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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With the integration of MPEG Surround and HE-AAC Multi-Channel into Orban's products, Internet broadcasters and pure play music services will be able to clearly distinguish themselves from competitors by providing an immersive surround audio experience to consumers.
The technology also allows for loudness and dynamic range control for ATSC-M/H Mobile DTV transmissions using HE-AAC.
HE-AAC offers the flexibility to encode up to 48 audio channels in various configurations including mono, stereo, 5.
Installing this plug-in in digital audio workstation software such as Pro Tools, Audition, Acid, WaveLab, Logic, or Cubase will allow files to be saved in formats such as AAC, HE-AAC, mp3, or the lossless formats HD-AAC and mp3HD.
Licensees of Fraunhofer's HE-AAC decoder use test tool to verify outstanding audio quality
HE-AAC is the mandatory audio codec in DASH-AVC/264, the only native multichannel codec in Android and has been deployed in over 5 Billion CE devices.
It includes intelligent audio analysis and an automated loudness normalization engine, along with the ability to encode, decode, convert, or transcode between the following Dolby formats: Dolby Digital, Dolby Digital Plus, Dolby Pulse, and Dolby E bitstreams, as well as PCM, MPEG-1 LII, AAC, HE-AAC, and HE-AAC v2.
This includes audio codecs such as MPEG Layer-2 for DAB Classic or MPEG HE-AAC for DAB+, data applications such as Journaline, protocol stack implementations, transport protocols and conditional access solutions such as HECA.
Most codecs are pretty benign these days--AAC at 224Kbps compared to what we've been used to is pretty spectacular, and the HE-AAC data rate can be lower but still maintain the same quality," he says.
DENVER -- Fraunhofer IIS, a reliable supplier of ready-to-run-software with more than 20 years of experience in the development and implementation of MPEG audio codecs, announced today that they will introduce a broad range of MPEG audio codecs, such as MPEG-4 HE-AAC v2 and MPEG Surround, suitable for Android-based mobile phones at the 2010 Mobile World Congress (Barcelona, February, 15-18).
264 Baseline, Main and High Profile, MPEG-4 Simple Profile, AVS, VC-1 as well as AAC, HE-AAC.
Audio For Newsgathering: Working representatives from this elite, unique and occasionally dangerous branch of the audio world are encountering a constantly expanding universe of options for gathering and broadcasting news: From EV-DO to BGAN, AMR-WB to HE-AAC, CF to SDHC, this session will move beyond the acronyms to investigate current and emerging options for audio field recording and "backhaul.