信号与系统matlab作业，实现卷积操作，供学习信号与系统的同学们参考-1. Define two signals as: x1[n] =   n, 0 < n  N1+1 2 N1 − n+ 1, N1+1 2 < n  N1 0, elsewhere and x2[n] =  1, 0 < n  N2 0, elsewhere We let N1 = 999 and