You can choose this command after selecting 1 or more LPC objects.
Settings
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Minimum frequency resolution (Hz)
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successive frequencies in the Spectrum will be maximally this distance apart
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Bandwidth reduction (Hz)
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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 z-plane). Peak enhancement can be realized by computing a spectrum in the z-plane along a contour of radius r = exp (– π · bandwidthReduction / samplingFrequency).
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De-emphasis frequency (Hz)
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Performs de-emphasis 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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