During the process of ZOOM-FFT, the extracting multiple of narrow band is firmly related to the final result.

在实现ZOOM - FFT算法的过程中，对窄带信号抽取的倍数直接关系到最后结果的精确度。

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A zoom - FFT implementation based on the technology of digital down convert (DDC) is introduced in this paper. The key process and core problem of this method are discussed in detail.

本文提出了一种基于数字下变频(DDC)技术的快速局部细化频谱分析的方法，并探讨了算法实现中的关键步骤和需要注意的问题。

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