i sampled a 50Hz signal at 800Hz and i want to use FFt to extract the magnitude of the fundamental frequency (50Hz). how do i go about it? Please can anyone be of help. Thank you
3 ビュー (過去 30 日間)
古いコメントを表示
i sampled a 50Hz signal at 800Hz and i want to use FFt to extract the magnitude of the fundamental frequency (50Hz). how do i go about it? Please can anyone be of help. Thank you
0 件のコメント
回答 (1 件)
Star Strider
2017 年 6 月 26 日
See the documentation on fft (link). Specifically note the code between the first (top) two plot figures.
2 件のコメント
Star Strider
2017 年 6 月 26 日
Contact Support (link)
This is essentially the code I referred to:
D = Your_Signal;
Fs = 800; % Sampling Frequency (Hz)
Fn = Fs/2; % Nyquist Frequency (Hz)
L = length(D);
FTD = fft(D)/L;
Fv = linspace(0, 1, fix(L/2)+1)*Fn; % Frequency Vector (Hz)
Iv = 1:length(Fv); % Index Vector
figure(1)
plot(Fv, abs(FTD(Iv))*2)
grid
参考
カテゴリ
Help Center および File Exchange で Fourier Analysis and Filtering についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!