Organisation internationale de normalisation

5.2.3MPEG-D SAOC

Yang-Won Jung, LG, presented

m15588

Comments on SAOC operation modes and module

Yang-Won Jung Henney Oh

This contribution notes that there a number of “missing” modes in SAOC operation, and presents a table summarizing the currently supported modes and the proposed “missing” modes. Discussion was deferred until after the next presentation.

Oliver Hellmuth, FhG. presented

m15634

Proposal for adoption of additional downmix / upmix scenarios for the MPEG SAOC system

hel @ iis.fraunhofer.de hlp @ iis.fraunhofer.de mun @ iis.fraunhofer.de fch @ iis.fraunhofer.de tev @ iis.fraunhofer.de heiko.purnhagen @ dolby.com JENGD @ dolby.com jeroen.koppens @ philips.com

This contribution proposes adding the same modes to SAOC as was proposed in the previous contribution. A mathematical description of the SAOC processing for the missing modes was presented. Furthermore, it proposes to explicitly describe how a SAOC decoder can be connected to a MPEG Surround decoder by means of a stream of unquantized parameters. Listening test data was presented that show that two of the missing modes implemented via an SAOC decoder operate as well as the implementation of SAOC transcoder plus MPEG Surround decoder. All modes except stereo to binaural have software implementation.

It was the consensus of the Audio Subgroup that all modes except stereo to binaural processing be incorporated into the CD text. Also, that the text describing how a SAOC decoder can be connected to a MPEG Surround decoder by means of a stream of unquantized parameters be incorporated into the CD text.

Leonid Terentiev, FhG, presented

m15636

Proposal for the file-based storage of rendering information for the MPEG SAOC system

Jonas Engdegård Leonid Terentiev Cornelia Falch Oliver Hellmuth Johannes Hilpert

The contribution presents a format for storing and retrieving the rendering information. It was the consensus of the Audio Subgroup to incorporate this text into the SAOC CD text.

Osamu Shimada, NEC, presented

m15576

A Proposal on preset functionality for teleconferencing application

Osamu Shimada Keisuke Masatoki Toshiyuki Nomura Akihiko Sugiyama Osamu Hoshuyama Hiroshi Saruwatari

This contribution proposes to derive lateralization from the “cross-talk” of participants in a multi-microphone teleconferencing setting. It proposes that presets should be dynamic in time and frequency. This permits the decoder to reconstruct the original microphone signals, but still enable manipulation of the actual objects.

The Audio Subgroup welcomes additional information at the next meeting.

Leonid Terentiev, FhG, presented

m15633

Additional information on the mono downmix mode for the enhanced Karaoke / Solo processing for the MPEG SAOC system

Leonid Terentiev Cornelia Falch Oliver Hellmuth Johannes Hilpert

FhG will be able to provide processed signals for informal listening. The Chair suggested that this topic be brought up again Thursday afternoon of the MPEG week.

Heiko Purnhagen, Dolby, presented

m15635

Report on corrections for the MPEG SAOC CD text

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

This contribution presents

• 
  Editorial corrections to the SAOC CD text.
  
• 
  Minor technical “bug-fixes” to the CD text.
  
• 
  New syntax text that clearly indicates that meta-data strings can be UTF-8 byte strings.
  
• 
  Proposed solution for instability in SAOC processing noted at the 84^th Meeting.
  

It was the consensus of the Audio Subgroup to adopt all aspects of the contribution into the SAOC CD text.

Yang-Won Jung, LGE, presented

m15587

Proposed syntax revision for redundancy reduction in SAOC

Yang-Won Jung Henney Oh

The contribution proposes syntax revisions that reduce the number of required bits in the SAOC audioSpecificConfig() header. Heiko Purnhagen, Dolby, noted that the proposed syntax was too restrictive and could not support the flexibility in the SAOC CD text. He agreed to draft alternate syntax text that captures the improvement in coding efficiency. This would include an example of bitrate savings in a typical application. No decision on this contribution is made at this time, but the topic will be revisited when the group reviewed the text from Dolby.

After subsequent discussion, it was the consensus of the Audio Subgroup to adopt the technology as it was in the presentation to the Audio Subgroup.

Jeongil Seo, ETRI, presented

m15592

Proposal for support of the additional downmix by MPEG SAOC

Jeongil Seo Seungkwon Beack Kyeongok Kang Kwangki Kim

The proposal shows how to adapt the artistic downmix gain concept from MPEG Surround to SAOC for the purpose of using a “Mastered Mix” to drive a SAOC decoder. The concept is proposed to be a new core experiment. A break-out will discuss the proposal and report back.

Osamu Shimada, NEC, presented

m15575

Listening test results of Test 2 for SAOC CE on separating real-environment signals into multiple objects

Osamu Shimada Toshiyuki Nomura Akihiko Sugiyama Osamu Hoshuyama