Patent Document ID: 4020461
Application ID: 05633148
Patent Flag: 1

Claim One:
1. The method of encoding and transmitting digital signals representing information, the digital signals including at least three groups of most important, next most important and least important bits, the method comprising the steps of: a. encoding the most important bits represented by electrical signals into an 8-ary Reed Solomon code (7,k) where k is the dimension of the code and is substantially less than 7; b. encoding the next most important bits represented by electrical signals into an 8-ary Reed Solomon code (7,k+1); c. encoding the least important bits represented by electrical signals into octal form; d. generating a plurality of subcarriers corresponding to the number of code words and octal information to be transmitted; e. differentially phase modulating each of the subcarriers with the respective code words and octal information so that the differential phases of each subcarrier are capable of assuming 8 different values; and f. transmitting the modulated subcarriers or a carrier;