Frequency plot not working properly when using IFFT

1 次查看(过去 30 天)
I have impoted an ultrasound signal to matlab and I was to look at this signal in the frequency spectrum, but I am not sure if I am missing some information, but my plot doesn't work. What I have tried is as follows. My imported file contains 8600 x 1 arrays for my Data and Time vectors. Any input would be appreciated :)
FName = 'Tit_10MHz_110F.flxhst';
MyData = read_history(FName);
Time = MyData.TimeRecB.Time;
Data= MyData.DataRecB(1).Data;
fft_points = 2 ^ nextpow2(size(Time, 1));
time_step=(Time(2)-Time(1));
frequency_spectrum = fft(Time, fft_points);
frequency_spectrum = frequency_spectrum(1:end / 2, :);
frequency_step = 1 / (fft_points * time_step);
frequency = ([1 : fft_points / 2] - 1) * frequency_step;
figure(5)
plot(frequency, abs(frequency_spectrum));

采纳的回答

VBBV
VBBV 2022-3-21
编辑:VBBV 2022-3-21
time_step=(Time(2)-Time(1));
Check with timestep. It may not be constant difference between first two values in Time vector
  1 个评论
David Harra
David Harra 2022-3-21
Hey VBBV, I think this seems to be the case. It is not exactly constant. I am not to sure how to fix this issues. Any suggestions?

请先登录,再进行评论。

更多回答(0 个)

标签

产品


版本

R2021b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by