一 引言 信号处理技术是指对信号进行滤波、调制、解调、均衡及各种变换的技术。早期,对信号的处理都是采用模拟技术来实现的。模拟技术对信号进行处理存在着精度不高、稳定性较差、特性难于达到一致等弱点。在科学技术落后、工业水平低、人们在生产劳动和从事科学研究工作中需要传送和处理的信息量比较少的情况下,这些问题并不形成尖锐的矛盾,还是可以容忍的。但是,在现代化社会中,情况就不同了。现在流行一种说法,称“能源、材料和信息是现代科 An introduction Signal processing technology refers to the signal filtering, modulation, demodulation, equalization and a variety of transformation techniques. Earlier, the signal processing is the use of simulation technology to achieve. Analog signal processing there is the accuracy is not high, the stability is poor, difficult to achieve the same characteristics and other weaknesses. These problems are not sharply contradictory or tolerable in situations where science and technology are backward, industries are low, and the amount of information that needs to be transmitted and processed by people in productive work and in scientific research is relatively small. However, the situation is different in a modern society. It is fashionable to say that "energy, materials and information are modern science