Aiming at solving the problem in current die CAD, this paper proposes a new idea developing universal and efficient die CAD system, and probes into the key techniques in detail.

针对目前模具CAD系统存在的问题，本文提出了研制通用高效模具CAD系统的新思路，并就具体的关键技术进行了详细探讨。

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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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