题目内容

要实现PCM数字通信，需要完成对模拟信号的处理，主要包含（）这三个步骤。

A. 抽样
B. 量化
C. 编码
D. 传输

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A律13折线PCM编码由（）组成。

A. 极性码
B. 段落码
C. 段内码
D. 汉明码

实际中，采用压扩技术实现非均匀量化，先进行压缩量化，再进行均匀量化，以达到非均匀量化的目的。

A. 对
B. 错

They haven't formally ___________ their engagement yet.

A. announce
B. announced
C. announcing
D. been announced

They ____________ that the flight would be delayed.

A. announced
B. announcing
C. announces
D. are announced