For more than ten years, MPEG Advanced Audio Codec (AAC) has been the most important audio codec for state-of-the-art multimedia systems. During that time it had been continuously updated and is still the state-of-the-art audio codec today.
Thanks to its versatility, MPEG AAC is natively supported in every leading operating system (including Windows and OSX), media player and browser. Additionally, MPEG AAC is part of every mobile operating system (including Android and iOS), it is used for streaming audio to billions of devices and used for audio in all mobile TV standards around the globe. Also, the classic consumer electronics world relies heavily on AAC, as it is used in all tablets and game consoles, in most DTVs, Bluray players, STBs and music players and in most cars and digital radios. At the end of 2012, MPEG AAC has been licensed for more than eight billion devices worldwide, a number which is constantly growing.

The AAC codecs offer a balanced sound quality over a wide spectrum of bit rates: from highest audio quality at bit rates of 256 kbit/s, to good audio quality at bit rates as low as 16 kbit/s. At all bit rates AAC represents the state-of-the-art audio codec. This versatility allows for both, uncompromised high-end audio with 24 bit/96 KHz up to 24 bit/192 KHz as well as an impressive audio experience over channels with limited bandwidth, such as those in broadcast or mobile multimedia streaming.
AAC also offers special low-delay versions, which are used in Apple's Facetime and which are today's de facto audio standard for high-quality communication systems, such as video conferencing and telepresence.

On top of being a versatile, reliable audio codec, AAC offers all the features needed for delivery of stereo and surround content to any device: Loudness metadata, binaural headphone mode, adaptive streaming and many more. As an open ISO Standard, AAC offers a freedom unmatched by any closed eco system.

To help AAC decoder manufacturers with testing their implementation, this website offers test bitstreams that go beyond MPEG audio conformance. With those files manufacturers can make sure that their implementation works across all the different applications and ecosystems (digital TV, mobile and Internet streaming, digital radio, gaming etc.).
The test bitstreams, further informational material, and FAQ section will make it easy for companies to use MPEG AAC codecs.

The following companies endorse this web site's efforts to promote MPEG Audio technology: