Um  Also , we speak  the whole  where all this stuff comes from is from an assumption that signal and noise are uncorrelated. And that certainly makes sense in s in  in a statistical interpretation , that , you know , over , um , all possible realizations that they 're uncorrelated
Mm - hmm.
or assuming , uh , ergodicity that i that i um , across time , uh , it 's uncorrelated. But if you just look at  a quarter second , uh , and you cross - multiply the two things , uh , you could very well , uh , end up with something that sums to something that 's not zero. So in fact , the two signals could have some relation to one another. And so there 's all sorts of deviations from ideal in this. And  and given all that , you could definitely end up with something that 's negative. But if down the road you 're making use of something as if it is a power spectrum , um , then it can be bad to have something negative. Now , the other thing I wonder about actually is , what if you left it negative ? What happens ?
Is that the log ?