G50 



THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1957 



Table I — Values of e-H{h, a) for h > 



Table II — Values of I{b, a) for h < 



dimensions of (radians/sec)Vcps. The signal in the same dimensions is 

 Po or {'IwaY/fb. Therefore the ratio of the interchannel interference power 

 to the signal power is: 



P/ 

 Ps 



e~'\l{h, a) - I{ - h, a) cos 2pT] 



(17) 



The quantity e~ I{b, a) for 6 > is tabulated in Table I. The quantity 

 I{h, a) for 6 < is given in Table II. These tables, which are also given 

 in Reference 1 , are repeated here for the convenience of the reader. 



When the rms frequency deviation a is so small that h = (2x0-7')" 

 is small compared to unity, the approximation 



leads to 



P.S 



lib, a) ^ ?>V(2 - a)/4 

 (27rV(7 T')- (2 - a)(l - ros2pT)/2 



(18) 



