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Discussion Groups | Speech Coding | Re: Quantization of LSP /G.729

Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)

  

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Quantization of LSP /G.729 - wnit...@yahoo.com - Aug 22 8:21:21 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


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Re: Quantization of LSP /G.729 - xuji...@gmail.com - Aug 24 9:16:30 2006

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


(You need to be a member of speechcoding -- send a blank email to speechcoding-subscribe@yahoogroups.com )

Re: Quantization of LSP /G.729 - BVL - Aug 24 9:20:15 2006

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


(You need to be a member of speechcoding -- send a blank email to speechcoding-subscribe@yahoogroups.com )