Reply by May 20, 20092009-05-20
try fdatool in matlab. It is helpful.

>I need to design a low pass filter with cut-off frequency 150Hz.since
>my algorithm involves finding the difference between the energy of the
>signal before and after passing through the filter ,I need the filter
>to have very high efficiency.
>I found ellip - 4th order to have good performance.But i need a better
>Could anyone suggest me a better filter type.
>waiting for reply
>Thanks and Regards,