Organisation internationale de normalisation

Core coder type	Core coder delay (in ms)	Delay of core coder and SAOC RM (in ms)
Delay of core coder and LD-SAOC (in ms)
AAC LD	21.3	41.3	22.7
AAC ELD	16.0	41.3	17.3
AAC ELD with SBR	33.7	62.7	33.8

This CE proposal needs more technical details and a cross-check listening test. Pierrick Philippe noted that France Telecom R&D would be willing to perform the listening cross-check.

Heiko Purnhagen, Dolby, presented

m15827

Core Experiment on Low Power MPEG SAOC system

Jonas Engdegård Leonid Terentiev Oliver Hellmuth Erik Schuijers

This contribution proposes a core experiment on a “low power” real-valued filterbank for SAOC. This filterbank is similar to what is used in MPEG Surround. The new filterbank has no effect on the bitstream syntax, such that one bitstream can be decoded either by the current filterbank or by the “low power” filterbank. The changes include:

• 
  Real-value filterbank with antialiasing tool
  
• 
  Real-value decorrelators.
  

This is a not a complete proposal, and still requires the following information:

• 
  Complete technical specification
  
• 
  Performance information (optionally with cross-check)
  

It was noted that these changes are only for mono or stereo outputs in SAOC. Multichannel output continues to used MPEG Surround, for which the low-power, real-valued processing is already available. The scope of the CE is currently envisioned to cover the “regular” filterbank and not the low delay filterbank.

ETRI, LG and France Telecom R&D offered to participate in a listening test to verify the performance of the low power filterbank.

Leonid Terentiev, FhG, presented

m15829

Proposal for the integration of the enhanced Karaoke/Solo processing into the decoding modes of the MPEG SAOC system

Leonid Terentiev Cornelia Falch Oliver Hellmuth Johannes Hilpert

This contribution proposes to revise the descriptive text and figures, but does not propose any technical changes. The AhG recommends to the Audio Subgroup check the candidate text for the SAOC FCD.

Leonid Terentiev, FhG, presented

m15830

Report on corrections for the MPEG SAOC CD text and RM software

Leonid Terentiev Cornelia Falch Oliver Hellmuth Johannes Hilpert Heiko Purnhagen Jonas Engdegård Jeroen Koppens

This contribution proposes editorial and technical changes to the SAOC text and reference software. The AhG recommends to the Audio Subgroup that they be incorporated into the SAOC FCD text.

The Chair requested that the SAOC FCD text be available for review by interested parties no later than Thursday morning.

Yang-Won Jung, LG, presented

m15839

Comments on parameter estimation in SAOC

Yang-Won Jung Henney Oh

The contribution discusses a problem with object energy parameters associated with several signals, the problem being that the parameters appear to saturate the energy quantizatizer table. Leonid Terentiev, FhG, noted that the hypothesized energy parameter values would correspond to input signals of unrealistically high level, and that perhaps the LG calculations are not quite correct. The Chair proposed a break-out discussion to clarify this issue, and if the LG calculations were not correct then perhaps the SAOC encoder informative text requires clarification or expansion.

Yang-Won Jung, LG, presented

m15840

Proposed modification on parameter estimation in SAOC

Yang-Won Jung Henney Oh

The contribution presents a means to reduce side information bitrate. As a byproduct, it notes an issue concerning quantization errors in OLD, DMG and DCLD parameters. The AhG recommended that there be a break-out group to discuss these issues which will report to the Audio Subgroup during the week.