Hi,
Bandwidth expansion is done inorder to bring the poles of the LPC filter onto
the unit circle of the Z plane.
This is done for increasing the stability of predictor co-effecients.
But I don't know why it is different for G.723 and G.729
With Rgds
Chetan k.
Reply by Cool Dsp●June 11, 20032003-06-11
Hello,
I am new to Speech Coding. I was reading through the ITU-T specs for G.723
and
G.729. Can anyone enlighten me on the following aspects:
The importance of bandwidth expansion after LPC estimation?
Why this expansion is different for G.723(7.5 Hz) and G.729(40 Hz)?