aacPlus


Also found in: Dictionary, Thesaurus, Medical, Legal, Financial.

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.
Mentioned in ?
References in periodicals archive ?
According to Coding Technologies aacPlus has been proven in several tests to offer the highest quality at lowest possible bit rates.
561 Dolby Digital Plus Encoder OEM Module with Dolby E, Dolby Digital, Dolby Digital Plus, and aacPlus by Dolby audio formats.
We've offered our customers stereo AAC-LC and aacPlus decoders for several years with great success in the handheld and portable device markets, and we're now seeing strong demand for multi-channel versions in home entertainment multimedia products," stated Larry Przywara, Tensilica's marketing director for mobile/multimedia products.
Supported audio packages include: Dolby[R] Digital AC-3 and Dolby Digital Plus, MP3, MPEG-2/4 AAC LC, MPEG-4 aacPlus V1 and V2, Ogg Vorbis, WMA, AMR, G.
Dolby also showed aacPlus, a high-quality, highly efficient audio compression format designed for download, streaming, and broadcast applications on mobile phones.
The demo supports MP3, AAC, aacPlus and WMA decode as well as SRS WOW-XT, X-Space 3D, AM3D stereo expansion and 3D effects.