[Mp4-tech] Re: Format of stereo signal in AAC bitstream

[Ralph Sperschneider]

Senthil wrote:
> Hi Gururaj Bhat,
>    
> For a stereo signal , does the standard tell that it should be 
> implemented as CPE?
> or two SCE's also allowed? (in a raw data block )
>  
>    There is no restriction like stereo signal should be coded as CPE 
> only, it could be  two  separate SCE also.
> This kind of bit stream is called as dual mono streams. In these cases 
> we will not apply Mid Stereo and Intensity Stereo
>  From raw data block itself it will come as a SCE only. I hope this 
> answers for your question.

Generally speaking - this is true.
However: channel_config=2 requests a CPE. Using two SCEs would require 
channel_config=0.
Best regards,
Ralph
>  
>  
> Thanks
> Senthil.
>  
> 
>     ----- Original Message -----
>     *From:* Gururaj Bhat <mailto:bs.guru gmail.com>
>     *To:* mp4-tech lists.mpegif.org <mailto:mp4-tech lists.mpegif.org>
>     *Sent:* Wednesday, May 16, 2024 2:32 PM
>     *Subject:* [Mp4-tech] Format of stereo signal in AAC bitstream
> 
>     Hi all,
>      
>     I have a query about the implementation of AAC.
>      
>     For a stereo signal , does the standard tell that it should be
>     implemented as CPE?
>     or two SCE's also allowed? (in a raw data block )
>      
>     Thanks in advance,
>     Gururaj Bhat 
> 
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Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
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