单位采样序列在时域离散信号和系统中所起的作用和单位冲激函数在时域连续信号和系统中所起的作用相同，但其定义简单而精确。为方便起见，通常称该序列为离散冲激，或简称冲激，程序3.1为生成单位采样序列的MatLAB程序，生成的序列如图 3.7所示。-Action units and units of sample sequences in the time domain and the discrete signal from the system as a function of the impulse signal in the time domain and the system as a continuous function the same, but the definition is simple and accurate. For convenience, usually called the sequence of discrete impulse, or simply impulse, 3.1 units of the sampling program to generate MatLAB sequences generated sequence as shown in Figure 3.7.