[hts-users:02867] Re: Question about duration model structure

["Heiga ZEN (Byung Ha CHUN)" <heiga.zen@xxxxxxxxxxxxxxxxx>]

Hi,

ZhuFengyun wrote (2011/05/25 6:40):

> Dear HTS developers:
> As Dr. ZEN said in http://hts.sp.nitech.ac.jp/hts-users/spool/2007/msg00680.html
> <http://hts.sp.nitech.ac.jp/hts-users/spool/2007/msg00680.html>
> "In the previous versions we used a multi-variate Gaussian PDF to represent
> state duration PDFs.
> However, since version 2.0.1 we have changed it to multi-stream structure."
> I'm confused about why are you making the decision that using multi-stream
> structure instead of multi-variate Gaussian PDF?
> Can someone make a brief explanation about the advantages of using a
> multi-stream structure?

Because implementation of HSMM training and adaptation was easier.  With the 
multi-stream structure, existing functions (SOutP(), ApplyCompFXForm(), 
ApplyXForm(), etc.) could be reused to implement HSMM training & adaptation.

If we kept using the old multi-variate Gaussian PDF, I needed to implement 
various additional functions from the scratch for this functionality.  The gap 
between HTK and HTS might increase and maintenance of HTS might be harder.

Regards,

Heiga ZEN (Byung Ha CHUN)

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