International organisation for standardisation organisation internationale de normalisation

Further discussion

Max Neuendorf, FhG, presented new information on the relative frequency of this window transition for the 9 operating modes when coding the CfP items. On average, there were approximately 10 such transitions for each operating mode for the set of concatenated items.

Juergen Herre, FhG, noted that a CEs cannot necessarily be judged on compression efficiency alone, but rather there may be an engineering design issue (i.e. “clean design”) that may also play a factor. Herve Taddei, Huawei, urged the group to insure that all CEs are treated fairly and judged using the same decision criterion. The Chair noted that he very much agreed with this comment.

Eunmi Oh, Samsung, presented

m16376

Proposed Changes to WD2 for Phase Coding

JungHoe Kim Julien Robilliard Eunmi Oh Bernhard Grill

This contribution relates to previously presented contributions m16312, m16339, m16456, m16374.

First the presenter showed additional listening test results when all listening test sites are averaged together. The pooled results showed that the performance of RM+CE, at the 95% level of significance:

• 
  at 24 kb/s stereo, six items were better than RM, one was worse and the overall average was better
  
• 
  at 32 kb/s stereo, seven items were better than RM, none were worse and the overall average was better
  

The contribution presents WD changes needed for the Phase Coding CE (syntax tables and decoding semantics text).

Kristofer Kjörling, Dolby, noted that the syntax in the contribution shows MPEG Surround pilot-based coding apparently used with IPD parameters. The presenter will check whether this is intentional or is an editing error.

The Chair verified that the following issues must be addressed before experts can make a final decision on this CE:

• 
  clarify pilot-based syntax
  
• 
  clarify whether syntax and sematics are consistent (e.g. bsIPDdataMode[][])
  
• 
  experts at Philips and Dolby will assess whether smoothing gives benefit for a critical item