k=0 8e- 日-.28门s6。 做符号代换， k'=k-1 5+j6 5-jδ 62m 3+j8 5-j8 5+j8 B.5δ) ( ) ( ) ( ) Õ( ) Õ Õ = + + = + + + - + = + + - + - = - - - = - = n k k n n k k n n n n k k n n s s j s j s s s B s s 1 2 1 1 2 1 3 1 1 1 0 2 1 d d d d d d d 做符号代换， k¢ = k -1 ( ) ( ) ( ) ( ) ( ) 2 1 0 2 2 2 1 1 0 2 2 2 1 1 0 2 3 - - ¢= - ¢+ + - ¢= - ¢+ + - ¢= ¢+ + × + - = - × × - + - = - + - - = + - = Õ Õ Õ d d d d d d d d d d d d d d d d B s s j s j s s j s j s s j s j s s j s j B s n n k n k n n k k n n k k n n