Blind source separation and sound source localization on time‐frequency domain considering time lag information
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The blind source separation and sound source localization based on independent component analysis on time‐frequency domain considering time lag information between source signals and observation signals are conducted. The formulation based on the independency of time‐frequency domain and the linearity of source signal is presented. The method which can be conducted not only the separation of source signals but also the specification of location of source signals is proposed through the consideration of time lags. Using this method, it can be analyzed even if observation signals include an intermittent noise, under the assumption of some independency of source signals. First of all, the number of source signals is specified through the quotient of complex valued time‐frequency information of two observation signals. Next, the locations of source signals are specified using the relationship of relative time lags between source signal and observation signal. Then, the source signals are obtained by use of th...