Advanced Audio Coding

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Advanced Audio Coding

(audio)
(AAC) A successor to MP3, allowing lower bit rates and more stable quality.

See MPEG-2 AAC Low Profile and MPEG-4 AAC Main Profile.

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 improved sound quality and also supported copy protection, which was administered through Apple's iTunes software. AAC song files purchased from the iTunes online store were sold with copy protection, but Apple dropped it in 2009 (see FairPlay). With iTunes, users may 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
References in periodicals archive ?
This suite of technologies comes with support for advanced audio codecs, smart power amps and voice software tech.
The new PIC32 Bluetooth Audio Development Kit builds on Microchip's existing stack-integrated Bluetooth audio module with a new low-cost, agency-certified Bluetooth HCI transceiver module based on a standard radio, AVRCP and A2DP Bluetooth profiles tailored for the PIC32, as well as both standard and advanced audio CODECs such as SBC, C and MP3.
The BDP-N460 Blu-ray Disc/DVD/CD player delivers full HD 1080/60p and 24p True Cinema output, decodes the latest advanced audio codecs, and is BD-LIVE capable with a broadband internet connection and the purchase of external memory.
The model also is compatible with advanced audio codecs including 7.1 channel Dolby TrueHD, Dolby Digital Plus, DTS -HD Master Audio, and DTS-HD High Resolution Audio decoding and bit-stream output, as well as analog 7.1 channel output.

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