EFFICIENT rODIXG 



747 



Table I 



(These figures were computed by slide rule so the fourth figure is not very 

 significant.) 



of levels off the diagonal was the same regardless of f. In typical signals 

 this is not true. The decrease is more apt to depend on ainplitude differ- 

 ence and the finer the quantum step, the more levels a given difference 

 represents. As a result, the probability will fall off less per level off the 

 diagonal, and doubling ( will in general add one bit to H. 



On the other hand, doubling the sampling rate will not in general 

 double the required channel capacity, for the closer spaced samples will 



6.0 



5 6 7 8 9 10 20 30 40 50 60 80 100 200 



NUMBER OF LEVELS, I 



Fig. 9. 



