ac3 Files with the .ac3 filename extension refer to the proprietary audio file format Dolby digital AC-3, developed by Dolby Laboratories. The AC-3 format is from the lossy family of audio compression formats. It supports a variety of audio channel configurations and was the first of its kind to support the full surround sound experience. Because of this, the format has been commonly used in the development of motion picture features designed for theaters and in consumer homes through DVDs and surround sound home theater systems. The AC-3 format is one of the supported audio codecs of the ATSC standard ' a set of standards developed for digital television transmission in several affiliated countries.
aac The advanced audio coding audio format or AAC format for short is a standardized audio encoding format designed to succeed the popularized mp3 format. It is the result of the collaborative efforts of several companies including bell labs, Nokia, and Sony among others. It was initially released in 1997 as part of the lossy digital audio compression family of audio encoding formats. AAC enjoys a wealth of native compatibility and support by different platforms, hardware, and software applications including video game consoles such as the PlayStation 3, Nintendo DSi, and platforms such as Android, and YouTube. Today even diverse hardware such as in dash car audio players have native support for the format.