[Mp4-tech] Re: [MPEG-4 Audio] Error Concealment in MPEG-4 HE-AAC Profile

[Ralph Sperschneider]

Hello Veenit Vora,
please find some answers to your comments in line.
Vora, Veenit wrote:
> Hello Everyone,
> 
> I am working on the HEAAC profile (AAC-LC + SBR) of the MPEG-4 standard.
> 
> I had the following queries regarding Error Concelament of an encoded bitstream which is obtained by applying the above-mentioned AOTs to the audio stream:
> 
> 1. Is Error Concealment possible for this profile?

Yes!
> 2. If Error Concelament is possible for this profile, is the procedure/algorithm for Error Concealment standardised by MPEG-4 (where can one find the standardised procedure for Error Concelament in the MPEG-4 standard or are there any other documents that give the proedure/algorithm for this profile)?

MPEG deals with error-free data only. Thus, MPEG does not define any 
procedure/algorithm for error concealment.
However, 3GPP has specified appropriate concealment techniques, see 
http://www.3gpp.org/ftp/Specs/archive/26_series/26.402/26402-700.zip
> 3. Are there test streams available to test the Error Concelament tool (for the HEAAC profile) and what would be its conformance criteria?

To my knowledge no test streams to test the decoder concealment are available.
Best regards,
Ralph
> 
> Thanking everyone in advance. Awaiting an early reply.
> 
> Regards,
> Veenit Vora.
> Patni Computer Systems Ltd.,
> Unit No. 19, SDF 7,
> SEEPZ, Andheri (E),
> Mumbai - 400096.
> Tel: +91-22-28291454. Ext: 5806
> 
> 
> http://www.patni.com
> World-Wide Partnerships. World-Class Solutions.

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Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
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