PHASE DISTORTION IN TELEPHONE APPARATUS 



503 



260 CYCLES 



RECEIVED 



300 CYCLES 



RECEIVED 



Mwv^M^ 



00109 

 "SECONDS 



480 CYCLES 



680 CYCLES 



1-ig. 10 — Distortion resulting from four band filters of Fig. 9 for signals of the form 

 y sin coo/ + 6 between / = and t = T and zero for all other time. 



