Digital filter is the basic arithmetic of language, picture processing, model recognition and spectrum analysis.
数字滤波器是语言、图象处理、模式识别以及谱分析中的基本运算的处理运算。
It includes: stimulus of signal, analysis of signal spectrum, design of filter and PWM signal.
其中包括：激励信号的产生，信号的频谱分析，滤波器设计，PWM信号的产生等。
Analysis of frequency spectrum of human ECG using method of real-time frequency spectrum analysis and filter method is presented.
本文介绍了用实时频谱分析法和滤波器法对人体心电信息作频谱分析。
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