此文档是本人在用DM642跑8点FFT时做的测试工作，包含浮点和定点程序之间的效率对比。-This document is my DM642 running 8:00 in use when doing FFT testing, including procedures for floating point and fixed-point comparison between the efficiency.

本示例程序演示了如何计算定点和浮点各个长度和位数的按时间抽取FFT算法。所有程序在VC6下编译通过。-This sample application demonstrates how to calculate the various fixed and floating-point and the median length of time taken by FFT algorithm. All procedures under VC6 compile.