Organisation internationale de normalisation

Task Group discussions

1. 3D Audio Phase 1

Adrian Murtaza, FhG-IIS, presented

m36531

Software for MPEG-H 3D audio RM5

Michael Fischer, Adrian Murtaza, Johannes Hilpert, Christian Ertel, Simone Fueg, Michael Meier, Alexander KrÌ_ger, Florian Keiler, Sven Kordon, Jeongil Seo, Henney Oh, Taegyu Lee, Nils Peters, Deep Sen, Charles Verron, Gregory Pallone

The contribution lists the many updates that were added to the Reference Software to make it in line with the Phase 1 text. The software is in the zip archive of the contribution.

It was the consensus of the Audio subgroup to take the contribution and make it RM5 of the Working Draft for MPEG-H Reference Software.

Nils Peters, Qualcomm, presented

m36568

Proposed Changes and Bug-fixes for RM5 Reference Software

Nils Peters, Moo-Young Kim, James Jeongook, Deep Sen

The contribution reports bug fixes in the Reference Software attached to m36531. The corrections pertained to:

• 
  Software header
  
• 
  HOAFrame() alignment
  
• 
  Window interpolation for HOA vector-based coding
  
• 
  Syntax bug in HOA layered coding
  

Some of the proposed fixes change the decoded waveforms, while some change bitstream and decoded waveforms.

Oliver Wiebolt, Technicolor, noted that the layered coding bug was Phase 2 software, and further wished to discuss and check the proposal.

It was the consensus of the Audio subgroup to take the “Phase 1” fixes proposed in the contribution and merge it into RM5 of the Working Draft for MPEG-H Reference Software.

Gregory Pallone, Orange, presented

m36537

Proposed modifications to Phase1 reference software

Gregory Pallone, Charles Verron

The contribution proposes to change the FFT code in the binauralization engine of the Phase 1 RM. The change will result in only one FFT implementation being used in the 3D Audio code base. The contribution gave evidence that the change in FFT code resulted in rounding errors on the order of 10^(-15).

It was the consensus of the Audio subgroup to take the FFT fix proposed in the contribution and merge it into RM5 of the Working Draft for MPEG-H Reference Software.

Taegyu Lee, Yonsei Univerisity,

m36513

Report on Update to 3D Audio Binaural Renderer Reference Software

Taegyu Lee, Young-cheol Park, Dae Hee Youn, Henney Oh, Jin Sam Kwak, Jeongil Seo

At the 111^th MPEG meeting it was decided to permit the variables kConv, kMax to be set at run time, e.g. in the parameterization configuration. However, this was not implemented in the reference software code base.

It was the consensus of the Audio subgroup to take the kConv, kMax fix proposed in the contribution and merge it into RM5 of the Working Draft for MPEG-H Reference Software.

Taegyu Lee, Yonsei Univerisity,

m36518

Further thoughts on Conformance Test for MPEG-H 3D Audio Binauralization

Taegyu Lee, Young-cheol Park, Dae Hee Youn, Henney Oh, Jin Sam Kwak, Jeongil Seo

The contribution proposes conformance points associated with the FD Binauralization and also proposes parameters that could be varied when defining conformance stream data.

First conformance test:

Inputs: BRIR waveforms

Outputs: FD/TD binaural parameter bitstream

Second conformance test:

Inputs: FD/TD binaural parameter bitstream, multi-channel signal waveforms

Outputs: 2-channel binauralized signal waveforms

Finally, it presented first thoughts on Conformance criterion, e.g. allowable differences for conformant implementations.

This will continue to be discussed.

2.