How can I increase the number of Fourier frequencies by adding 500 zeros to the end of the 27-sample-long signal ??

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Chris
Chris 2021-10-24
回答： Image Analyst 2021-10-24
fs = 250;
t = 0:1/fs:0.107;
L = length(t);
x1 = sin(2*pi*50*t)+0.3;
fftx1=fft(x1)
freqHz = (0:1:length(x1)-1)*fs/L;
plot(freqHz,fftx1,'-o')
I have to increase the number of Fourier frequencies by adding 500 zeros to the end of the 27-sample-long signal.

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回答（2 个）

Matt J
Matt J 2021-10-24
L = length(t)+500;
fftx1=fft(x1, L)
Image Analyst
Image Analyst 2021-10-24

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