aacPlus

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aacPlus

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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StreamAudio's "Multi-Format Streaming" option will give radio stations the ability to stream in the world's standard format, MP3; as well as simultaneously providing streams in Windows Media, AAC, AAC Plus, and OGG.
1 introduces AAC Plus Audio, an audio compression feature providing the same audio fidelity as the AAC standard while compressing audio file sizes to half its original, uncompressed size.
We are excited to build upon the success of Sorenson Squeeze with the Windows Media encoding plug-in option for Mac users and AAC Plus Audio for our entire Windows(R) and Macintosh Sorenson Squeeze lineup," said Matt Cupal, vice president of strategy and business development at Sorenson Media.