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
Screen
Apparatus, electronic component and method for generating reference voltage
Method and apparatus for providing spin-home function for mobile communication terminal
System for encrypting and decrypting a plaintext message with authentication
Dynamic data caches, decoders and decoding methods
Target trading system and method
Luggage wheel housing with wheel
  Randomly Featured Patents
Transpacitor
Implementing vertical die stacking to distribute logical function over multiple dies in through-silicon-via stacked semiconductor device
Horizontal pull slipmeter
Systems and methods for storage modeling and costing
Media weight sensor using a resonant piezoelectric element
Pulmonary diagnostic system
Active matrix array device, electronic device and operating method for an active matrix array device
Keyboard mounting mechanism
Grater set
Method of sending a short message in a digital mobile phone