5、卷积运算 ·定义:f()*f()=f(r)f(t-t)dπ •与单位冲激信号的卷积 f(t)*δ(t-to)=f(t-t) 6、相关运算 •互相关定义: R,(④=f(x)f(r-t)dr=f(π+)f(x)dr 自相关定义: R()=()f"(r-N)dr-[f(r+D)f"(t)dr5、卷积运算 • 定义: •与单位冲激信号的卷积 6、相关运算 •互相关定义: •自相关定义: f (t)* f (t) f ( ) f (t )d 1 2 1 2 ( )* ( ) ( ) 0 0 f t t t f t t R (t) f ( ) f ( t)d f ( t) f ( )d * 1 2 * 12 1 2 R(t) f ( ) f ( t)d f ( t) f ( )d * *