问题:
A . The three required steps in the analog to digital conversion are sampling,encoding,and compression.
B . The three required steps in the analog to digital conversion are sampling,quantization,and compression.
C . The three required steps in the analog to digital conversion are sampling,quantization,and encoding.
D . The output of the sampling process is a pulse code modulation (PCM) signal.
E . The output of the sampling process is a pulse amplitude modulation (PAM) signal.
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