AMPLITUDE RANGE CONTROL 



533 





a 



INPUT, 

 UNCOMPRESSED 



OUTPUT, COMPRESSION 

 BY IMPRESSIONS 



• OUTPUT, ENVELjOPE 

 COMPRESSION 



>0 60 70 60 90 



PER CENT OF TIME EMF IS EQUAL TO OR LESS THAN EMF SHOWN 

 (POSITIVE VALUES) 



Fig. 9 — The amplitude ranges of the compressed waves of Fig. 8 are shown, 

 together with those of Fig. 5. The amount of signal modification (and noise im- 

 provement) for any amplitude below maximum may be correlated readily with the 

 time constant. 



