Patent ID: 7474756

Claim:
A method for non-square blind source separation (BSS) under coherent noise, comprising: estimating mixing parameters of a mixed source signal; first filtering the estimated mixing parameters so that output noise is reduced; and second filtering the estimated mixing parameters so that the mixed source signal is separated from the output noise, wherein the step of estimating the mixing parameters comprises: computing a partition and selection map by using the following equation Σ ^ ⁡ ( k , ω ) = argmax l ⁢  Z Σ ⁡ ( k , ω ) * ⁢ Γ n - 1 ⁢ X ⁡ ( k , ω )  2 Z Σ ⁡ ( k , ω ) * ⁢ Γ n - 1 ⁢ Z Σ ⁡ ( k , ω ) , with α l =α l s and τ l =τ l s ; and computing mixing parameters by applying a gradient descent to the following equation ( α l ^ , τ l ^ ) = argmax α l , τ l ⁢ ∑ ( k , ω ) ∈ ⁢ Ω l ⁢  Z Σ ⁡ ( k , ω ) * ⁢ Γ n - 1 ⁢ X ⁡ ( k , ω )  2 Z Σ ⁡ ( k , ω ) * ⁢ Γ n - 1 ⁢ Z Σ ⁡ ( k , ω ) until it converges to a local optimum α l s+l , τ l s+l for each 1≦l≦L and subset of time-frequency points Ω l s+l .