处理现实信号的主要原因是从中提取信号。
The primary reason for processing real-world signals is to extract information form them.
伪信号将频率有效的引入到你采集的现实信号中不存在数据中(和消除一些数据)，从而严重扭曲了原始信号。
Aliasing has the effect of introducing frequencies into your data that didn't exist in the real-world signal (and removing some that did), thereby severely distorting your signal.
数字信号处理是一种通过使用数学技巧执行转换或提取信息，来处理现实信号的方法，这些信号由数字序列表示。
Digital signal processing is a kind of method that USES mathematical skills to convert or extract information, in order to deal with the real signal which is made up of sequence of Numbers.
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