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十二、数字滤波器的概念利用离散付氏变换,可以制成各种用处的滤波器及反滤波器,但它的计算工作量太大,因此在没有特别目的的时候,一般不用它来设计滤波器.大量应用于智能仪器中的通常是数字滤波器.经过取样后的输入信号,通过A/D转换后变成一组离散的数字,当然不可能用硬件来滤波,只能根据这一组离散的数字,按一定规律提出来,互相加加减减,达到滤波的目的.如何求出这些运算的规律,正是本文介绍的内容.
12, the concept of digital filter Discrete Fourier transform, can be made into a variety of useful filters and anti-filters, but its computational workload is too large, so there is no special purpose, it is generally not used to design Filter. A large number of intelligent instruments are usually used in digital filters. After sampling the input signal through the A / D conversion into a discrete number, of course, can not be used to filter hardware, only based on this The group of discrete numbers, according to a certain law put forward to each other plus and minus, to achieve the purpose of filtering.How to find the law of these operations, it is the content of this article.