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

[Gregory Maxwell]

On Thu, Aug 5, 2010 at 11:01 AM, wei <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:

http://www.cisco.com/en/US/prod/collateral/ps7060/ps8329/ps8330/ps9573/data_sheet_c78-457905.html

Also:

http://www.thefreelibrary.com/Cisco+TelePresence+System+Uses+Fraunhofer+IIS+AAC-Low+Delay+Audio...-a0161912048

Example configurations here show AAC-LD:

https://supportforums.cisco.com/message/3140710