(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:
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
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
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