SPECTRA OF QUANTIZED SIGNALS 



459 



The vertical line designated ''full load random noise input" represents the 

 value of noise signal power at which peaks begin to exceed the quantizing 



NOISE INPUT-SIGNAL POWER IN DECIBELS DOWN ON FULL-LOAD SINE-WAVE 

 48 44 40x 36 32 28 24 20 16 12 8 4 



Fig. 8 — Total distortion in signal band from quantizing with equal and tapered steps. 



-10 -8 -6 -4 -2 2 4 6 8 10 



POTENTIAL IN VOLTS 



Fig. 9 — Expanding characteristic applied to noise in tapered steps of Fig. (8). 



range. This occurs when the rms value of input is 9 db below the rms value 

 of the sine wave which fully loads the quantizer. 



