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tripathy12345 / FBSE-EWT

Fourier Bessel Series Expansion- Empirical Wavelet Transform
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why does the FBSE spectrum of ECG is giving a strange response than FFT??? #1

Open rsarka34 opened 4 days ago

rsarka34 commented 4 days ago

image why does the FBSE spectrum of ECG is giving a strange response than FFT.

how does the amplitude is negative.. do we have to take absolute value

tripathy12345 commented 4 days ago

What do you mean by a strange response?

FFT uses complex exponentials, whereas FBSE uses Bessel functions (real valued only).

Even for other signals, you will get -ve amplitude value for different order of the Bessel function. https://en.wikipedia.org/wiki/Fourier%E2%80%93Bessel_series Yes, one can take absolute value. FBSE-EWT uses absolute value of FBSE coefficients to design filter bank.