Oh , OK.
Yeah. It is like a KL transform followed by a Wiener filter. Is the signal is  is a signal substrate.
Oh , oh , OK so the difference is the KL.
So , the  the different  the c the  the advantage of combining two things is mainly coming from the signal subspace approach doesn't work very well if the SNR is very bad. It 's  it works very poorly with the poor SNR conditions , and in colored noise.