Organisation internationale de normalisation

960/1024 block length

Andreas Schneider, Dolby, presented

m15641

further considerations regarding the 960 transform length in the AAC profile, the HE AAC profile and the HE AAC v2 profile

Andreas Schneider

The contribution reviewed

• 
  the external specifications that use one block length or the other
  
• 
  the reference source code available (or not available) for guiding implementers
  
• 
  risk of leakage of content from block-length “island” to the other
  

Ralph Sperschneider, FhG, presented

m15645

Overhead consideration for an AAC decoder that supports both frame lengths compared to an AAC decoder that supports only one frame length

Bernhard Grill Marc Gayer Markus Multrus Johannes Hilpert Ralph Sperschneider

The contribution gives an analysis of the relative complexity of implementing 1024 vs 960 block length AAC decoders.