AMPLITUDE CHARACTERISTICS OF TELEPHONIC SIGNALS 541 



BIASED 

 CONTROL 

 CIRCUIT 



VARIO- 

 LOSSER 



GAIN 

 INCREASER 



GAIN 

 DECREASER 



BIASED 

 CONTROL 

 CIRCUIT 



GAIN INCREASE DIS" 



ABLER (BLOCKS 

 INCREASER ACTION) 



VOGAD 



BIASED 

 CONTROL 

 CIRCUIT 



VARIO- 

 LOSSER 



M 



GAIN 

 INCREASER 



A 



GAIN DE-< 

 CREASER 



GAIN INCREASE 

 DISABLER 



VARIO- 

 LOSSER 



BIASED 

 CONTROL 

 CIRCUIT 



TIME FUNCTIONS SAME 

 AS VOGAD 



GAIN CHANGES HALF 

 AS GREAT 



HALF VOGAD 



VOLUME LIMITER 

 FIGURE 3 



REGULATING 

 THRESHOLD 



COMPRESSOR 



/ \ 



EXPANDOR 



JZI 



