A method for designing

M

-band cosine-modulated filter banks with near perfect reconstruction is proposed.The prototype filter is formulated as the form

A(z

L

)B(z)

and indirectly designed by varying the passband edge of

A(z)

with low order.In the course of the optimization procedure

the popular Parks-McClellan algorithm is used to design

A(z)

.A design example is presented to show that cosine-modulated filter banks with high stop attenuation can be achieved using the proposed method.