Patent ID: 9031837
Filing Date: 2015-05-12
Classification: G10L

Abstract:
1. A speech quality evaluation system that outputs a predicted value of a subjective opinion score for evaluation speech, the system comprising: a speech distortion calculation unit that conducts a process of subtracting, after frequency-power characteristics of the evaluation speech are calculated, subtraction characteristics, which are the frequency-power characteristics calculated from background noise, from the frequency-power characteristics of the evaluation speech, and calculates a speech distortion based on the frequency-power characteristics after the subtracting process; a subjective evaluation prediction unit that calculates the predicted value of the subjective opinion score based on the speech distortion; and a weighting unit that generates a plurality of weighted subtraction characteristics corresponding to plural scales for subjective evaluation by multiplying the subtraction frequency-power characteristics by a plurality of weight coefficients that are different from each other, wherein the speech distortion calculation unit generates a plurality of subtracted frequency-power characteristics by subtracting each of the plurality of weighted subtraction characteristics from the frequency-power characteristics of the evaluation speech, and calculates a plurality of speech distortions by comparing each of the plurality of subtracted frequency-power characteristics with frequency-power characteristics of a reference speech, and the subjective evaluation prediction unit calculates predicted values of one or a plurality of subjective opinion scores based on the plurality of speech distortions calculated in the speech distortion calculation unit.