Re: FIR filter design question

On Oct 10, 8:01=A0pm, "Zeph80" <surabhi_tal...@[EMAIL PROTECTED]
> wrote:
> In windowing method for FIR design, you specify the frequency response
of
> the desired filter at sample points fs/N, and perform an IDFT to obtain
> h(n).
> So doesnt this mean that you want fs to be as low as possible to specify
> better frequency resolution. But Fs is generally many times the cut-off
> frequency - more than the minimum of twice the cut off needed.
>
> Why is this?Isn't the frequency resolution that I specify for the filter
> response going to be poorer as I choose higher Fs?


Here is an actionscript program that may help you see what you are
trying to figure out:

http://www.fourier-series.com/fourierseries2/flash_programs/LowPassFIR/inde=
x.html



http://www.fourier-series.com/fourierseries2/convolution.html