Method and device for separating a mixture of source signals
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorTony Gustafsson
Life of this patent
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Abstract
Device and method for separating a mixture of source signals to regain the source signals, the device and method being based on measured signals, the invention comprises: bringing each measured signal to a separation structure including an adaptive filter, the adaptive filter comprising filter coefficients; using a generalized criterion function for obtaining the filter coefficients, the generalized criterion function comprising cross correlation functions and a weighting matrix, the cross correlation functions being dependent on the filter coefficients; estimating the filter coefficients, the resulting estimates of the filter coefficients corresponding to a minimum value of the generalized criterion function; and updating the adaptive filter with the filter coefficients.
Claims11
A method for separating a mixture of source signals to regain the source signals, the method being based on measured signals, the method comprising:
- bringing each measured signal to a separation structure including an adaptive filter, the adaptive filter comprising filter coefficients;
- using a generalized criterion function for obtaining the filter coefficients, the generalized criterion function comprising cross correlation functions and a weighting matrix, the cross correlation functions being dependent on the filter coefficients;
- said weighting matrix, being an inverse matrix of a matrix comprising an estimation of a covariant matrix for a signal;
- said signal having a spectrum being a product of estimated spectrum of an incoming source-signal and the determinant of an estimated transformation function of a mixing filter;
- estimating the filter coefficients, the resulting estimates of the filter coefficients corresponding to a minimum value of the generalized criterion function;
- and
- updating the adaptive filter with the filter coefficients.
A device for separating a mixture of source signals to regain the source signals, the input to the device being based on measured signals, the device comprising:
- signaling links for bringing each measured signal to a separation structure including an adaptive filter, the adaptive filter comprising filter coefficients;
- a generalized criterion function means for obtaining the filter coefficients, the generalized criterion function means comprising cross correlation functions and a weighting matrix, the cross correlation functions being dependent on the filter coefficients;
- said weighting matrix, being an inverse matrix of a matrix comprising an estimation of a covariant matrix for a signal;
- said signal having a spectrum being a product of estimated spectrum of an incoming source-signal and the determinant of an estimated transformation function of a mixing filter;
- means for estimating the filter coefficients, the resulting estimates of the filter coefficients corresponding to a minimum value output of the generalized criterion function;
- and
- updating means for updating the adaptive filter with the filter coefficients.
Dependencies are inferred from the claim text.