Spectral Rolloff

Spectral rolloff point is defined as the Nth percentile of the power spectral distribution, where N is usually 85% or 95%. The rolloff point is the frequency below which the N% of the magnitude distribution is concentrated.

This measure is useful in distinguishing voiced speech from unvoiced: unvoiced speech has a high proportion of energy contained in the high-frequency range of the spectrum, where most of the energy for voiced speech and music is contained in lower bands.

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