AAC Evolution
During the long lifespan of AAC, there have been three updates which have added the latest technological advancements while maintaining
full compatibility with the existing AAC format. These updates create increased efficiency, which means fewer bits have to be spent to achieve
the same excellent audio quality as before.
Evolution of AAC in a backward compatible manner: the original profile is part of all successors. In parallel a low delay line has been developed (image-source: Fraunhofer IIS)
