Patent ID: 7797153
Filing Date: 2010-09-14
Classification: G10L

Abstract:
1. A speech signal separation apparatus for separating an observation signal in a time domain of a plurality of channels wherein a plurality of signals including a speech signal are mixed using independent component analysis to produce a plurality of separation signals of the different channels, comprising: a first conversion section configured to convert the observation signal in the time domain into an observation signal in a time-frequency domain; a non-correlating section configured to non-correlate the observation signal in the time-frequency domain between the channels; a separation section configured to produce separation signals in the time-frequency domain from the observation signal in the time-frequency domain; and a second conversion section configured to convert the separation signals in the time-frequency domain into separation signals in the time domain; said separation section being operable to produce the separation signals in the time-frequency domain from the observation signal in the time-frequency domain and a separation matrix in which initial values are substituted, calculate modification values for the separation matrix using the separation signals in the time-frequency domain, a score function which uses a multi-dimensional probability density function, and the separation matrix, modify the separation matrix until the separation matrix substantially converges using the modification values and produce separation signals in the time-frequency domain using the substantially converged separation matrix; each of the separation matrix which includes the initial values and the separation matrix after the modification which includes the modification values being a normal orthogonal matrix.