Patent ID: 8391505
Filing Date: 2013-03-05
Classification: H04M

Abstract:
1. A reverberation suppressing apparatus separating a plurality of sound source signals based on input signals output from a plurality of microphones collecting the plurality of sound source signals, comprising: a sound signal output unit generating sound signals and outputting the generated sound signals; a sound acquiring unit acquiring the input signals from the microphones; a first evaluation function calculation unit calculating a separation matrix representing correlations among the generated sound signals, the input signals, and the sound source signals, and calculating a first evaluation function for evaluating a degree of separation of the sound source signals from the input signals; a reverberation component suppressing unit calculating, based on the first evaluation function, an optimal separation matrix which is the separation matrix when the degree of separation of the sound source signals is greater than a predetermined value, and suppressing a reverberation component by separating the sound source signals other than the generated sound signals from the input signal based on the calculated optimal separation matrix; and a separation matrix updating unit dividing a step-size function for determining a magnitude of updating of the separation matrix into segments, approximating each of the segments to a linear function, calculating step sizes based on the approximated linear functions, and repeatedly updating the separation matrix by using the calculated step sizes so that the degree of separation of the sound source signals exceeds the predetermined value based on the first evaluation function.