[CELT-dev] One question about comparison between HE-AAC v2 and CELT

Feilen, Michael michael.feilen at tum.de
Thu Aug 5 08:39:42 PDT 2010

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.

Von: celt-dev-bounces at xiph.org [mailto:celt-dev-bounces at xiph.org] Im Auftrag von wei
Gesendet: Donnerstag, 5. August 2010 17:11
An: Gregory Maxwell
Cc: celt-dev at xiph.org
Betreff: Re: [CELT-dev] One question about comparison between HE-AAC v2 and CELT

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 :-)
On Thu, Aug 5, 2010 at 11:06 PM, Gregory Maxwell <gmaxwell at gmail.com<mailto:gmaxwell at gmail.com>> wrote:
On Thu, Aug 5, 2010 at 11:01 AM, wei <tsingmei at gmail.com<mailto:tsingmei at gmail.com>> wrote:
> 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?
The delay we're talking about is algorithmic delay. You can't reduce
it with faster hardware. You can only reduce it via changing the
format (or sometimes by increasing the sampling rate).

I believe all AAC using Cisco telepresence equipment that I've seen uses AAC-LD.

For example:




Example configurations here show AAC-LD:


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