For rank-constrained spatial covariance estimation, the paper replaces per-iteration matrix inversions with precomputed scalars, reducing update complexity from O(IJM^3) to O(IJ) per iteration.
Stable and fast update rules for independent vector analysis based on auxiliary function technique,
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Acceleration of rank-constrained spatial covariance matrix estimation for blind speech extraction
For rank-constrained spatial covariance estimation, the paper replaces per-iteration matrix inversions with precomputed scalars, reducing update complexity from O(IJM^3) to O(IJ) per iteration.