Yeah.
So  so basically now you have this mixture of two Gaussians , you  you n know what they are , and , uh  I mean , sorry , you estimate what they are , and , uh , so this gives you what the signal is and what the noise e energy is in that band in the spectrum. And then you look over the whole thing and now you have a noise spectrum. So , uh , Hans - Guenter Hirsch and others have used that kind of method. And the other thing to do is  which is sort of more trivial and obvious   is to , uh , uh , determine through magical means that  that , uh , there 's no speech in some period , and then see what the spectrum is.
Mm - hmm.
Uh , but , you know , it 's  that  that  that 's tricky to do. It has mistakes. Uh , and if you 've got enough time , uh , this other method appears to be somewhat more reliable. Uh , a variant on that for just determining signal - to - noise ratio is to just , uh  you can do a w a uh  an iterative thing , EM - like thing , to determine means only. I guess it is EM still , but just  just determine the means only. Don't worry about the variances.