[Speex-dev] Quality degradation on new versions

[Aviv Tamar]

Hi Jim,
First of all - thanks, turning the highpass filter off was what I needed,
and the waveforms
match now.
But, when i did the PESQ tests again I found an interesting result :
version 1.0.5 still got
a slightly better average score, but the standard deviation on version 1.2
beta1 was much smaller.
The cause for that is this - on some samples versions 1.0.5 and 1.2beta2
produced a single
noticable 'click' during the speech, while version 1.2beta1 didn't.
Do you have an idea what can cause the click, and how to turn it off?

Aviv


speex-dev-bounces at xiph.org wrote on 12/07/2007 21:26:51:

> Hi Aviv,
>
> Does the audio sound bad?
>
> You can try turning off the highpass filter (which was not in 1.0.5).
This
> code is from ti/testenc-TI-C5x.c in the source tree:
>
>    /* Turn this off if you want to measure SNR (on by default) */
>    tmp=0;
>    speex_encoder_ctl(st, SPEEX_SET_HIGHPASS, &tmp);
>    speex_decoder_ctl(dec, SPEEX_SET_HIGHPASS, &tmp);
>
> - Jim
>
> ----- Original Message -----
> From: "Aviv Tamar" <AVIVT at il.ibm.com>
> To: <speex-dev at xiph.org>
> Sent: Thursday, July 12, 2007 10:18 AM
> Subject: [Speex-dev] Quality degradation on new versions
>
>
> >
> > Hi,
> > I have been using speex version 1.0.5 on a text-to-speech program.
> > Recently
> > I upgraded to version 1.2beta1
> > and noticed that the waveform the I got after encoding and decoding on
the
> > new versions (beta1,beta2) is much
> > more different than the original than on version 1.0.5. I also ran a
PESQ
> > comparison test on 700 voice samples
> > and got better results in the older version  (I used quality 9, and
> > disabled perceptual enhancement).
> > Do you know what can cause these changes?
> > My application requires the waveform after decoding to be as similar in
> > shape to the original, so if the difference
> > is the result of some new addition to the encoder i would like to know
how
> > to turn it off.
> > Thanks,
> >
> > Aviv
> >
> > _______________________________________________
> > Speex-dev mailing list
> > Speex-dev at xiph.org
> > http://lists.xiph.org/mailman/listinfo/speex-dev
> >
>
>
> _______________________________________________
> Speex-dev mailing list
> Speex-dev at xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev