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parametric stereo in DRM
NidhiMarathe19
post Jun 12 2013, 12:52
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Hello,

I am currently working on HE AAC v2 for DRM application. I am using a source code from ISO and i see that the parametric stereo feature is not compatible for a 960 transform length as ISO code supports only for 1024 transform length. However they state that it is compatible for 960 length but i see its only for the AAc core decoder.

I am looking for some theory/document which would help me for modifying the parametric stereo tool for 960 transform. I request if any one has come across similar issue or maybe some guidance. It would be very helpful.

Thank you.
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Maurits
post Jun 12 2013, 15:04
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I know that DAB+ digital radio uses HE-AACv2 with PS and also has a transform length of 960. So, it is indeed possible but it appears to be a limitation of the reference implementation, not a technical impossibility.

This post has been edited by Maurits: Jun 12 2013, 15:13
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Maurits
post Jun 12 2013, 18:05
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Actually, on further research on the site behind the link above (Opendigitalradio.org) it turns out they have "A free/open DAB+ encoder". In the changelog for the project they mention "AAC960 works now. All modes: LC/SBR/PS. Only for DAB+, not DRM."

That looks like it could be a good starting point for you.
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NidhiMarathe19
post Jun 12 2013, 22:58
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Hello Maurits,

I got the code and have started looking into it. Thanks a lot. I got some hint ;-)
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Maurits
post Jun 12 2013, 23:27
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QUOTE (NidhiMarathe19 @ Jun 12 2013, 22:58) *
Hello Maurits,

I got the code and have started looking into it. Thanks a lot. I got some hint ;-)

That's good to hear. If you do manage to solve it and are legally able to share the code, it would be nice if you could share your findings/code with the Opendigitalradio project. I'm sure they would like to include AAC960 for DRM+ too...
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