70C) 



THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1957 



((/) Variation of Cumpandint/ Improvement ivilh Volume 



Companding improvement curves are shown in Mg. 25 for representa- 

 tive members of the w-ensem})le. Each curve is tangent to the ensemble 

 upper hmit at the volume for which m = m,- . In view of its deduction 

 as the solution of the variational problem, this upper limit actually 

 represents the absolute maximum value of companding improvement 

 for the present choice of P(e). 



32 



30 



28 



26 



24 



22 



~ 20 



I- 



I 18 



LU 

 > 



O 

 a: 

 a. 



1 14 

 U 



z 



Q 

 Z 

 < 



a. 



O 



u 



SIGNAL POWER IN DECIBELS BELOW FULL LOAD SINUSOID 

 5 10 15 ■ 20 25 30 35 40 45 50 



16 



12 



10 



8 10 



20 40 60 100 200 400 600 



C 



1000 



Fig. 25 — Companding improvement curves for representative members of the 

 m-ensemble. These curves are to be compared with those for the ^-ensemble in 

 Fig 8. Note the important difference between the two ensembles for strong sig- 

 nals (small values of C) . 



