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Bandwidth expansion in G.723 and G.729

Started by Cool Dsp ●June 11, 2003

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)?

Thanks.

Warm Regards,

Kris




Reply by chetan k ●June 12, 20032003-06-12
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.

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