说明：  数字信号处理的应用之一是从含有加性噪声的信号中去除噪声。现有被噪声污染的信号x[k]=s[k]+d[k]，式中： 为原始信号d[k]为均匀分布的白噪声。（1）分别产生50点的序列s[k]与白噪声序列ddd[k]，将二者叠加生成x[k]，并在同一张图上绘出x0[k]，d[k]与x[k]的序列波形。（2）均值滤波能有效去除叠加在低频信号上的噪声。已知3点滑动平均数字滤波器的单位脉冲响应为h[k]=[1，
(One of the applications of digital signal processing to remove noise from the signal with additive noise. Existing noise pollution signal x [k] = s [k] the+d [k], where: the original signal d [k] uniformly distributed white noise. (1), respectively, to produce a 50-point sequence s [k] white noise sequences ddd [k], the two superimposed to generate x [k], and plotted on the same graph x0 [k], d [k] and x [k] sequence waveform. (2) the mean filter can effectively remove noise superimposed on the low-frequency signals. Known 3-point moving average digital filter unit impulse response is h [k] = [1,)