Design Notching Filter for different frequencies
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Abdulrahman
am 5 Aug. 2014
Bearbeitet: Neema Joseph
am 21 Nov. 2018
Hi,
I want to design a filter with Notches in different frequencies. The MATLAB give the option for one Notch only:
F0 = 60; % interference is at 60 Hz
Fs = 3000; % sampling frequency is 3000 Hz
BW=1;
f = fdesign.notch('N,F0,BW',2,F0,10,Fs);
h = design(f,'SystemObject',true);
hfvt= fvtool(h,'Color','white');
Any idea how to filter the other frequencies?
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Nade Sritanyaratana
am 5 Aug. 2014
In the following code, I create two notch filters, and cascade them together.
F0 = 60; % interference is at 60 Hz
Fs = 3000; % sampling frequency is 3000 Hz
BW=1;
f = fdesign.notch('N,F0,BW',2,F0,10,Fs);
h = design(F);
hfvt= fvtool(h,'Color','white');
f2 = fdesign.notch('N,F0,BW',2,F0+300,10,Fs);
h2 = design(f2);
hfvt= fvtool(h2,'Color','white');
hd = dfilt.cascade(h, h2);
hfvt= fvtool(hd,'Color','white');
2 Kommentare
Nade Sritanyaratana
am 6 Aug. 2014
One quick correction to the code I provided:
After the line:
f = fdesign.notch('N,F0,BW',2,F0,10,Fs);
Correct the following line:
h = design(f);
In other words, F should be f.
Regarding the Bode plot of the composite filter, the last line I provided should have displayed the magnitude response:
hfvt= fvtool(hd,'Color','white');
Did this not work for you? Here's a screenshot of what I'm getting:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/180114/image.png)
The "Analysis" menu provides the option to also look at the phase response, if desired.
Lastly, there are three more methods that simply plot the Bode plots for magnitude, phase, or both - Magnitude response:
>> hd.magresp;
Phase response:
>> hd.phaseresp;
Both:
>> hd.freqresp
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Neema Joseph
am 21 Nov. 2018
Bearbeitet: Neema Joseph
am 21 Nov. 2018
can you please help to write the output of cascaded filter in case of an audio input
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