多选题Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？（）AThe three required steps in the analog to digital conversion are sampling，encoding，and compression.BThe three required steps in the analog to digital conversion are sampling，quantization，and compression.CThe three required steps in the analog to digital conversion are sampling，quantization，and encoding.DThe output of the sampling process is a pulse code modulation （PCM） signal.EThe output of the sampling process is a pulse amplitude modulation （PAM） signal.
多选题
Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？（）
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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