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[hts-users:01583] Re: GV causes clipping


Hi,
It happened to us with mcep.
Decreasing the weight of GV for spectrum alleviates the problem, but it doesn't solve it as it can appear in other files.
Regards

2008/7/30 Nicholas Volk <nvolk@xxxxxxxxxx>
Thanks for the reply. Prettu much what I expected but just wnated to check
I wasn't missing something obvious...
I'm using hts_engine. Changing the factor from 1.0 to, say, 0.5 solves the
problem.

br,
 Nicholas


> Hi,
>
> Nicholas Volk wrote:
>
>> I'm applied global variance to a 22kHz male voice. There's some
>> occasional
>> clipping when using gv. Without GV the results are fine. (Without gv the
>> min and max of the waveform are around +-20000, not far from SLT demo
>> voice.)
>> Have you had this clipping problem with any voices?
>
> This is because the use of GV enhances dynamic ranges of speech
> parameter trajectories.  It sometimes over-enhancement and causes
> overflow.
>
> BTW, which are you using, hts_engine or HMGenS?
>
> Regards,
>
> Heiga ZEN (Byung Ha CHUN)
>
> --
> Heiga ZEN (Byung Ha CHUN)
> Speech Technology Group
> Cambridge Research Lab
> Toshiba Research Europe
> phone: +44 1223 436975
>
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Follow-Ups
[hts-users:01584] Re: GV causes clipping, Jun Xu
References
[hts-users:01578] GV causes clipping, Nicholas Volk
[hts-users:01579] Re: GV causes clipping, Heiga ZEN (Byung Ha CHUN)
[hts-users:01581] Re: GV causes clipping, Nicholas Volk