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Computing 1024 FFT from noisy ecg

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Eddie Burns
Eddie Burns 2019-12-10
回答： Roshni Garnayak 2019-12-13
I am wondering how to compute a 1024 point FFT from an initial 1024 samples segment of a noisy ECG without DC component. Then, from the obtained FFT, plot the absolute value (magnitude) of the frequency spectrum of the noisy ECG (without DC component) expressing the x-axis (horizontal) in units of frequency (Hz)
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dpb
dpb 2019-12-10
See doc fft for example.
If the signal is noisy, unless you have recorded quite a bit so you can average, the results are likely to be near meaningless for single samples.

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回答（1 个）

Roshni Garnayak
Roshni Garnayak 2019-12-13
You can refer to the following link to get examples on how to remove noise from ECG signals.
https://www.mathworks.com/help/dsp/ug/removing-high-frequency-noise-from-an-ecg-signal.html
After removing noise, you can compute the 1024 FFT of the signal using the ‘fft’ function. Refer to the link below for more information on ‘fft’:
https://www.mathworks.com/help/matlab/ref/fft.html

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