ZFFT(ZoomFFT) is a method used for analysis of part spectrum, it can reduce calculation.

ZFFT是对频谱局部特性进行分析的一种方法，它可降低运算量。

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If the realization of the ZFFT was based on the method of complex modulated signal or directly decomposed signal, a special equipment would be used or designed in other way.

若采用复调制法或直接抽取法等通用ZFFT法实现，一般要用专用设备或另作设计。

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