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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We’re using CELT 0.7.1 in a real-time system at rates around 48
kBit/s and the audio quality is surprisingly good. I would say comparable to a
good VHF-FM stereo reception.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Von:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
celt-dev-bounces@xiph.org [mailto:celt-dev-bounces@xiph.org] <b>Im Auftrag von </b>wei<br>
<b>Gesendet:</b> Donnerstag, 5. August 2010 17:11<br>
<b>An:</b> Gregory Maxwell<br>
<b>Cc:</b> celt-dev@xiph.org<br>
<b>Betreff:</b> Re: [CELT-dev] One question about comparison between HE-AAC v2
and CELT<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Thank you. If I want to
implement an internet based Karaoke software, and the bandwidth is around
50kbps, should I use Celt or AAC LD? I want to ensure the stereo effect in the
software :-)<o:p></o:p></p>
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<p class=MsoNormal>On Thu, Aug 5, 2010 at 11:06 PM, Gregory Maxwell <<a
href="mailto:gmaxwell@gmail.com">gmaxwell@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>On Thu, Aug 5, 2010 at 11:01
AM, wei <<a href="mailto:tsingmei@gmail.com">tsingmei@gmail.com</a>>
wrote:<br>
> But Cisco adopts HE-AAC in it's telepresence product which is the dominant<br>
> HD video conference product. They use hardware to decrease the delay?<o:p></o:p></p>
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<p class=MsoNormal>The delay we're talking about is algorithmic delay. You
can't reduce<br>
it with faster hardware. You can only reduce it via changing the<br>
format (or sometimes by increasing the sampling rate).<br>
<br>
I believe all AAC using Cisco telepresence equipment that I've seen uses
AAC-LD.<br>
<br>
For example:<br>
<br>
<a
href="http://www.cisco.com/en/US/prod/collateral/ps7060/ps8329/ps8330/ps9573/data_sheet_c78-457905.html"
target="_blank">http://www.cisco.com/en/US/prod/collateral/ps7060/ps8329/ps8330/ps9573/data_sheet_c78-457905.html</a><br>
<br>
Also:<br>
<br>
<a
href="http://www.thefreelibrary.com/Cisco+TelePresence+System+Uses+Fraunhofer+IIS+AAC-Low+Delay+Audio...-a0161912048"
target="_blank">http://www.thefreelibrary.com/Cisco+TelePresence+System+Uses+Fraunhofer+IIS+AAC-Low+Delay+Audio...-a0161912048</a><br>
<br>
Example configurations here show AAC-LD:<br>
<br>
<a href="https://supportforums.cisco.com/message/3140710" target="_blank">https://supportforums.cisco.com/message/3140710</a><o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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