Patent ID: 8213633
Filing Date: 2012-07-03
Classification: H04R

Abstract:
1. A sound source separation system that separates a target sound and a disturbance sound coming from an arbitrary direction other than a direction from which the target sound comes, comprising: a plurality of different-directional-signal-group generators each generating more than or equal to two combinations of spectrums of a plurality of signals each of which has a different directivity, using received sound signals of a plurality of microphones; and a sensitive region formation unit which determines whether or not a relationship between powers of the spectrums in a combination simultaneously satisfies a plurality of conditions each defined for a combination, for each frequency band, using more than or equal to two combinations of the spectrums of the plurality of signals generated by the respective different-directional-signal-group generators, and performs multidimensional band selection of assigning power of a spectrum selected beforehand to a spectrum of the target sound to be separated, for a frequency band where the plurality of conditions are simultaneously satisfied, wherein each different-directional-signal-group generator generates a spectrum of a target sound superior signal and a spectrum of a target sound inferior signal using the received sound signals of the plurality of microphones, the sensitive region formation unit sets a condition for each combination as a condition that power of the spectrum of the target sound superior signal is larger than power of the spectrum of the target sound inferior signal, and determines whether or not those conditions are simultaneously satisfied for each frequency band, the sound source separation system has a total of three first, second and third microphones disposed at respective vertices of a triangle, the sensitive region formation unit performs two-dimensional-band selection of assigning power of a spectrum of a target sound superior signal generated by either one of the first and second different-directional-signal-group generators to a spectrum of the target sound to be separated.