How do you say ? I will read because it 's better for my English. I i given is the estimate of the PDF of the noise signal when we have a , um , a statistic of the clean speech and an statistic of the noisy speech. And the clean speech  the statistic of the clean speech is  from a  codebook. Mmm ? This is the idea. Well , like , this relation is not linear. The methods propose to develop this in a vectorial Taylor series  approximation.
I I 'm actually just confused about  the equations you have up there. So , uh , the top equation is  is  is
No , this in the  it 's  this is the log domain. I  I must to say that.
Which is  which is the log domain ?