International organisation for standardisation organisation internationale de normalisation

2.8.2Miscellaneous

The Chair raised the following issues in order to assess interest and to schedule task group break-outs for later in the week:

• 
  SAOC timetable
  
• 
  Normative start-up and shut-down of audio coders, e.g. AAC, HE-AAC as described in N8837.
  
• 
  SVN repository for audio
  

3Record of AhG meetings

3.1AhG Meeting on SAOC and USAC Sunday 1000-1700

3.1.1SAOC

Oliver Hellmuth, FhG, presented

m16310

Clarifications regarding the enhanced Karaoke/Solo processing mode

Leonid Terentiev Jürgen Herre Cornelia Falch Oliver Hellmuth

This contribution presents information requested by LG at the 87^th meeting. The points discussed were:

• 
  Combining regular mode and Enhanced Karaoke/Solo mode (EKS).
  
• 
  Decoder processing in regular vs. EKS mode (wrt prediction or energy based decoding).
  
• 
  Mapping of residual signals to objects.
  

The Chair noted that language clarifying the topic of the last bullet item should be included into the FCD text.

Jeongil Seo, ETRI, asked a number of questions aimed at better understanding the limitations of the current specification. This discussion will be continued via e-mail since one FhG expert, Leonid Terentiev, was unable to attend this meeting.

Heiko Purnhagen, Dolby, presented

m16309

Report on corrections for the MPEG SAOC FCD text

Jonas Engdegård Heiko Purnhagen Cornelia Falch Leonid Terentiev Andreas Hölzer Oliver Hellmuth Johannes Hilpert Jeroen Koppens

This contribution presented a number of editorial corrections or technical clarifications to the FCD text. In addition, it proposes to draft changes to MPEG-2 AAC and MPEG-4 Audio and MPEG Surround (on carriage of SAOC in the core coder bitstreams or in MPEG Surround bitstreams) for use as amendments to MPEG-2 AAC, MPEG-4 Audio and MPEG Surround.

It was the consensus of the group to put the editorial corrections or technical clarifications into the FCD text and, secondly, to draft text for use in amending MPEG-2 AAC, MPEG-4 Audio and MPEG Surround.

Jeongil Seo, ETRI, presented

m16363

Test Sequence Proposal for SAOC Verification Test

Jeongil Seo Kyeongok Kang Kevin SeungChul Ham

This contribution makes available to MPEG for use in the Verification Test of SAOC several items from the Korean Music 2.0 project. These will be made available to the Verification Test Encoding Administrator to construct Reference rendering and SAOC rendering waveforms.

Juergen Herre, FhG, presented

m16384

Details of NB Position on SAOC Ballot

Juergen Herre for GNB

This contribution gives details on the German NB position on the SAOC FCD ballot (which closed March 14, 2009). The ballot comment requests the usual correction of errors and clarification of text, plus requests that a number of technical changes be incorporated into the SAOC FDIS. These are

• 
  Definition of profiles and levels
  
• 
  Control of requests for “extreme” rendering that may result in artefacts in the processed signal.
  
• 
  Expand the specification to support low-delay encoding multiple objects that are rendered as a multichannel signal.
  

The contribution further indicates technical changes that are required, editorial changes that are recommended and technical changes that are desirable.

The Chair noted that transport of SAOC in base audio coder bitstreams is covered in the previous contribution. The Chair also noted that it would be very desirable to have the results of the formal Verification Test available at the same MPEG meeting that the FDIS text is approved.

Jeongil Seo, ETRI, acknowledged that there is additional work to be done, but that more that two meetings delay impact the personal music mix applications for SAOC in the marketplace.

The Chair requested that a workplan be drafted for approval at this meeting that organizes the first components of the work requested by the German NB.