Wiener filter. Yeah , in general , you don't  that 's right you don't wanna othorg orthogonalize if the things are noisy. Actually. Um , that was something that uh , Herve and I were talking about with um , the multi - band stuff , that if you 're converting things to from uh , bands , groups of bands into cepstral coef you know , local sort of local cepstral coefficients that it 's not that great to do it if it 's noisy.
Mm - hmm. OK. Yeah. So.
Uh , so.
So that  that 's one reason maybe we could combine s some  something to improve SNR a little bit , first stage ,