- Spectral data in the form of an
*N*-point DFT is quantized to frequency bins spaced apart by*f*_{s}/*N*Hz. - Spectral peaks do not generally fall exactly at bin frequencies, thus it is common to interpolate frequency peaks to better estimate their center frequencies and amplitudes.
- A common method for interpolating spectral magnitude peaks is to use quadratic interpolation, which involves fitting a parabola to the three most significant values around a peak.
- Given the three spectral magnitude values around a peak as
, the interpolated peak location (in bins) is given by

(16) - The magnitude at the peak is given as .

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