144 



BELL SYSTEM TECHNICAL JOURNAL 



curve 3j both as regards introduction of damping and extending the fre- 

 quency range. 



INDICIAL RESPONSt . FREQUENCY RESPONSE 



M£AS>U/?£D RECEI^EfS CHAt?ACT£ISlSTICS 



miinifl! 

 IIP™"" 



>s< 



liBSSRI!!!! 



UHI 



r.=Ef=====i: 



>s< 



r (MJcn-secoNos) 



n^QUENCr (cp!^ 



FSCQUENCr (Cf?S.) 



ftlEQUENCy (CPS.) 



L 



FIfEQuefJCr (c. ffSi 



Fig. 7 — Measured indicial response versus measured frequency response of various types 

 of telephone receivers and electrical filters. 



The effects of further increases in damping are shown by curves 4, 5, and 6. 

 Such changes in the shape of the curve are brought about by relatively simple 



