AMPLITUDE RANGE CONTROL 



523 



of possible noise improvement and also a maximum of signal modifica- 

 tion. There is, however, no information in the compressed signal 



CONTROL RATIO T 

 



INVERSE 

 COMPLETE 

 EXPANDOR 



IDEAL TRANSDUCER, 

 COMPLETE REPEATER OR 



COMPRESSOR ATTENUATOR 



COMPLETE 

 EXPANDOR 



-RANGE INVERTERS - 



♦-COMPRESSORS - 



-EXPANDORS- 



-90 -45 45 90 



ANGLE OF SLOPE IN DEGREES (FROM HORIZONTAL) 



(b) 



Fig. 2 — If transducers are classified with respect to the slope of the input-output 

 characteristics, several fields of action with definite demarcations result. 



which would serve to indicate how much compression occurred. 

 Consequently, if it were desired to restore the original range, it would 

 be necessary to transmit this information in addition to the compressed 



