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High-Efficiency Advanced Audio Coding
Audio codec / From Wikipedia, the free encyclopedia
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High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding format for lossy data compression of digital audio defined as an MPEG-4 Audio profile in ISO/IEC 14496–3. It is an extension of Low Complexity AAC (AAC-LC) optimized for low-bitrate applications such as streaming audio. The usage profile HE-AAC v1 uses spectral band replication (SBR) to enhance the modified discrete cosine transform (MDCT) compression efficiency in the frequency domain.[3] The usage profile HE-AAC v2 couples SBR with Parametric Stereo (PS) to further enhance the compression efficiency of stereo signals.
Filename extensions | MPEG/3GPP Container
Apple Container
ADTS Stream - NOT raw - Contains Headers
|
---|---|
Internet media type | audio/aac audio/aacp audio/3gpp audio/3gpp2 audio/mp4 |
Developed by | ISO |
Type of format | Audio compression format |
Contained by | MPEG-4 Part 14, 3GP and 3G2, ISO base media file format, Audio Data Interchange Format (ADIF), Audio Data Transport Stream (ADTS) |
Extended from | AAC |
Standard | ISO/IEC 14496-3 |
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/3/37/AAC_profiles.svg/320px-AAC_profiles.svg.png)
HE-AAC is used in digital radio standards like HD Radio,[4] DAB+ and Digital Radio Mondiale.