AMPLITUDE CHARACTERISTICS OF TELEPHONIC SIGNALS 543 



VARIO- 

 LOSSER 



VOLTAGE = 

 K- INPUT VOLTAGE 



CONTROL 

 CIRCUIT 



LIMITED RANGE EXPANDOR 

 RADIO NOISE REDUCER 

 FIGURE 6 



AMPLITUDE 

 A 



AMPLITUDE 



AMPLI- 

 TUDE 8 



PEAK CHOPPER 

 FIGURE 9 



AMPLITUDE 



BIASED 

 CONTROL 

 CIRCUIT 



VARIO- 



LOSSER 



TWO VALUES 



OF LOSS 



CROSS-TALK SUPPRESSOR 

 FIGURE 10 



AMPLITUDE 



