Patent ID: 8271277
Filing Date: 2012-09-18
Classification: G10L,H04N,H04R,H04S

Abstract:
1. A dereverberation apparatus for eliminating late reverberation from an acoustic signal having the late reverberation, the dereverberation apparatus comprising: a memory that stores, for each of M channels, multiple discrete acoustic signals, the discrete acoustic signals of each channel m obtained by sampling, at multiple points in time, of the acoustic signal as observed by a respective one of M sensors, where m=1 to M, M≧1; a model application unit that calculates, by using the discrete acoustic signals, linear prediction coefficients α where x w (n) is a discrete acoustic signal of a channel w at the discrete time n, w=1 to M, x m (n) is the discrete acoustic signal of the channel m at the discrete time n, m=1 to M, e w (n) is a prediction error of the channel w at the discrete time n, N is a positive integer, ● is a Floor function, α w,m (p) is a p-th linear prediction coefficient in a case the linear prediction target is x w (n), and D is a constant representing a step size; and a late reverberation predictor that outputs a linear prediction value as predicted late reverberation, r of the multi-step linear prediction model.