Operations on sequence Discrete-Time Signals and Systems--Digital Signal Processing 2.Signal multiplication Sample-by-sample multiplication Dot multiplication &{x1(n)}.{x2(n)}={x1(n)×2(n)} Function [y,n]=sigmult(x1,n1,x2,n2) n=min(min(n1),min(n2)):max(max(n1),max(n2)); y1=zeros(1,length(n));y2=y1; y1(find((n>=min(n1))&(n<=max(n1))==1))=x1; y2(find((n>=min(n2))&(n<=max(n2))==1))=x2; Y=y1.*y2; 上游充通大Operations on sequence Discrete-Time Signals and Systems —— Digital Signal Processing  Sample-by-sample multiplication  Dot multiplication  {x1(n)}.{x2(n)}={x1(n) x2(n)} Function [y,n]=sigmult(x1,n1,x2,n2) n=min(min(n1),min(n2)) : max(max(n1),max(n2)); y1=zeros(1,length(n)); y2=y1; y1(find((n>=min(n1)) & (n<=max(n1))==1))=x1; y2(find((n>=min(n2)) & (n<=max(n2))==1))=x2; Y=y1 .* y2; 2. Signal multiplication