Right ? And you can use EM to figure out what it is. You know.
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.