1. 
   AAC-LD
   The MPEG-4 Low Delay Audio Coder (aka AAC Low Delay, or AAC-LD) is audio compression format designed to combine the advantages of perceptual audio coding with the low delay necessary for two-way communication. It is closely derived from the MPEG-2 Advanced Audio Coding (AAC) format. It was publishe...
   Found op http://en.wikipedia.org/wiki/AAC-LD
   
   

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