Multirate filters

hi all,
I am working on polyphase filter bank design. I want some pointers on 
(i)how to avoid aliasing from other bands? 
(ii)what are the important steps while considering the design of prototype
filter?
(iii)How to avoid the amplitude distortion?
(iv)How to design filter banks with different passband widths?

thanks in advance
vanamali

On Oct 12, 7:03&#4294967295;am, "maverick.gvs" <mail2...@gmail.com> wrote:
> hi all,
> I am working on polyphase filter bank design. I want some pointers on
> (i)how to avoid aliasing from other bands?
> (ii)what are the important steps while considering the design of prototype
> filter?
> (iii)How to avoid the amplitude distortion?
what is 'amplitude distortion'?

> (iv)How to design filter banks with different passband widths?
>
> thanks in advance
> vanamali

1) aliasing can be avoid if proper bandedges are chosen, otherwise,
minimizing the aliasing should be considered.
2,3,4) chosing the right bandedges and formulating the design problem
as a optimization problem, as a function of the prototype filter.

Lin. S.