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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SBR(TM) (Spectral Band Replication) from Coding Technologies is a backward and forward compatible method to enhance the efficiency of any audio codec; putting the "PRO" in mp3PRO and the "Plus" in aacPlus.
Epson's S1V30220 is a straightforward and trend-setting solution to quickly and easily bring aacPlus v2 into affordable end products," says Stefan Meltzer, Vice President Business Development Coding Technologies.
NUREMBERG, Germany -- Coding Technologies, the leading provider of audio compression for digital broadcasting, mobile media, and the Internet, today announced that the EBU (European Broadcasting Union) has chosen its MPEG-4 aacPlus audio codec as a clear winner in a recent multi-channel audio test.
In the latest EBU (European Broadcasting Union) test of audio compression formats, aacPlus outperformed all other audio codecs in the test field in terms of efficiency while scoring overall audio quality results in the excellent range.
Dolby Digital Plus and aacPlus are audio coding standards that reduce the bit rate requirements for delivering high-quality audio streams to subscribers.
It provides music playback of MP3, WMA, AAC, aacPlus v2, Ogg Vorbis, and PCM WAV formats.
These features also support technologies such as MPEG-1 Audio Layer 3 (MP3), Windows Media Audio (WMA), Advanced Audio Coding (AAC), aacPlus and Enhanced aacPlus audio formats.
Certain statements in this press release, including statements regarding the performance and capabilities of the aacPlus by Dolby, Dolby Media Meter, Dolby LM100 Broadcast Loudness Meter, Dolby DP600 Program Optimizer, the Cat.
Immediately available, SPIRIT audio software packages include: AAC-LC decode and encode, aacPlus v1 and v2 decode and encode, BSAC decode, MP3 decode and encode, Ogg Vorbis decode, and WMA decode and encode.
WORLDSPACE plans to use the most advanced digital audio technology available today (MPEG-4 aacPLUS v.