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An enhanced AAC format from Coding Technologies (www.codingtechnologies.com) that extends Low Complexity AAC (AAC LC) to deliver near CD-quality sound in as little as 32 Kbps. Also known as "High Efficiency AAC" (HE-AAC).

Version 1 - AAC+ (HE-AAC v1)
Using Spectral Band Replication (SBR), AAC+ is a proprietary technique that halves the sampling rate but encodes the missing higher frequencies at a rate of 1.5 Kbps and stores them in the auxiliary data fields of the MPEG format. SBR is also used in the mp3PRO format (see mp3PRO).

Version 2 - eAAC+ (HE-AAC v2)
Used for stereo signals, eAAC+ supports Parametric Stereo (PS), which works similar to SBR. PS encodes the differences between left and right channels as a 3 Kbps data stream that it sends along with the monaural representation of the channels. See AAC and MP3.

Spectral Band Replication (SBR)
SBR encodes the high frequencies and stores them in the auxiliary data fields. The decoder restores the high frequencies from the SBR data.

Parametric Stereo (PS)
Parametric Stereo combines the left and right channels into a monaural signal and encodes the differences between channels as parametric data at a bit rate up to 3Kbps. The decoder turns the monaural stream back into stereo from the parametric data.
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Synopsys' entire family of DesignWare ARC audio codecs is optimized for performance and ease of integration into SoCs and is fully compliant to audio industry standards such as AMR-WB+, MPEG-4 aacPlus v2, FLAC, WMA 10 Pro, Dolby Digital Plus and DTS-HD Master Audio.
A8 seeks to accelerate its growth by profiting from Coding Technologies expertise as the key inventor of the 3GPP/3GPP2 audio compression standards aacPlus v1 and aacPlus v2.
aacPlus v2 adds Parametric Stereo (PS), which significantly increases the codec efficiency a second time for low-bit-rate stereo signals.
It provides music playback of MP3, WMA, AAC, aacPlus v2, Ogg Vorbis, and PCM WAV formats.
Seiko Epson Corporation ("Epson") announced today the demonstration of its latest audio decoder chip S1V30220 at the 3GSM World Congress in Barcelona, including MPEG-4 aacPlus v2 (Enhanced aacPlus) decoding, targeted for mobile phones and portable media players.
AMSTERDAM, Netherlands -- Coding Technologies, the leading provider of audio compression for digital broadcasting, mobile music and the Internet, announced today that 4i2i Communications has licensed the company's MPEG-4 aacPlus v2 audio codec to be combined with 4i2i's highly optimized MPEG-4 AVC/H.
aacPlus v2 decoder: implements MPEG-4 aacPlus v2 decoding compliant with ISO/IEC 14496-3 and the 3GPP specification for Enhanced aacPlus, supporting AAC, PS (Parametric Stereo), and SBR (Spectral Band Replication) in mono, stereo and multichannel configurations.
With the addition of Parametric Stereo, aacPlus v2 raises the bar as the state-of-the-art low bit rate open- standards audio codec.
In order to ensure maximum user experience and quality, Telefonica Moviles Espana has initiated talks with Coding Technologies, the key inventor of the 3GPP/3GPP2 standards of aacPlus v1 and aacPlus v2.
MPEG-4 aacPlus v2 decoder: implements aacPlus v2 decoding which includes support for Parametric Stereo (PS) and SBR and is compliant with the 3GPP specifications for Enhanced aacPlus.