假设模拟信号的最高频率为5MHz，如果每个样本量化为256个等级，则传输的数据速率是( )。
- A.10Mb／s
- B.50Mb／s
- C.80Mb／s
- D.100Mb／s
正确答案及解析
正确答案
解析
按照尼奎斯特采样定理，为了恢复原来的模拟信号，取样速率必须大于模拟信号最高频率的2倍，即
其中厂为采样频率，T为采样周期，fmax 为模拟信号的最高频率。所以当模拟信号的频率为5MHz时，采样频率必须大于l0MHz。
当样本量空间被量化为256个等级时．每个样本必须用8比特来表示。根据计算：8×10MHz=80Mb／s
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