Spectrogram definition
In the current implementation, the spectrogram is computed as the norm of the fourier coefficient, i.e., as S=|X|, and then converted to dB using the formula 20*log(S).
According to https://fedora.kug.ac.at/fedora/get/o:69253/bdef:Content/get a more correct definition would be to define the spectrogram as the norm squared, i.e., |X|^2, and then convert to dB using 10*log(S).
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