Bandwidth expansion in G.723 and G.729
Started by ●June 11, 2003
I am new to Speech Coding. I was reading through the ITU-T specs for G.723
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)?
Reply by ●June 12, 20032003-06-12
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