1.2.2 Correlation /96 Correlation is widely used in communication and random signal processing y(n)=a(k)x(n+k)=a(-n)*a(n) 2021年2月 82021年2月 8 1.2.2 Correlation  Correlation is widely used in communication and random signal processing. ( ) ( ) ( ) ( )* ( ) k y n a k x n k a n a n       