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.
caf A .caf extension file is a Coral Audio Format file. This format is quite advanced as compared to older formats of digital audio like .wav and .aiff. The .caf format files are of a very high resolution in terms of recording and editing as well as playback. They offer features like unlimited file size, excellent recording, multiple data formats, auxiliary data and data dependency support.