[Vorbis-dev] Vorbis for digital radio at low bitrates

[Feilen, Michael]

Dear Vorbis Devteam,

My name is Michael Feilen and I've been working on Digital Radio Mondiale (DRM) transmitters and receivers for quite a while now. DRM uses HE-AACv2 by Dolby to encode the audio content (see http://www.drm.org/uploads/media/es_201980v030101p.pdf - pages 23 ff). As I think Vorbis is an excellent alternative, I'd like to implement and define an interface for Vorbis encoded audio as unofficial amendment to the standard and I would be grateful if one of you could help me with the integration.
The encoder requirements for DRM(+) are:
* Support for 12 kHz, 24 kHz and 48 kHz sample rates.
* A frame-format (transform length) of 960 samples per frame. At the moment, the codec seems only to support transform lengths of powers of two (e.g. 512, 1024, ...). 
* Fixed bitrates from 12 kBit/s to ~128 kBit/s.

It would be a great achievement to show the usage of an open codec this digital radio standard! 

Thank you very much!

Kind Regards,
Michael Feilen

-- 
Michael Feilen, M.Sc.
Institute for Integrated Systems (LIS) (http://www.lis.ei.tum.de)
Technische Universität München (TUM)
D-80290 München

Tel.: +49 (0) 89 289 23873
E-mail: michael.feilen at tum.de