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【单选题】
下列关于DTFT中幅度谱和相位谱的说法，哪个是正确的？A.
离散时间信号的 DTFT 可分为幅度谱和相位谱两部分，它们也都是 ω的复函数。
B.
一个离散时间信号的幅度谱是关于ω的偶函数，相位谱是关于ω的奇函数。
C.
若一个离散时间信号的相位谱在幅度上总是在 π 和 - π 处发生折断，发生 2 π 的跳变，则很有可能是因为相位的“卷绕（ wrap ）”引起的。
D.
幅度谱和相位谱是表示离散时间信号 DTFT 的唯一一种形式。
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