| 摘要 |
A signal arrival direction deducing device capable of deducing the signal arrival direction even when a correlation matrix between input signals and noise correlation matrix are singular. In the device, observing means ( 1 ) observes a state in which only noise is present and a state in which a sound whose arrival direction is to be deduced is inputted, short time Fourier transform means ( 2 ) performs short time Fourier transform, and correlation matrix computing means ( 3 ) computes a noise correlation matrix and an input signal correlation matrix. The correlation matrices obtained are held in noise correlation matrix holding means ( 4 ) and input signal correlation matrix holding means ( 5 ) respectively. Using these correlation matrices, proper eigenvalues/proper eigenvectors/improper eigenvectors computing means ( 6 ) computes the proper eigenvalues, the proper eigenvectors and the improper eigenvectors of the noise correlation matrix with respect to the input signal correlation matrix. Complementary space component matrix computing means ( 7 ) computes a matrix for determining the complementary space component of the signal partial space from the obtained proper eigenvalues, the proper eigenvectors, and the improper eigenvectors. Arrival direction searching means ( 8 ) searches for the sound arrival direction using the matrix for determining the complementary space component of the signal partial space.
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