Arithmetic techniques used in the highspeed front end of the multimegabit telemetry modem
Abstract
Methods of processing two's complement binary data are presented. They were used in the design of the high speed front end of the multimegabit subsystem. The first method is for rounding with zero error in the mean and is useful when large numbers of rounded values are to be accumulated. The second method consists of attaching a '1' as a least significant bit to the output word of an analog to digital converter, thus processing it as an odd number with one more bit. This compensates for the negative bias that analog to digital converters have when their zero is set for symmetrical positive and negative output ranges as is customary. When used with emitter coupled logic circuits, these methods result in simpler logic design.
 Publication:

The Deep Space Network
 Pub Date:
 April 1980
 Bibcode:
 1980dsn..nasa...85W
 Keywords:

 Analog To Digital Converters;
 Data Transmission;
 Modems;
 Signal Processing;
 Telemetry;
 Approximation;
 Binary Digits;
 Mathematical Models;
 Truncation Errors;
 Space Communications, Spacecraft Communications, Command and Tracking