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FIR FIlTER DESIGN using fir1 funtion in matlab

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celhedo

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Hi,
I've been working on designing an fir filter,with the following specifications:
Sampling freq:10K
passbannd range=0-2MHz
stopband range=4k-6khz.

I've been trying to use the fir1 function,but the message is frequency should be from 0 to 1.

How do i solve this?
Thanks.
 

Dear define Order of filter.
I think MATLAB is a good teacher also use MATLAB help.
cutt of frequency is defined as
(cutt off freq/sampling rate)
try this in your function defination
 

I assume your passband is 0-2kHz and not 2MHz.
[0, 1] is referring to a normalized frequency which is [DC Fsample/2], so your Matlab function for fir1 would be..
B = fir1(order, 2e3/(10e3/2));
 
Or use the filter and design analysis toolbox in matlab. Type fdatool in matlab.
 

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