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【单选题】
下面对量化的描述正确的是( )。A.
均匀量化时对信号的动态范围没有限制；
B.
在脉冲编码调制（ PCM ）系统中采用的就是均匀量化；
C.
均匀量化要比非均匀量化复杂的多；
D.
在相同的带宽条件下，对话音信号采用非均匀量化的效果要好于均匀量化；
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