But Cisco adopts HE-AAC in it's telepresence product which is the dominant HD video conference product. They use hardware to decrease the delay?<br><br><div class="gmail_quote">On Thu, Aug 5, 2010 at 9:59 PM, Alex Converse <span dir="ltr"><<a href="mailto:alex.converse@gmail.com">alex.converse@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><div></div><div class="h5">On Thu, Aug 5, 2010 at 9:49 AM, wei <<a href="mailto:tsingmei@gmail.com">tsingmei@gmail.com</a>> wrote:<br>
> Hi ,<br>
><br>
> I visited celt website. I saw the comparison between AAC-LD with celt. But<br>
> how about the HE-AAC? If the scenario is that we limit the bandwidth to<br>
> 50kbps, will music encoded by HE-AAC v2 be better than CELT? What's HE-AAC<br>
> v2's delay?<br>
><br>
<br>
</div></div>He-AACv2 is not a low delay codec at all. It is much worse than<br>
AAC-LC. It has a delay of about 405 ms.<br>
<br>
See <a href="http://www.eetimes.com/design/audio-design/4015911/Algorithmic-delay-and-synchronization-in-MPEG-audio-codecs" target="_blank">http://www.eetimes.com/design/audio-design/4015911/Algorithmic-delay-and-synchronization-in-MPEG-audio-codecs</a><br>
for a full analysis<br>
<br>
Regards,<br>
<font color="#888888">Alex Converse<br>
</font></blockquote></div><br>