然而，语音信号是一个非平稳过程，因此适用于周期信号、瞬变信号或平稳随机信号的标准傅立叶变换不能用来直接表示语音信号。
But voice signal is an instable process, so standard FT that fit to the period signal and stable signal can not be express the voice signal directly.
然而，语音信号是一个非平稳过程，因此适用于周期信号、瞬变信号或平稳随机信号的标准傅立叶变换不能用来直接表示语音信号。
But voice signal is an instable process, so standard FT that fit to the period signal and stable signal can not be express the voice signal directly.
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