And they filter the original signal using that fil filter ,
Uh - huh.
which is like final filter is acting on the input noisy speech rather than on the cleaned up. So this is more like I 'm doing Wiener filter twice , but the only thing is that the second time I 'm actually smoothing the filter and then cleaning up the cleaned up spectrum first level. And so that  that 's  that 's what the difference is.
OK.