# [hts-users:02240] Re: Question about the generation algorithm

```В Сбт, 10/10/2009 в 19:30 +0900, YounSung Park пишет:
> Dear HTS maintainer,
>
> I am a student researching about the HTS based singing voice
> synthesis.
>
> I think there is something I can't understand.
>
> I saw the paper about the parameter generation algorith.
>
> In the paper, the parameter generation algorithm has constraint in the
> generated parameter O = WC.
>
> But actually, if the cepstrum vector generated from one state is long,
> I can't find the relationship between the cepstrum sequence.
>
> ( I saw the plot of the 0-th and 2nd cepstrum vector and I find that
> there's no discontinuity between the state transition. However after
> the transition and 10 frame later, the generated cepstrum value is
> flat..!! )
>
> So I think that the parameter generation algorithm has some problem if
> the duration length of one state is long.
>
> Thank you for reading this mail.
>
> problem.

Dear YounSung, just to be precise you are probably referring to this
article:

http://hts.sp.nitech.ac.jp/?plugin=attach&refer=Publications&openfile=tokuda_icassp2000.pdf

As for your question, there is no problem with spectrum being flat
during the state, it's supposed to be so. This can be viewed as
piecewise approximation for example.

Feel free to ask other questions, but try to state them so we could
understand.

```

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References
[hts-users:02236] Question about the generation algorithm, YounSung Park