check out sptool ,fdatool and filter. Mandar --- wrote: > Hi Everyone.....Well this is Nitin here and I am doing my MS from > the > University of Hartford. > Actually , I wanted to know, suppose I have designed a Butterworth > filterusing the "Butter" command in Matlab and "Buttord" for > finding > the order of the Filter ... > Now I got the Frequency response by using the "Freqz" command. > Now I want to test the filter using a test signal in the passband > frequecy, how should I generate the test signal and then finally > analyze the filter....how the Filter behaves with the Test Signal. > Thanks > Nitin > ===== - Its not life that weighs us down, Its how we carry it. __________________________________

Hi Nitin! I sugest random sequence, white Gaussian noise: x=randn(1024,1); LP filter is: L=7; F=0.2; [B,A]=butter(L,2*F); y is filtered signal y=filter(B,A,x); Spectrums of original (x) and filtered signal are performed by FFT: Xt(x); Xas(X); Yt(y); Yas(Y); Plotting of amplitude spectrums: plot(Xa); plot(Ya); Regards Predrag Valozic ----- Original Message ----- From: <> To: <> Sent: 2003. prosinac 16 13:04 Subject: [matlab] Test Signal !! > Hi Everyone.....Well this is Nitin here and I am doing my MS from the > University of Hartford. > Actually , I wanted to know, suppose I have designed a Butterworth > filterusing the "Butter" command in Matlab and "Buttord" for finding > the order of the Filter ... > Now I got the Frequency response by using the "Freqz" command. > Now I want to test the filter using a test signal in the passband > frequecy, how should I generate the test signal and then finally > analyze the filter....how the Filter behaves with the Test Signal. > Thanks > Nitin > > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: > > To Post: > > To Leave: > > Archives: http://www.yahoogroups.com/group/matlab > > More DSP-Related Groups: http://www.dsprelated.com/groups.php3

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Hi Everyone.....Well this is Nitin here and I am doing my MS from the University of Hartford. Actually , I wanted to know, suppose I have designed a Butterworth filterusing the "Butter" command in Matlab and "Buttord" for finding the order of the Filter ... Now I got the Frequency response by using the "Freqz" command. Now I want to test the filter using a test signal in the passband frequecy, how should I generate the test signal and then finally analyze the filter....how the Filter behaves with the Test Signal. Thanks Nitin