But it 's  but it 's  uh , it 's  there 's a lot  number of things I like about it , let me just say.
Greedy.
So , first thing , well , you 're absolutely right. I mean ,  i i  in truth ,  both pieces of this are  have their analogies in stuff we already do. But it 's a different take  at how to approach it and potentially one that 's m maybe a bit more systematic than what we 've done , uh , and a b a bit more inspiration from  from auditory things. So it 's  so I think it 's a neat thing to try. The primary features ,  um , are in fact  Yeah , essentially , it 's  it 's , uh , you know , PLP or  or mel cepstrum , or something like that. You 've  you 've got some ,  uh , compression. We always have some compression. We always have some  you know , the  the  the kind of filter bank with a kind of   quasi - log scaling. Um ,  if you put in  if you also include the RASTA in it  i RASTA  the filtering being done in the log domain  has an AGC - like , uh , characteristic , which , you know , people typi typically put in these kind of ,  uh ,  um ,  uh , auditory front - ends. So it 's very , very similar , uh , but it 's not exactly the same. Um , I would agree that the second one is  is somewhat more different but ,  um , it 's mainly different in that the things that we have been doing like that have been   um , had a different kind of motivation and have ended up with different kinds of constraints. So , for instance , if you look at the LDA RASTA stuff ,  you know , basically what they do is they  they look at the different eigenvectors out of the LDA and they form filters out of it. Right ? And those  filters have different , uh , kinds of temporal extents and temporal characteristics. And so in fact they 're multi - scale. But , they 're not sort of systematically multi - scale , like " let 's start here and go to there , and go to there , and go to there " , and so forth. It 's more like ,  you run it on this , you do discriminant analysis , and you find out what 's helpful.
I it 's multi - scale because you use several of these in parallel ,