International organisation for standardisation

Bitrate	Mushra Analysis
Result
20 kb/s mono	Absolute	1 item better: te15
20 kb/s mono	Differential	1 better, mean better
24 kb/s mono	Differential	2 better, mean better

Markus Multrus, FhG, noted that the purpose of MPEG is to create standards that promote interoperability, and expressed concern that the enhanced USAC “open source” encoder does not produce a normative bitstream. This would create confusion in the marketplace.

The Chair noted that the ETRI TCX windowing is to a large extent about the bit allocation required for noise shaping, in that the coding modes to compare are:

• 
  FD mode in short blocks with scale factors for noise shaping
  
• 
  TCX mode with LP envelope for noise shaping
  

Jeongook Song, Yonsei University, presented

m20026

Status report on USAC Reference Software JAME

Jeongook Song, Henney Oh, Hong-Goo Kang

The contribution reports on the status of the JAME USAC Reference Software project. The JAME source code is available at:

http://wg11.sc29.org/svn/repos/MPEG-D/branches/JAME

The functionality of JAME can be summarized as follows:

• 
  When decoding the RM9 reference bitstreams, the JAME 0.9.1 decoder generates bit-identical decoded waveforms as the MPEG normative decoder.
  
• 
  The Jame 0.9.1 encoder has all the functionality as found in the RM9 MPEG informative encoder.
  

The presenter reported that the missing modules that would make the greatest quality improvement are, in FD mode:

• 
  Psychoacoustic model
  
• 
  Bit allocation module (i.e. determining sectioning and scale factors)
  

In addition, JAME is missing

• 
  The “enhanced” components of eSBR
  
• 
  Stereo tools
  
• 
  MPEG Surround 212 tool
  

Chair proposed to have a workplan from this meeting to progress the Jame software encoder with the goal of achieving very good performance when coding mono signals.