"The MPEG-4 Low Delay Audio Coder (aka AAC Low Delay, or AAC-LD) is designed to combine the advantages of perceptual audio coding with the low delay necessary for two-way communication." This will be Greek to most people. If I knew what this sentence means, I probably would not need to refer to this Wikipedia article. While I can understand that knowledgeable people want to make sure that a Wikipedia article is impeccably technically correct, but there needs to be a better understanding that people come to Wikipedia for the sole and particular reason of enhancing the knowledge about a subject with which they are not necessarily completely familiar. Consequently, a substantial portion of an article like this needs to be devoted to making it accessible to those people who are moderately familiar with the subject matter, are willing to click on internal or external links for further information, but who are not experts in the field and probably do not have a working knowledge of phrases such as "perceptual audio coding" and this significance of "the low delay necessary for two-way communication."