um , it was like RASTA in the sense that of it was , um , de - convolution by filtering um , except he used a longer time window ,
Mm - hmm.
like a second maybe. And the reason for that is RASTA 's time window is too short to , um include the whole , um , reverberation  um , I don't know what you call it the reverberation response. I if you see wh if you see what I mean. The reverberation filter from my mouth to that mike is like  it 's t got it 's too long in the  in the time domain for the um  for the RASTA filtering to take care of it. And , um , then there are a couple of other speech enhancement approaches which haven't been tried for speech recognition yet but have just been tried for enhancement , which , um , have the assumption that um , you can do LPC um analysis of th of the signal you get at the far microphone and the , um , all pole filter that you get out of that should be good. It 's just the , um , excitation signal  that is going to be distorted by the reverberation and so you can try and reconstruct a better excitation signal and , um , feed that through the i um , all pole filter and get enhanced speech with reverberation reduced.
Mm - hmm. Mm - hmm.