Abstract: A signal separating device includes an iterative estimator, a repeating calculator, a result output unit, and a repetition controller. The repeating calculator repeatedly causes the iterative estimator to iteratively perform independent component analysis on an observed signal matrix, and to further perform independent component analysis on the source signal matrix obtained as a result. The result output unit outputs the product of the respective mixing matrices obtained during each repetition as a mixing matrix with respect to the observed signal matrix, while also outputting the source signal matrix obtained during the final repetition as a source signal matrix with respect to the observed signal matrix. The repetition controller causes the repeating calculator to repeat the calculation control until all mixing matrices and all source signal matrices satisfy a convergence condition. The iterative estimator may perform a fixed number of iterations, or perform iterations until convergence is obtained.

Abstract: A signal separating device includes an iterative estimator, a repeating calculator, a result output unit, and a repetition controller. The repeating calculator repeatedly causes the iterative estimator to iteratively perform independent component analysis on an observed signal matrix, and to further perform independent component analysis on the source signal matrix obtained as a result. The result output unit outputs the product of the respective mixing matrices obtained during each repetition as a mixing matrix with respect to the observed signal matrix, while also outputting the source signal matrix obtained during the final repetition as a source signal matrix with respect to the observed signal matrix. The repetition controller causes the repeating calculator to repeat the calculation control until all mixing matrices and all source signal matrices satisfy a convergence condition. The iterative estimator may perform a fixed number of iterations, or perform iterations until convergence is obtained.

Abstract: A biosignal measuring apparatus for measuring, with a plurality of sensors, minute biosignals generated from bioelectric current sources in a region of a patient to be diagnosed. The apparatus includes a signal decomposer for decomposing detection signals provided by the plurality of sensors into a plurality of independent components, a noise component remover for determining noise components among the independent components based only on states of the independent components, and removing the noise components, a signal restorer for deriving restored detection signals from respective non-noise independent components, and a signal analyzer for determining an intracerebral activity corresponding to each independent component of each of the restored detection signals. After removing independent components determined to be noise components by the independent component analysis technique, a detection signal is separately restored for each information source from the remaining non-noise independent components.