Um.  I could go check.
But. Yeah. So when we 're doing all these things using our software there is  um if it 's  if it 's based on the RASTA - PLP program ,  which does both PLP and RASTA - PLP  um then  uh there is an option there which then comes up through to Feacalc which  um allows you to do high - pass filtering and in general we like to do that , because of things like this and  it 's  it 's pretty  it 's not a very severe filter. Doesn't affect speech frequencies , even pretty low speech frequencies , at all , but it 's
What 's the  cut - off frequency it used ?
Oh. I don't know I wrote this a while ago