<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi -<br><div><br class="Apple-interchange-newline"><blockquote type="cite">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 :-)<br></blockquote><div><br></div><div>for any kind of musical interaction I seriously recommend using CELT in order to keep latency as low as possible. In that sense CELT is the best choice really. You might be interested to take a look at <a href="http://www.soundjack.eu">http://www.soundjack.eu</a>, which also uses CELT.</div><div><br></div><div>Hope that helps,</div><div>best</div><div><br></div><div>-- A l e x</div><br><blockquote type="cite"><br><div class="gmail_quote">
On Thu, Aug 5, 2010 at 11:06 PM, Gregory Maxwell <span dir="ltr"><<a href="mailto:gmaxwell@gmail.com">gmaxwell@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im">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?<br>
<br>
</div>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><br>
</blockquote></div><br>
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<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div>Dr.-Ing. Alexander Carôt <br>Email : <a href="mailto:Alexander@Carot.de">Alexander@Carot.de</a> <br>Tel.: +49 (0)177 5719797 </div></span>
</div>
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