Printer Friendly
Dictionary, Encyclopedia and Thesaurus - The Free Dictionary
1,749,781,836 visitors served.
forum mailing list For webmasters
?
New: Language forums
Dictionary/
thesaurus
Medical
dictionary
Legal
dictionary
Financial
dictionary
Acronyms
 
Idioms
Encyclopedia
Wikipedia
encyclopedia
?

AAC

   Also found in: Acronyms, Wikipedia 0.02 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


How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
?Page tools
Printer friendly
Cite / link
 Email
Feedback
? Mentioned in ? References in periodicals archive
 
A full chapter is devoted to the evaluation of a child for an AAC intervention and provides a very practical overview.
Meaningful Exchanges for People With Autism: An Introduction to ... by Lunnen, Karen Yundt / Physical Therapy
Nypro plans to merge AAC into its in-house automation group, and plans to divest AAC's Raptor line of injection molding robots by the end of the year.
Automated assemblies is up for sale by Plastics Technology
AAC & U has announced the appointment of Terrel (Terry) Rhodes as its new vice president for quality, curriculum, and assessment.
Terrel Rhodes appointed AAC & U vice president by Liberal Education
More results
 
Encyclopedia browser? ? Full browser
 
 
Encyclopedia
?

Disclaimer | Privacy policy | Feedback | Copyright © 2009 Farlex, Inc.
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Terms of Use.