Right. So it 's taking samples , it 's doing adaptation , it 's adjusting weights , and then it 's getting the sum. So um , uh anyway that 's  that 's kind of a reasonable thing that I 'd like to have somebody try  somebody look  And  and the digits would be a reasonable thing to do that with. I think that 'd be enough data  plenty of data to do that with , and i for that sort of task you wouldn't care whether it was uh large vocabulary speech or anything. Uh.  Um
Is Brian Kingsbury 's work related to that , or is it a different type of reverberation ?
Brian 's  Kingsbury 's work is an example of what we did f f from the opposite dogma. Right ? Which is what I was calling the " party line " , which is that uh doing that sort of thing is not really what we want. We want something more flexible , uh i i where people might change their position , and there might be , you know  There 's also um oh yeah , noise. So the echo cancellation does not really allow for noise. It 's if you have a clean situation but you just have some delays , Then we 'll figure out the right  the right set of weights for your taps for your filter in order to produce the effect of those  those echos. But um if there 's noise , then the very signal that it 's looking at is corrupted so that it 's decision about what the right  you know , right  right uh  delays are  is , uh  is  right delayed signal is  is  is  uh is incorrect. And so , in a noisy situation , um , also in a  in a situation that 's very reverberant   with long reverberation times  and really long delays , it 's  it 's sort of typically impractical. So for those kind of reasons , and also a  a c a complete inversion , if you actually  I mentioned that it 's kind of hard to really do the inversion of the room acoustics. Um , that 's difficult because um often times the  the um   the system transfer function is such that when it 's inverted you get something that 's unstable , and so , if you  you do your estimate of what the system is , and then you try to invert it , you get a filter that actually uh , you know , rings , and  and uh goes to infinity. So it 's  so there 's  there 's  there 's that sort of technical reason , and the fact that things move , and there 's air currents  I mean there 's all sorts of  all sorts of reasons why it 's not really practical. So for all those kinds of reasons , uh we  we  we sort of um , concluded we didn't want to in do inversion , and we 're even pretty skeptical of echo cancellation , which isn't really inversion , and um we decided to do this approach of taking  uh , just picking uh features , which were  uh will give you more  something that was more stable , in the presence of , or absence of , room reverberation , and that 's what Brian was trying to do. So , um , let me just say a couple things that I was  I was gonna bring up. Uh. Let 's see. I guess you  you actually already said this thing about the uh  about the consent forms , which was that we now don't have to  So this was the human subjects folks who said this ,  or that  that  ?
The a apparently  I mean , we 're gonna do a revised form , of course. Um but once a person has signed it once , then that 's valid for a certain number of meetings. She wanted me to actually estimate how many meetings and put that on the consent form. I told her that would be a little bit difficult to say. So I think from a s practical standpoint , maybe we could have them do it once every ten meetings , or something. It won't be that many people who do it  that often , but um just , you know , so long as they don't forget that they 've done it , I guess.