International organisation for standardisation

Mid-week report:

The break-out group reported back that there were changes to the proposed text in the contribution and also additional informative text about how to utilize the MBO feature in various application scenarios (e.g. karaoke).

It was the consensus of the Audio Subgroup to incorporate the revised text on MBO into the SAOC FDIS text.

Gregory Pallone, Orange Labs, presented

m17327

Cross check of proposed SAOC quantization scheme improvement

Pierrick Philippe Gregory Pallone

The contribution presented cross-check listening test results. The test used the MUSHRA methodology and absolute score analysis showed that one item is better for the new quantization scheme, none is worse and that the mean score averaged over all items is not different.

Oliver Hellmuth, FhG, presented

m17268

Proposal for improvement of SAOC parameter quantization schemes

Jonas Engdegård Heiko Purnhagen Andreas Hölzer Johannes Hilpert Jürgen Herre Oliver Hellmuth

The contribution notes that the following situation may occur:

• 
  There are two microphones at a telecom location, one for each of two talkers.
  
• 
  One talker is active and there is some leakage into the other microphone. The result is two objects containing the same signal but at very different levels. This situation is an extreme case that tests the dynamic range of the quantization scheme such that, in the worst case, the lower level signal is quantized to zero.
  

It proposes to use the MPEG Surround CLD quantization table for the SAOC OLD parameters.

The results of a listening test on the performance of the proposed quantizer are presented, which showed two items better, none worse and that the average over all items is better. It further noted that for one item, Telco, an improvement of more than 30 MUSHRA points is achieved. This result is consistent with the previous contribution.

It was the consensus of the Audio subgroup to incorporate the changes in this contribution into the SAOC FDIS text.

Henney Oh, LG, presented

m17288

Report on lossless coding in SAOC, LD-SAOC and LD-MPS

Henney Oh

The contribution reports on lossless parameter coding in SAOC, LD-SAOC and LD-MPS: Grouped PCM, Piliot-based, differential in frequency, backward differential in time and forward differential in time. These coding methods can be followed by Huffman coding as 1 dimensional, frequency-paired 2 dimensional and time-paired 2 dimensional. The compression efficiency of each of these tools was investigated.

For example, it reports that the bit savings per lossless coding tool in SAOC-RM using the SAOC CfP items is as follows: