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What is the full form of AAC?

Full form of AAC: Here, we are going to learn what does AAC stands for? AAC – which is an abbreviation of "Advanced Audio Coding" in Computer Acronyms/Abbreviations, etc. By Anushree Goswami Last updated : March 30, 2024

AAC: Advanced Audio Coding

AAC is an abbreviation of "Advanced Audio Coding".

It is an audio coding standard for lossy digital audio compression. It is created to be the descendant of the MP3 format; AAC usually accomplishes higher sound quality than MP3 at the same bit rate.

Implemented and developed technical standards by ISO and IEC of AAC, as a segment of the MPEG-2 and MPEG-4 specifications. The segment of AAC, HE-AAC ("AAC+"), is segment of MPEG-4 Audio and also taken on into digital radio standards DAB+ and Digital Radio Mondiale, in addition to mobile television standards DVB-H and ATSC-M/H.
AAC is the conventional or standard audio format for:

• iPhone, iPod, iPad, iTunes, DivX Plus Web Player, PlayStation 3 and a variety of Nokia Series 40 phones.
• It is supported on PlayStation Vita, Wii (with the Photo Channel 1.1 update set up), Sony Walkman MP3 series and afterward, Android and BlackBerry.
• AAC is also supported by producers or makers of in-dash car audio systems.

Other Portable Players for AAC

• Archos
• Cowon (without authorization supported on a number of models)
• Creative Zen Portable
• Nintendo 3DS
• Nintendo DSi
• Philips GoGear Muse
• PlayStation Portable (PSP) with firmware 2.0 or greater
• Samsung YEPP
• SanDisk Sansa (a number of models)
• Walkman
• Zune
• Any portable player that completely supports the Rockbox third party firmware

Extensions and Enhancements of AAC

A variety of extensions have been supplemented to the first AAC standard (described in MPEG-2 Segment 7 in 1997):

• Perceptual Noise Substitution (PNS): In 1999, it was supplemented in MPEG-4. It enables the coding of noise as pseudorandom data.
• Long Term Predictor (LTP): In 1999, it was supplemented in MPEG-4. It is an advance predictor with minor computational complexity.
• Error Resilience (ER): In 2000, it was supplemented in MPEG-4 Audio version 2, used for transport above error susceptible channels.
• AAC-LD (Low Delay): Described in 2000, used for real-time conversation applications.
• High-Efficiency AAC (HE-AAC): Described in 2003, it is also known as aacPlus v1 or AAC+, the arrangement of SBR (Spectral Band Replication) and AAC-LC. Used for small bitrates.
• HE-AAC v2: Described in 2004 and 2006, it is also known as aacPlus v2 or eAAC+, the arrangement of Parametric Stereo (PS) and HE-AAC; used for even minor bitrates.
• MPEG-4 Scalable to Lossless (SLS): Described in 2006, can add-on an AAC stream to make available a lossless decoding alternative, such as in Fraunhofer IIS's "HD-AAC" product.

Reference: Advanced_Audio_Coding