PHASE DISTORTION IN TELEPHONE APPARATUS 



509 



600 



550 



500 



450 



in 

 (ij 



iiJ 400 



cc 

 o 



UJ 



Q 350 



I- 300 



I 



^ 250 



UJ 



200 

 150 

 100 



50 







0.2 



0.4 



0.6 



0.8 



1.0 



FREQUENCY (-fj 



1.2 



1.4 



1.6 



F"ig. 17 — -Insertion phase characteristics and schematics of low-pass filters. (/I) 

 For a filter consisting of 3 full sections, one section having no attenuation peak, one 

 with a peak at 1.25/c and another at 1.05/c. (5) Same as (/I) with the 1.05 section 

 omitted. 



10 



7 - 



«i|3 



>- 

 < 



_i 



UJ 

 Q 



0.2 



0.4 06 0.8 



FREQUENCY (-^) 



1.0 



1.2 



50 



45 



40 



Z 

 30 - 



Z 



o 



< 



D 

 20 Z 



UJ 



\- 



10 



1.6 



Fig. IS — Insertion delay and attenuation characteristics for filter .1 of Fig. 17 



