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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According to Coding Technologies aacPlus has been proven in several tests to offer the highest quality at lowest possible bit rates.
Telenor uses aacPlus audio codec for mobile music service
561 Dolby Digital Plus Encoder OEM Module with Dolby E, Dolby Digital, Dolby Digital Plus, and aacPlus by Dolby audio formats.
Dolby Showcases Solutions for Digital Transition and Beyond
264, MPEG-4, and WMV and audio middleware supporting aacPlus (Advanced Audio Coding Plus).
Renesas Technology Announces SH-MobileR2, Multimedia Host Processor With Integrated H.264/MPEG-4 Video Engine for Next Generation Multimedia Applications
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.
Tensilica Becomes First Processor IP Company to Support MPEG-4 AAC-LC and aacPlus Multi-Channel Decoders for 7.1 Surround Sound
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.
Samsung Signs Multi-Year License for Tensilica Diamond Standard 330HiFi Audio DSP
Dolby also showed aacPlus, a high-quality, highly efficient audio compression format designed for download, streaming, and broadcast applications on mobile phones.
Dolby Unleashes the Potential of Mobile Entertainment at Mobile World Congress
The demo supports MP3, AAC, aacPlus and WMA decode as well as SRS WOW-XT, X-Space 3D, AM3D stereo expansion and 3D effects.
Large Numbers of Tensilica-based Cell Phones on Display at Mobile World Congress 2008 in Barcelona

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