Re: How to design FIR filter with matematical equation?

On May 23, 8:11 am, "c1910" <c_19...@hotmail.com> wrote:
> hi,
> i'm very new with DSP FIR.
> i need to make a Bandpass filter with FIR design. first, i use the AM
> signal for the input, then i want to get the information signal by
> filtering the AM signal.
> The problem is to get the value of transfer function of the FIR filter, i
> need a mathematical equation,
> i don't know where to start and what equation or theory to use?!
> can you give me an equation to start?
> or an example to design FIR filter?
> this is for my thesis, and i'm using the DSK TMS320C54...
> please give me some input...thanks...
>

You can get a mathematical equation by using a windowing method on an
ideal bandpass filter. But then what?

But for more practical concerns - why do you want to use an FIR
structure for your band pass filter? FIRs are not usually the best
thing for this. I believe that trying to directly go to a solution
without any reason for choosing said solution will lead to diaster. If
not that, then a lot of wasted time and effort. Get Rick Lyon's book
"Understanding Digital Signal Processing" and invest the time there
learning the subject. Then you will actually have a chance of getting
your thesis material to work. I truly believe that this will be your
path of least effort to success.

Clay