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Quantization of LSP /G.729

Started by wnit...@yahoo.com August 22, 2006
hi all,
G.729 recommendation states:-to predict the values of LSF a 4th oreder MA is used.Two predictions are possible .the encoder chooses which one to use and indices it with a bit in the bit stream.
after prediction ,prediction error is computed .this error is sent to decoder by vector quantizing it.
my que is what are these two possible predictions ?
what is MA prediction?
can any body please explain VQ in simple terms.how G.729 does this..
any online reference wud be great help

thanx and regards.
Raj
Dear Raj,
I recommend two IEEE papers:
(1)Design and description of CS-ACELP: a toll quality 8 kb_s speech coder
(2)Implementation and performance of an 8-kbit/s conjugate structure CELP speech coder

Best regards
Jianfeng XU

hi all,
> G.729 recommendation states:-to predict the values of LSF a 4th oreder MA is used.Two predictions are possible .the encoder chooses which one to use and indices it with a bit in the bit stream.
>after prediction ,prediction error is computed .this error is sent to decoder by vector quantizing it.
>my que is what are these two possible predictions ?
>what is MA prediction?
>can any body please explain VQ in simple terms.how G.729 does this..
>any online reference wud be great help
>
>thanx and regards.
>Raj
Hi,
Refer "Digital speech" by Kondoz

BVL

w...@yahoo.com wrote:
hi all,
G.729 recommendation states:-to predict the values of LSF a 4th oreder MA is used.Two predictions are possible .the encoder chooses which one to use and indices it with a bit in the bit stream.
after prediction ,prediction error is computed .this error is sent to decoder by vector quantizing it.
my que is what are these two possible predictions ?
what is MA prediction?
can any body please explain VQ in simple terms.how G.729 does this..
any online reference wud be great help

thanx and regards.
Raj