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9th April 2007, 05:19 #1
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fir filter matlab
Can anybody help to find our FIR filter design for random noise removal.

9th April 2007, 09:26 #2
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matlab noise filter
What is the type of filter you want? You can use the filter design tool box that comes with matlab (check matlab help).. A simple cammand fir will design the filter for you..
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9th April 2007, 09:26

13th April 2007, 08:48 #3
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fir matlab
What kind of signal do you use? Filter must be matched to your signal.
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13th April 2007, 08:55 #4
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fir filter matlab code
Your FIR should be a low pass in nature, but the specification has to be extracted from noise spec.

13th April 2007, 10:48 #5
matlab fir
in general cases
Find the noise variance or estimate it
use the "fspecial" to design u r quick gaussian filter
might work easily ..but it depends of the noise distribution...
If u want a real good answer....u r questions must be very specific

17th April 2007, 05:50 #6
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noise filter matlab
Originally Posted by ztanish

17th April 2007, 11:43 #7
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matlab filter noise
use fdatool in Matlab
>> fdatool
br

17th April 2007, 11:43

17th April 2007, 15:02 #8
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matlab code for fir filter
Filtering noise through a simple Low Pass filter will be a naive method but its a good step if its your first try.
As a first step check out "fir1" in matlab.
bye.

17th April 2007, 15:02

18th April 2007, 16:18 #9
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filter noise matlab
Use FDATOOL in matlab. If you type
>> fdatool
in command window, Fda tool will be opened. There you can select FIR or IIR filter, order of filter and cutoff freq. of filter (either HPF, LPF or BPF). That code will automatically generate .m file for you.
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18th April 2007, 16:47 #10
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matlab fir filter
Hi,
Try this " help firwiener " and read how to use. This is easy step to filtering noise and no need to design in "fir" function learn it as benchmark, then u should design parameter of "fir1" for filtering by yourself.

20th April 2007, 17:36 #11
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matlab fir filter design
Originally Posted by maomun
tanks for help

20th April 2007, 18:24 #12
fir filter in matlab
try using matlab for moving avg filters
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23rd April 2007, 08:39 #13
matlab program for fir filter
give ur email id i 'll send the code to u as a .m file.
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24th April 2007, 05:54 #14
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matlab fdatool
you should know what type filter matched to your apllications, LPF,BPF,or HPF, then you should know what charateristic the filter have , such as cut off frequency , ripple wave in passband and attenuation! wish it helps !

30th September 2007, 07:00 #15
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fdatool matlab
Originally Posted by ztanish
send tat to my mail id tejaswi.subash@gmail.com
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Originally Posted by cydi
my email id is tejaswi.subash@gmail.com
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Originally Posted by Unomano
my email id is tejaswi.subash@gmail.com
thank you
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Originally Posted by Unomano
my email id is tejaswi.subash@gmail.com
thank you
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Originally Posted by helios
my email id is tejaswi.subash@gmail.com
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Originally Posted by armess
Originally Posted by sprao

9th August 2009, 11:57 #16
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noise filtering matlab
clear all;
close all;
rp=input('enter the pass band ripple');
rs=input('enter the stop band ripple');
fp=input('enter the pass band ferquency');
fs=input('enter the stop band frequency');
f=input('enter the sampling frequency');
wp=2*fp/f;
ws=2*fs/f;
num=20*log10(sqrt(rp*rs))13;
dem=14.6*(fsfp)/f;
n=ceil(num/dem);
n1=n+1;
if (rem(n,2)~=0);
n1=n;
n=n1;
end
y=boxcar(n1);
b=fir1(n,wp,y);
[h,o]=freqz(b,1,256);
m=20*log10(abs(h));
subplot(2,2,1);
plot(o/pi,m);

9th August 2009, 13:03 #17
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fir filter design matlab
Originally Posted by pranchith
thanks

9th August 2009, 16:16 #18
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fir in matlab
for good results you may want to use either Kaiser's or Blackman's window. The rectangular window wold not give good attenuation in the stop band
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24th November 2009, 07:41 #19
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Re: Matlab code for FIR filter design
i want a matlab code for filter design using kaiser window

24th November 2009, 07:41

19th March 2010, 06:51 #20
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Re: Matlab code for AWGN filter
Hi all.
i have added AWGN to my speech signal, how to filter it out,?
how to know the frequency of the gaussian noise that i have added, plz do reply
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