FPGA Central

faz wrote:
> Hai,
>
> I am trying to compute filter coefficients using FDA tool..
>
> For that i have choosen response type as low pass and
> choosen the design type as equiripple.I am quite confused
> to select fs,pass band frequency and stop band
> frequency(wat is the min and max range i can have??Is
> sampling frequency is related to pass band and stop band
> frequency???)

Of course they are related. Don't you know the sampling frequency and
the pass and stop band frequencies of your required filter?

>
> Though the structure is Direct form will this tool
> generate
> non-symmetric filter coefficients??

FDA tool generates symmetric or anti-symmetric filter coefficients
(ie. linear phase filters), depending on what you ask it to do.

> I guess window method
> is
> for linear phase FIR filter which generates symmetrical
> coefficients...but i am looking for non-symmetric
> coefficients..

Why are you worried about the symmetry of the coefficients? What
exactly are your design criteria for the filter?

>
> pls suggest how to proceed..

Crossposted to comp.dsp, where the topic of filter desing is discussed
regularly.

Regards,
Andor