INDICIAL RESPONSE OF TELEPHONE RECEIVERS 



147 



above. This indicates the oscillatory nature of any system having a sharp 

 cutoff at the upper frequencies. 



FREQUENCY RESPONSE OF TELEPHONE RECEIVERS 

 2 



I T 



lI 



'n\ 



L-Ui I 



FRtputKCrCCP.S) 



rREflUCNCYCCRS) 



f REOUCNU (CPS) 



SQUARE WAVE RESPONSE 



TIME (SEC ) 



50 WAVES PER SEC. 



TfMECSEC) 



300 WAVES PER SEC. 



TIME (src) 



500 WAVES PER SEC. 



TIME (SEC) 



1000 WAVES PER SEC. 



Fig. 10 — Transient response to square waves of three different types of telephone 

 receivers denoted by Nos. 1, 2 and 3, whose frequency response characteristics are shown 

 above. Note the change in each type of pattern as the frequency of the square waves is 

 increased. 



