分析数字FFT的实现原理，并给出其C语言程序，可以直接嵌入单片机中使用-FFT analysis of the realization of principles, and gives its C language program, can be directly embedded MCU use

一些信号分析的C 语言程序，包括随即函数、FFT等-some signal analysis of the C language programming, including then function, FFT, etc.