International organisation for standardisation organisation internationale de normalisation

3D Audio HOA

Deep Sen and Nils Peters, Qualcomm, presented

m31827

RM1-HOA Working Draft Text

[e-mail], [e-mail], Pei Xiang, Sang Ryu (Qualcomm), Johannes Boehm, Peter Jax, Florian Keiler, Sven Kordon, Alexander Krueger, Oliver Wuebbolt (Technicolor), Gregory Pallone, Marc Emerit, Jerome Daniel (Orange)

Deep Sen reviewed the changes made to RM0-HOA to incorporate the Qualcomm technology and to create RM1-HOA. Many of the changes relate to how the Predominant sound is coded: either Ambiance-based (as in RM0) or Vector-based (which what is added to RM0).

Nils Peters reviewed the changes to the encoder is described in Annex B of the contribution.

Oliver Weubbolt, Technicolor, commented on the style of the encoder WD text and recommended some editorial changes.

It was the consensus of the Audio subgroup to make this contribution Text of MPEG-H 3D Audio WD1-HOA, with additional editorial changes suggested by Oliver Weubbolt.

m32077

RM1-HOA Reference Software

D. Sen, N. Peters, P. Xiang, S. Ryu, Johannes Boehm, Peter Jax, Florian Keiler, Sven Kordon, Alexander Krueger, Oliver Wuebbolt, Gregory Pallone, Marc Emerit, Jerome Daniel

It was the consensus of the Audio subgroup to make the software in this contribution’s zip archive MPEG-H 3D Audio RM1-HOA.
Oliver Weubbolt, Technicolor, presented

m32246	Proposed changes to the bitstream of RM0-HOA for integration of Qualcomm CE	Johannes Boehm, Peter Jax, Florian Keiler, Sven Kordon, Alexander Krueger, Oliver Wuebbolt, Deep Sen, Nils Peters
m32247	Revised HOA-RM0 Reference Software to embed Qualcomm directional sound coding CE	Johannes Boehm, Peter Jax, Florian Keiler, Sven Kordon, Alexander Krueger, Oliver Wuebbolt, Deep Sen, Nils Peters

The contributions propose

• 
  Changes to RM-HOA bitstream to make it
  
  • 
    More flexible (to accommodate Technicolor and Qualcom Predominant Sound coding).
    
  • 
    More understandable (with a clearer structure)
    
  • 
    More efficient syntax
    
• 
  Fixes to two bugs identified in m32247.
  

The changes to RM-HOA permit the predominant sound coding method (i.e. Vector or Ambiance) to be selected per frame (which is supported in m31827) and also per transmitted core coder channel (which is the extension proposed in m32246).

Plots in the first contribution show the impact of the proposed changes on side information bitrate. The proposed changes do not affect the decoded waveform. In general, they showed that this bitrate was always lower.

A summary of proposed changes are:

• 
  Adaption of field ranges or sizes
  
• 
  Removal of redundant fields
  
• 
  Changes to support integration of the Qualcomm technology
  
• 
  Re-formatting of bitstream to increase clarity
  

The presenter gave a more detailed explanation of how each change was implemented in the WD syntax. Additionally, the two bugs and associated fixes were discussed.

It was the consensus of the Audio subgroup to incorporate the changes proposed in the contributions into the text of MPEG-H 3D Audio WD1-HOA and to reflect these changes into MPEG-H 3D Audio RM1-HOA reference software. These changes will be done during a two week editing period.