Forums

FIlter Design

Started by CH R April 5, 2003
Hi

I am implementing FIR Filtrs in Matalb. I have basic doubts in
this. Actually i know the cutoff frequencies and the Q factor for
my filter design.
I want to implement Lowpass, Bandpass and Higpass Filters(FIR).
Can you pl somebody help me out in giving the suggetions.

My approach is like this:

I am finding filter Coefficients using 'fir1(taps, w)' Matlab,
after that i am convolving my input samples with these filter
coefficients.

But in some implentations i found that we need to know stopband
frequency, stopband ripples,pass band frequncy and passband
ripples. but in the case of fir1 it is only asking no of taps and
w=cutoff/sampling.

I am expecting valuable suggetions from any one of you. Ramesh



There are many ways for filter design, following different optimization
criteria and optimization algorithms. Fir1 is probably one of them. The
"help" should give you more information on the algorithm used. Matlab
provides a number of other methods, as well.

If you are (like me) not interested in the details in algorithm, but just
want to find a satisfactory answer, I find sptool a good way to go. It lets
you choose from a few methods, and play with the parameters. The graphic
user interface shows you the results instantaneously. The result can be
exported to the workspace.

Feng -----Original Message-----
From: CH R [mailto:]
Sent: Friday, April 04, 2003 11:51 PM
To:
Subject: [matlab] FIlter Design

Hi

I am implementing FIR Filtrs in Matalb. I have basic doubts in
this. Actually i know the cutoff frequencies and the Q factor for
my filter design.
I want to implement Lowpass, Bandpass and Higpass Filters(FIR).
Can you pl somebody help me out in giving the suggetions.

My approach is like this:

I am finding filter Coefficients using 'fir1(taps, w)' Matlab,
after that i am convolving my input samples with these filter
coefficients.

But in some implentations i found that we need to know stopband
frequency, stopband ripples,pass band frequncy and passband
ripples. but in the case of fir1 it is only asking no of taps and
w=cutoff/sampling.

I am expecting valuable suggetions from any one of you. Ramesh Yahoo! Groups Sponsor

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