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Finding a good query to find an answer in www search engines isn't as easy as I thought. The subject is very narrow and sophisticated.

When one performs a FFT, he/she/IT ;) gets the amplitude and phase spectra. The phase spectrum ranges from -PI to PI. Then, there are of course places where the phase spectrum is discontinuous because it exceeds the range. How to obtain such continuous phase spectrum? Does any one know the idea for this?

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# FFT (Fast Fourier Transform) - a method for phase continuation

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