How to remove a particular frequency in the fft code?
14 views (last 30 days)
Show older comments
Deepika Behmani
on 19 Jun 2019
Commented: Deepika Behmani
on 19 Jun 2019
I am doing FFT of 1000000 data points. I have attached my FFT code. In this code, i got frequency 10.1 kHz but i want to remove that frequency. what kind of filter i can use and is chebyshev type 1 is suitable for this purpose.
data = csvread('5fr_chdis.csv');
time = data(1:1000000,3);
S = data(1:1000000,4);
Fs = 10^(8); % sampling frequency
T = 1/Fs; % sampling timeperiod
L = 1000000; % length of signal
t = (0:L-1)*T;
f = Fs*(0:(L/2))/L;
f1 = f/1000;
Y = fft(S);
P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);
plot(f1,P1)
title('Frequency spectrum')
xlabel('frequency (kHz)')
ylabel('Amplitude')
%axis([0 50 ylim])
axis([100 200 0 0.2])
0 Comments
Accepted Answer
Walter Roberson
on 19 Jun 2019
[~, idx] = min(abs(f - 10.1)); %which bin is closest to 10.1 ?
Y(idx) = 0; %zero that bin
Y(end-idx+2) = 0; %zero its complex conjugate
More Answers (0)
See Also
Categories
Find more on Fourier Analysis and Filtering in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!