[Mp4-tech] [Audio] Difference in ISO standard and ISO reference!

[har1 flashmail.com]

On 18 Jul 2004 at 23:08, Dattaguru B.N. wrote:
Hi 
some times ISO reference code may not be updated after ammendment .
check out
 ISO_IEC_14496-3_2001_Amd_1_2003_Cor_1_20_PDF_version_(en)_040623_CPDF 
document
Harish
> Dear All,
> 
> While analysing the ISO reference code(15-Mar-2004)
> and ISO standard for SBR(N5570 a.k.a ISO/IEC
> 14496-3:2001/FDAM 1:2003(E)), I found some of the
> difference listed here under.  These are found to be
> crucial from the perspective of the conformance, when
> we were testing the decoder. 
> 
> Can anybody suggest me how to correlate between
> standard and the reference?  Or is it that I am using
> standard which is not upto date??? If so, how do I get
> the most recent version.
> 
> 1. HFAdjustment: while estimating the current Envelope
> (sec.4.6.18.7.3 in N5570), the reference decoder will
> perform the calculation of Ecurr in two different
> loops with a single loop!   I tried to match these two
> loops, but the loop variables were found to be un
> related!!!  The standard clearly given different loop
> variables for two conditions.
> 
> 2. Storing of Previous data:  The standard does not
> specify anything about the storing of previous data. 
> We tried to follow the standard, and were storing it
> at the end of decoding.  But, the reference decoder
> will store some of the data at the same place where
> new data gets calculated.
> 
> These are the few examples. Similar problems also can
> be found in other modules as well.
> 
> Thanks in advance,
> Thanks and regards,
> Datta
> 
> 
> 
> 
> 
> 		
> __________________________________
> Do you Yahoo!?
> Vote for the stars of Yahoo!'s next ad campaign!
> http://advision.webevents.yahoo.com/yahoo/votelifeengine/
> 
> _______________________________________________
> NOTE: Please use clear subject lines for your posts. Include [audio, [video], [systems], [general] or another apppropriate identifier to indicate the type of question you have.
> 
> Note: Conduct on the mailing list is subject to the Antitrust guidelines found at http://www.mpegif.org/public/documents/vault/mp-out-30042-Antitrust.php