中文说明：离散时间信号有三个主要点，x[n]、h[n]和y[n]。x[n]表示初始信号，h[n]表示脉冲响应，y[n]表示卷积信号的结果。卷积过程包括反射、移位和乘法。
English Description：
Discrete-time Signal has three main points, x[n], h[n] and y[n]. x[n] referred to initial signal, h[n] referred to impulse response and y[n] is referred to result of convolution signal. Convolution process includes reflection, shifting, and multiplication. Continuous-time Signal also has three main points, x(n), h(n) and y(n). x(n) referred to initial signal, h(n) referred to impulse response and y(n) is referred to result of convolution signal. Convolution process includes reflection, shifting, and multiplication. Basically, formula for discrete-time and continous-time signal are represented as: y(n)=x(n)*h(n) ---> Continuous-time signal y[n]=x[n]*h[n] ----> Dsicrete-time signal