I had another thought just now , which is , uh , remember we were talking before about  we were talking in our meeting about , uh , this stuff that  some of the other stuff that Avendano did , where they were , um , getting rid of low - energy  sections ? Um , uh , if you  if you did a high - pass filtering , as Hirsch did in  late eighties to reduce some of the effects of reverberation , uh , uh , Avendano and Hermansky were arguing that , uh , perhaps one of the reasons for that working was ma may not have even been the filtering so much but the fact that when you filter a  an all - positive power spectrum you get some negative values , and you gotta figure out what to do with them if you 're gonna continue treating this as a power spectrum. So , what  what Hirsch did was , uh , set them to zero  set the negative values to zero. So if you imagine a  a waveform that 's all positive , which is the time trajectory of energy , um , and , uh , shifting it downwards , and then getting rid of the negative parts , that 's essentially throwing away the low - energy things. And it 's the low - energy parts of the speech where the reverberation is most audible. You know , you have the reverberation from higher - energy things showing up in  So in this case you have some artificially imposed  reverberation - like thing. I mean , you 're getting rid of some of the other effects of reverberation , but because you have these non - causal windows , you 're getting these funny things coming in , uh , at n And , um , what if you did  ? I mean , there 's nothing to say that the  the processing for this re - synthesis has to be restricted to trying to get it back to the original , according to some equation. I mean , you also could , uh , just try to make it nicer.
Uh - huh.
And one of the things you could do is , you could do some sort of VAD - like thing
Mm - hmm.