研华4711a数据采集卡输出和输入界面，能够采集电压电流信号，能够输出电压和可调的频率的脉冲信号-Advantech Data Acquisition Card 4711a output and input interface, to collect voltage and current signals to the output voltage and adjustable frequency pulse signal

在心电信号的采集过程中，会引入各种干扰噪声，如基线漂移。为了得到不失真的心电信号，在诊断分析前要对信号进行预处理---数字滤波。 FIR滤波器容易实现线性相位。对于相位要求严格的场合，要求用FIR滤波器实现滤波，实验要求用用FIR高通滤波器法去除其中基线漂移。 -ECG acquisition process, will introduce all kinds of interference noise, such as baseline drift. In order to get u