You can choose this command after selecting 1 or more LPC objects.
Settings

Minimum frequency resolution (Hz)

successive frequencies in the Spectrum will be maximally this distance apart

Bandwidth reduction (Hz)

formants with small bandwidths show up very well as darker regions in the spectrogram because the poles lie close to the contour along which a spectrum is computed (the unit circle in the zplane). Peak enhancement can be realized by computing a spectrum in the zplane along a contour of radius r = exp (– π · bandwidthReduction / samplingFrequency).

Deemphasis frequency (Hz)

Performs deemphasis when value is in the interval (0, Nyquist frequency)
Algorithm
For each LPC_Frame the corresponding Spectrum will be calculated according to the algorithm explained in LPC: To Spectrum (slice).... For each frequency the power, i.e., the square of the complex values, will be stored in the corresponding area in the Spectrogram.
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© djmw, April 7, 2004