中文说明：本次实验是要我们先产生心电信号，再加噪声再滤波。由一个心电信号数据表输出心电信号，由于已知的心电信号有噪声，所以我先将信号进行滤波，得到正确的心电信号。再加噪声，通过滤波可以得到高频和中频噪声，将原信号加上噪声显示再滤波。每次的时域信号都画出了他们相应的频谱，便于观察。每次的滤波我也尝试了不同的滤波器。
English Description：
This experiment is that if we must create ECG plus noise filtering. By an ECG ECG data sheet output, because you know there is noise of ECG, so my signal is filtered before you get an accurate ECG. To add noise, can be obtained by filtering high frequency and medium frequency noise, the original signal plus noise display filter. Each of the time domain signal draws them the corresponding spectrum, for easy viewing. Filters I tried a different filter each time.