys, wheels, rollers and other apertured components to shafts
Treatment of dementia by nerve stimulation
System for updating program stored in EEPROM by storing new version into new location and updating second transfer vector to contain starting address of new version
Pendulum switch
Dry ice cleaning method, dry ice cleaning apparatus, and part or unit cleaned by dry ice
Filament recoating apparatus and method
Footwear sole
Shaver
Method for manufacturing an endoscopic instrument
Method and apparatus for collecting vaginal fluid and exfoliated vaginal cells for diagnostic purposes