The impulse responses hk(n) of the filters in a T-channel cosine modulated filter bank may be written h k ??? ( n ) = Cp 0 ??? ( n ) ??? ??? cos ??? [ ?? 2 ??? T ??? ( 2 ??? k + 1 ) ??? ( n - N - 1 2 ) + ?? k ] , ( 19 ) where k=0, 1, . . . , T???1, N is the length of the lowpass prototype filter po(n), C is a constant and ??k is a phase-angle that ensures alias cancellation between adjacent channe