话音信道的频率范围为300～3400Hz，如果采用PCM编码技术，则采样频率必须大于（）。
- A.300Hz
- B.3400Hz
- C.4000Hz
- D.6800Hz
正确答案及解析
正确答案
解析
这道题目表面上是考察PCM技术，实质上是考察采样定律，即采样频率要2倍以上于模拟信号才不失真。话音信道的频率范围为300～3400Hz，因此采样频率必须大于6800Hz。
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