矩形窗函数相频谱的一致性探讨

Discussion about the Phase Spectrum Uniformity of the Single Rectangular Pulse

矩形窗函数是傅立叶变换中的一个典型信号,它在信号频谱理论中占有重要地位。国内外教材中存在矩形窗函数的数种不同的相频谱图,只有少数教材中给出了简单解释,容易引起教学上的认识混乱,这显然与教科书中对相位谱重视不够有关。本文分析这一现象并提出了一些建议,希望引起大家对相频谱教学的重视,并有助于消除矩形窗函数相频谱教学中出现的一些困惑。

The single rectangular pulse is a typical signal in Fourier transform, which plays an important role in signal spectrum theory. But phase spectrum of the single rectangular pulse takes on several different results in some domestic and foreign textbooks, and only a few short interpretations exist in them. This phenomena arises from less attention to phase spectrum in the textbook, therefore inevitably causes puzzlement and confusion in teaching. With an ambition to clear up the bafflements in understanding phase spectrum of single rectangular pulse and to attract attention to phase spectrum, this paper discusses the phenomena and proposes some disposals.