What they would do is that they would weight each coefficient by inverse of the variance. Turns out that uh the variance decreases at least at fast , I believe , as the index of the cepstral coefficients. I think you can show that uh uh analytically.
Mm - hmm.
So typically what happens is that you  you need to weight the  uh weight the higher coefficients more than uh the lower coefficients.
Hmm. Mm - hmm. Hmm.