[hts-users:00649] Re: F0 contours become flat

[tomoki@xxxxxxxxxxx]

Hi, 

> Perhaps measuring the RMSE in the F0 could show if the predicted contour 
> with GV minimizes the error in comparison with the conventional method. 

Note that the generation algorithm considering GV usually causes LARGER 
errors compared with the conventional one. This tendency is observed in 
both mel-cep and F0 generations. 

The HMM likelihood for a parameter trajectory generated by the conventional 
algorithm is too large compared with that for a natural one. This implies that we 
don't have to maximize only the HMM likelihood. This point is described in th 
following papers: 

   T. Toda, A.W. Black, and K. Tokuda, ICASSP2005. 
   T. Toda and K. Tokuda, IEICE, May 2007 (to appear). 

Note that the ICASSP paper describes only the mel-cep generation in voice 
conversion but we can see the similar result on the mel-cep and F0 generations 
in HTS as well. Those HTS-results are described in the IEICE paper. 

Thanks, 
Tomoki Toda 
  Nara Institute of Science and Technology 
  E-mail: tomoki@xxxxxxxxxxx 
  TEL: +81-743-72-5282 
  FAX: +81-743-72-5289 
----- Original Message ----- 
From: "Xavi Gonzalvo" <gonzalvo@xxxxxxxxxxxxx>
To: <hts-users@xxxxxxxxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, April 17, 2007 6:27 PM
Subject: [hts-users:00645] Re: F0 contours become flat


> Hi,
> 
> I've been reading the GV information as explained in your article
> Interspeech 2005 and I notice that the MOS improves when GV is used in
> mel-cepstral, but perceptual tests don't show an improvement when applied to
> F0 (as explained in the paper, perhaps caused by some data errors).
> 
> Perhaps measuring the RMSE in the F0 could show if the predicted contour
> with GV minimizes the error in comparison with the conventional method.
> 
> Greetings
> 
> -----Mensaje original-----
> De: Heiga ZEN (Byung Ha CHUN) [mailto:zen@xxxxxxxxxxxxxxxx] 
> Enviado el: martes, 13 de marzo de 2007 23:49
> Para: hts-users@xxxxxxxxxxxxxxxxxxxxxxxxx
> Asunto: [hts-users:00577] Re: F0 contours become flat
> 
> Hi,
> 
> Xavi Gonzalvo wrote:
> 
>> Let me add to this that we carried out some tests with Spanish Language
>> comparing the f0 contour from HTS 1.1.1 and the one obtained from a CBR
>> (Case Base Reasoning) algorithm. HMM contour were absolutely flatter than
>> the CBR one, especially when phrases were interrogative and short.
> 
> In our internal version we use GV.
> It can reduce this problem.
> 
> Regards,
> 
> Heiga ZEN (Byung Ha CHUN)
> 
> -- 
> ------------------------------------------------
> Heiga ZEN     (in Japanese pronunciation)
> Byung Ha CHUN (in Korean pronunciation)
> 
> Department of Computer Science and Engineering
> Nagoya Institute of Technology
> Gokiso-cho, Showa-ku, Nagoya 466-8555 Japan
> 
> http://www.sp.nitech.ac.jp/~zen
> ------------------------------------------------