High-Efficiency Advanced Audio Coding
| 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 |
High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding format for lossy data compression of digital audio as part of the MPEG-4 standards. 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. The usage profile HE-AAC v2 couples SBR with Parametric Stereo (PS) to further enhance the compression efficiency of stereo signals.
HE-AAC is defined as an MPEG-4 Audio profile in ISO/IEC 14496–3. HE-AAC is used in digital radio standards like HD Radio, DAB+ and Digital Radio Mondiale.