Returns a list: $p = the correction coefficient in bins (idx_beta + p
gives the true peak), $ampl_p = the amplitude of the true peak
Arguments
threePoints
the amplitudes of three adjacent points (beta is the
peak), ideally spectrum on a dB scale, obtained with a Gaussian window
plot
if TRUE, plot the points and the fit parabola
Details
Takes a spectral peak and two adjacent points, fits a parabola through them,
and thus estimates true peak location relative to the discrete peak. See
https://ccrma.stanford.edu/~jos/sasp/Quadratic_Interpolation_Spectral_Peaks.html