and we extend these coefficient between the  all the frequency range.
Mm - hmm.
And i the interpolation i between the point  is  give for the triang triangular filter , the value of the triangular filter and of this way we obtained this mode this model speech.
So you essentially take the values that  th that you get from the triangular filter and extend them to sor sort of like a rectangle , that 's at that m value.