Organisation internationale de normalisation

3D Audio AMD 3 (Phase 2)

Kai WU, Panasonic Singapore, presented

m37827

Proposed simplification of HOA parts in MPEG-H 3D Audio Phase 2

Hiroyuki EHARA, Sua-Hong NEO, Kai WU

The contribution raises concerns on Near Field Compensation (NFC) in LC Profile.

The contribution notes the following:

To avoid creating such a confusing and difficult standard, this alternative option between “lower HOA order with NFC” and “higher HOA order without NFC” should be removed, and the low complexity should be guaranteed for the HOA tools. There are four options of countermeasure as follows:

1) Always enable NFC (no order restriction on the NFC usage)

2) Always enable NFC (reduce the HOA order restriction in each level to the order where NFC can be applied)

3) Always disable NFC (LCP does not support NFC)

4) Disable HOA (LCP does not support HOA)

The contribution discusses how each option could be specified in the LC profile text.

In conclusion, the presenter stated support for option 3), which would require the following text:

If option-3 is chosen,

1. 
   remove NFC from LCP in Table P1 in [1] and the corresponding “Note 1”,
   
2. 
   change the “Note 6” in Table P1 in [1] to “Note 6: In order to meet target complexity for the profile/levels, implementers shall use the low-complexity HOA decoder and renderer”,
   
3. 
   remove NFC processing text after Table P4 in [1], and
   
4. 
   add the following text in the introduction part of Section 18 in [1]: “This section specifies the low-complexity HOA decoding and rendering algorithm. In the low-complexity profile, this section overrides the original sections of “HOA decoding” and “HOA rendering” for achieving a reduced complexity, otherwise this section is informative.”
   

The Chair noted that there are two components to the option 3 proposal:

• 
  Remove NFC from LC Profile
  
• 
  Mandate use of the low complexity HOA decoding found in Annex G
  

Max Neuendorf, FhG-IIS, stated that “option 3” proposal would lead to simpler, lower-complexity implementations.

The Chair recommended that experts continue to discuss the issues raised by the Orange

Oliver Wuebbolt, Technicolor, presented

m37770

Corrections and Clarifications on MPEG-H 3D Audio DAM3

Oliver Wuebbolt, Johannes Boehm, Alexander Krueger, Sven Kordon, Florian Keiler

The contribution proposed corrections and clarifications to the DAM3 text concerning HOA processing.

• 
  Clarification of the order of DRC and NFC processing, with both text and a figure.
  
• 
  Restrict application of NFC to only one HOA channel group
  
• 
  Other corrections and clarifications
  

There was discussion on NFC and HOA channel groups between Gregory Pallone, Orange and the presenter. The Chair suggested that this one topic needs further discussion.

With the exception of NFC and HOA channel groups, it was the consensus of the Audio subgroup to incorporate all changes proposed in the contribution into the Study on ISO/IEC 23008-3:2015/DAM 3, to issue from this meeting.

Nils Peters, Qualcomm, presented

m37874

Thoughts on MPEG-H 3D Audio

Nils Peters, Deep Sen, Jeongook Song, Moo Young Kim

The contribution has two categories of proposals

• 
  Extension of CICP tables
  
• 
  HOA issues