Patent ID: 8812313
Filing Date: 2014-08-19
Classification: G10L

Abstract:
1. A voice activity detector comprising: judgment result deriving unit which makes a judgment between active voice and non-active voice every unit time for a time series of voice data in which the number of active voice segments and the number of non-active voice segments are already known as a number of the labeled active voice segment and a number of the labeled non-active voice segment, the judgment result deriving unit shaping active voice segments and non-active voice segments as the result of the judgment by comparing, with a duration threshold, the length of each segment during which the voice data is consecutively judged to correspond to active voice by the judgment or the length of each segment during which the voice data is consecutively judged to correspond to non-active voice by the judgment; segment number calculating unit which calculates the number of active voice segments and the number of non-active voice segments from the judgment result after the shaping; and duration threshold updating unit which updates the duration threshold so that the difference between the number of active voice segments calculated by the segment number calculating unit and the number of the labeled active voice segments decreases or the difference between the number of non-active voice segments calculated by the segment number calculating unit and the number of the labeled non-active voice segments decreases.