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AAC

   Also found in: Acronyms, Wikipedia 0.06 sec.

AAC

(Advanced Audio Coding) An audio compression technology that is part of the MPEG-2 and MPEG-4 standards. AAC, especially MPEG-4 AAC, provides greater compression and better sound quality than MP3, which also came out of the MPEG standard.

Popularized by the iPod
AAC is the default format for Apple's iPod. It was chosen because it added sound quality and also supported digital rights management (DRM), which is administered through Apple's iTunes jukebox software. AAC songs purchased from Apple's music store are copy protected (see formats below). With iTunes, users can also choose to rip their CDs to AAC instead of MP3.

Profiles
AAC is available in profiles, which determine how the algorithms work to encode the audio data. Main offers the highest quality. Low Complexity (LC) is lower quality, but uses less CPU processing. Scalable Sampling Rate (SSR) is a variation of LC. Long Term Prediction was added in MPEG-4 to improve the Main profile. See aacPlus, Apple Lossless, MP3 and iPod. Following are the file extensions used for AAC:

  AAC File
  Extension   Type of AAC File

        MP4   Standard MPEG-4 video & audio

        M4A   Unprotected AAC
        M4A   Apple Lossless

        M4P   Protected AAC
        M4B   Protected AAC audiobook

AAC - Advanced Audio Coding


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