[Mp4-tech] Re: Query on channel coupling in AAC

[Ralph Sperschneider]

Dear Anil,
what exactly do you mean with "channel coupling control"?
In AAC, you might have dependently and independently switched coupling channels. 
Those channels are actually not output on its own, but they are coupled to the 
Main audio channels (SCE, CPE). Coupling control information is provided to 
control this coupling process (which coupling channel is coupled to what extend 
to which main channel).
The coupling mechanism has been specified in MPEG-2 AAC and has been reused in 
MPEG-4 AAC. It is applicaple to AAC Main, AAC LC, AAC SSR and AAC LPT. Please 
not that the number of coupling channels is limited by the profile and level 
specification.
Hope this helps.
Ralph
Anil Kumar wrote:
> Hi all, 
> 	I had a few queries about channel coupling element. What is channel coupling control? Is this applicable only for > 2 channels? What are the benefits of CCC? Is this a MP2 or MP4 capability? 
> 
> Hoping for some answers in this regard,
> Thanks,
> Anil
> 
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