TELEVISION BY PULSE CODE MODULATION 



45 



horizontal sweep generator. It will be noted that the linear input signal re- 

 sults in an amplitude quantized output signal. The one- digit system sends 



ONE DIGIT 



TWO DIGITS 



THREE DIGITS 



FOUR DIGITS 



FIVE DIGITS ORIGINAL 



Fig. 9 — Test signal, boy and bird: one to five-digit transmission. 



two levels, black and middle grey. The two-digit system sends four levels, 

 the three-digit system sends eight levels and the four and five-digit system 



