[Speex-dev] Quality degradation on new versions

[Jim Crichton]

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
>
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