Right. But I mean the other thing is that that 's  I mean , the other way of looking at this , going back to , uh , mean cepstral subtraction versus RASTA kind of things , is that you could look at mean cepstral subtraction , especially the way you 're doing it , uh , as being a kind of filter. And so , the other thing is just to design a filter. You know , basically you 're  you 're  you 're doing a high - pass filter or a band - pass filter of some sort and  and just design a filter. And then , you know , a filter will have a certain behavior and you loo can look at the start up behavior when you start up with nothing.
Mm - hmm.
And  and , you know , it will , uh , if you have an IIR filter for instance , it will , um , uh , not behave in the steady - state way that you would like it to behave until you get a long enough period , but , um , uh , by just constraining yourself to have your filter be only a subtraction of the mean , you 're kind of , you know , tying your hands behind your back because there 's  filters have all sorts of be temporal and spectral behaviors.
Mm - hmm.