Z-80机实现低频信号实时FFT的全查表技术

Searching Table Technique about Real-Time FFT of Low Frequency Signal Based on Z-80 Microcomputer

本文介绍一种利用Z-80CPU芯片进行低频信号实时频谱分析的基本原理,着重叙述将倒序、乘积、三角函数分别制成3个不同的表格及装入大容量存储器之具体方法,从而可用简单、迅速的查表技术替代较为复杂、费时的数学运算,使得此类数据处理工作能由廉价微机予以实现。

This paper describs the basic principle of low frequency real-time FFT implemented by a Z-80 CPU chip. How to slove the problem about Bit-reversal, product and trigonometrical function is introduced in detail. It is achieved quickly by searching table mechanism instead of traditional complex methematical method. Moreover, this data processing method can be accomplished by other kind of cheap microcomputer.