[ghost-dev] Quantization of sine params

Anup K C anupkc at gmail.com
Thu Jul 6 21:59:47 PDT 2006

Hi Jean-Marc

I am facing a few problems while trying out the harmonic grouping method.

The decoder is expected to reconstruct the output from  w, ai,bi,ci and di
vectors. So these are the parameters which are to quantized. I was
expeceting that the w vector would contain the frequencies of the signal
accurately or atleast it will  haev teh same characteristics as the  actual
frequencies. But what I observe is that, thought the synthesised signal
contains exactly same sines as teh actual signal the frequencies as
indicated by w do not necessarily show the corerct values. And the biggest
problem is that teh harmonic character of the sine waves is also not
observable in the w vector. And I feel that this might make teh qunatization
very tough; even if we use some other methods. So even if the initial
estimation of the frequencies might not do much harm in the accurate
synthesis of the sinusoids ( since we can adjust the freq offset with phase
modulation), it might be helpful in qunatizing them.

Am I missing out something here ?


On 7/4/06, Anup K C <anupkc at gmail.com> wrote:
> Hi Jean-Marc
> This is what I have been trying.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.xiph.org/pipermail/ghost-dev/attachments/20060707/e2b827f9/attachment.html

More information about the ghost-dev mailing list