The principle of converting analog signals to digital signals became popular with the introduction of (). A.pulse code modulation B.packet switching technology C.quadrature amplitude modulation D.stored-program control

The principle of converting analog signals to digital signals became popular with the introduction of ().
A.pulse code modulation
B.packet switching technology
C.quadrature amplitude modulation
D.stored-program control

出自：河南师范大学-计算机科学与技术-专业英语

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