OK.
Yeah. Uh , yeah. So there is this. And maybe we  well we find some people so that  uh , agree to maybe work with us , and they have implementation of VTS techniques so it 's um , Vector Taylor Series that are used to mmm ,  uh f to model the transformation between clean cepstra and noisy cepstra. So. Well , if you take the standard model of channel plus noise , uh , it 's  it 's a nonlinear eh uh , transformation in the cepstral domain.
Mm - hmm. Yes.
And uh , there is a way to approximate this using uh , first - order or second - order Taylor Series and it can be used for  uh , getting rid of the noise and the channel effect.