aacPlus


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aacPlus

An enhanced AAC audio format from Dolby Laboratories that delivers near CD-quality sound in as little as 32 Kbps. aacPlus extends Low Complexity AAC (AAC LC). Also known as "High Efficiency AAC" (HE-AAC), aacPlus was originally developed by Stockholm-based Coding Technologies, which Dolby acquired in 2007. See AAC and MP3.


HE-AAC version 1 - AAC+
HE-AAC v1 (AAC+) uses Coding Technologies' Spectral Band Replication (SBR) to cut the sampling rate in half. SBR then encodes the missing high frequencies at 1.5 Kbps and stores them in the auxiliary data fields. The decoder restores the high frequencies from the SBR data. See mp3PRO.







HE-AAC version 2 - Enhanced AAC+ (eAAC+)
HE-AAC v2 (eAAC+) uses Parametric Stereo (PS), which combines the left and right channels into a monaural signal. PS encodes the differences between channels as parametric data at 3 Kbps, which is used to decode the monaural stream back into stereo.
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References in periodicals archive ?
An aacPlus audio codec from Coding Technologies, an audio compression technologies provider, is reportedly to be used in Norwegian telecomms group Telenor ASA's mobile music download service.
By adding 4i2i and TIVR to the ZSP Solution Partner Program, consumer electronic SoC designers will have access to a comprehensive set of audio technologies (aacPlus, WMA, MP3, etc.) as well as the latest video compression standards (H.263, H.264, MP EG-4, etc.) required by a number of emerging multimedia applications.
TELECOMWORLDWIRE-13 July 2005-Telenor uses aacPlus audio codec for mobile music service(C)1994-2005 M2 COMMUNICATIONS LTD http://www.m2.com