Power spectral estimation based on AR model 5.()=s(e)Ha)H（日=(es(a Let z=eio ao =l x(n)=-∑ax(n-k)+w(n,b。=l H(a) X(2 2-1 w(日)1+2a,Power spectral estimation based on AR model ( ) ( ) ( ) ( ) ( ) 2 * * 1 xx ww ww j S z S z H z H H z S z z Let z e ω   = =     = ( ) ( ) 0 0 1 1 1 ( ), 1 ( ) 1 ( ) ( ) 1 p k k p k k k a x n a x n k w n b X z H z W z a z = − = = = − − + = = = + ∑ ∑