opus - Mar 2013 - Audio quality for or different samping rates but same audio bandwidth

Hi,

We have observed a noticeable difference in audio quality for OPUS/24000 with
audio bandwidth set to narrowband mode compared to OPUS/8000. The observation
was that OPUS/8000 have better quality compared to OPUS/24000 in nb mode.

All other settings was the same is this expected behavior?


BR/Olle
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Could you be a little more explicit about what OPUS/24000 means? Are you
calling libopus from C, or using some other encoding method?  What does
"audio bandwidth set to narrowband" mean?  What version of libopus are
you
using?


On Thu, Mar 21, 2013 at 9:51 AM, Olle Frimanson <olle.frimanson at
keystream.se
> wrote:
>  Hi,****
>
> ** **
>
> We have observed a noticeable difference in audio quality for OPUS/24000
> with audio bandwidth set to narrowband mode compared to OPUS/8000. The
> observation was that OPUS/8000 have better quality compared to OPUS/24000
> in nb mode.****
>
> ** **
>
> All other settings was the same is this expected behavior?**
>
> * *
>
> ** **
>
> BR/Olle****
>
> _______________________________________________
> opus mailing list
> opus at xiph.org
> http://lists.xiph.org/mailman/listinfo/opus
>
>
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The other important question is whether the problem happens when you
encode at 24k or when you decode at 24k.

	Jean-Marc

On 03/21/2013 11:35 PM, Benjamin Schwartz wrote:
> Could you be a little more explicit about what OPUS/24000 means? Are you
> calling libopus from C, or using some other encoding method?  What does
> "audio bandwidth set to narrowband" mean?  What version of
libopus are
> you using?
> 
> 
> On Thu, Mar 21, 2013 at 9:51 AM, Olle Frimanson
> <olle.frimanson at keystream.se <mailto:olle.frimanson at
keystream.se>> wrote:
> 
>     Hi,____
> 
>     __ __
> 
>     We have observed a noticeable difference in audio quality for
>     OPUS/24000 with audio bandwidth set to narrowband mode compared to
>     OPUS/8000. The observation was that OPUS/8000 have better quality
>     compared to OPUS/24000 in nb mode.____
> 
>     __ __
> 
>     All other settings was the same is this expected behavior?*/____/*
> 
>     */__ __/*
> 
>     __ __
> 
>     BR/Olle____
> 
> 
>     _______________________________________________
>     opus mailing list
>     opus at xiph.org <mailto:opus at xiph.org>
>     http://lists.xiph.org/mailman/listinfo/opus
> 
> 
> 
> 
> _______________________________________________
> opus mailing list
> opus at xiph.org
> http://lists.xiph.org/mailman/listinfo/opus
>

Hi,
I wrote a small test program to illustrate the problem. But when using the test
program we get expected quality, so we must be doing something wrong in out
original code. I will have a closer look at out original code to see what we are
doing wrong.

Best regards,
Dan
>The other important question is whether the problem happens when you
>encode at 24k or when you decode at 24k.
>
>	Jean-Marc
>
>On 03/21/2013 11:35 PM, Benjamin Schwartz wrote:
>>/  Could you be a little more explicit about what OPUS/24000 means? Are
you
/>>/  calling libopus from C, or using some other encoding method?  What
does
/>>/  "audio bandwidth set to narrowband" mean?  What version of
libopus are
/>>/  you using?
/>>/  
/>>/  
/>>/  On Thu, Mar 21, 2013 at 9:51 AM, Olle Frimanson
/>>/  <olle.frimanson at keystream.se 
<http://lists.xiph.org/mailman/listinfo/opus>  <mailto:olle.frimanson
at keystream.se  <http://lists.xiph.org/mailman/listinfo/opus>>>
wrote:
/>>/  
/>>/      Hi,____
/>>/  
/>>/      __ __
/>>/  
/>>/      We have observed a noticeable difference in audio quality for
/>>/      OPUS/24000 with audio bandwidth set to narrowband mode compared
to
/>>/      OPUS/8000. The observation was that OPUS/8000 have better
quality
/>>/      compared to OPUS/24000 in nb mode.____
/>>/  
/>>/      __ __
/>>/  
/>>/      All other settings was the same is this expected
behavior?*/____/*
/>>/  
/>>/      */__ __/*
/>>/  
/>>/      __ __
/>>/  
/>>/      BR/Olle____
/>>/  
/>>/  
/>>/      _______________________________________________
/>>/      opus mailing list
/>>/      opus at xiph.org 
<http://lists.xiph.org/mailman/listinfo/opus>  <mailto:opus at xiph.org
<http://lists.xiph.org/mailman/listinfo/opus>>
/>>/      http://lists.xiph.org/mailman/listinfo/opus
/>>/  
/>>/  
/>>/  
/>>/  
/>>/  _______________________________________________
/>>/  opus mailing list
/>>/  opus at xiph.org 
<http://lists.xiph.org/mailman/listinfo/opus>
/>>/  http://lists.xiph.org/mailman/listinfo/opus
/>>/  

/

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