aacPlus

(redirected from HE-AAC)
Also found in: Acronyms, Wikipedia.

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.
Mentioned in ?
References in periodicals archive ?
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 HE-AAC codec supports multi-channel broadcasting in excellent quality at only 160 kbit/s, which is less than half the bitrate of other surround codecs.
The technology also allows for loudness and dynamic range control for ATSC-M/H Mobile DTV transmissions using HE-AAC.
For example, the use of HE-AAC for podcasts could save 2/3 of a station's download bandwidth costs.
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/AVC, VC-1, DV, DVCPRO 25/50/HD, JPEG2000, AAC, HE-AAC and Dolby(R) Digital, MainConcept is headquartered in Germany with subsidiaries in the USA, Russia, and Japan.
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.
The subsystem supports popular audio formats used in DVD, Digital Video Broadcast and IPTV such as MPEG Layer 2, AAC and HE-AAC formats and also includes support for post processing and stream data handling to improve the listening experience of the end-user.
264/AVC, VC-1, DV, DVCPRO, DVCPRO HD, JPEG2000, AAC, HE-AAC and AC3.
MPEG-4 HE-AAC audio coding technology licensed by Fraunhofer IIS.