ATRAC: Difference between revisions
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'''ATRAC''' ( | '''ATRAC''' ('''<u>A</u>daptive <u>Tr</u>ansform <u>A</u>coustic <u>C</u>oding''') is a proprietary audio compression technology developed by Sony for usage in their [[MiniDisc]] line of [[:Category:Digital Audio Players|digital audio players]]. | ||
It actually relates to three different audio compression technologies related among themselves, but with incompatibilities. It uses quadrature mirror filters and modified discrete cosine transform to represent encoded audio. | It actually relates to three different audio compression technologies related among themselves, but with incompatibilities. It uses quadrature mirror filters and modified discrete cosine transform to represent encoded audio. | ||
==ATRAC== | ==ATRAC== | ||
ATRAC (also called ATRAC1) was developed in 1991, and used in the first MiniDisc players in the early nineties. It used bitrates of 292kbps for stereo audio and | ATRAC (also called ATRAC1) was developed in 1991, and used in the first MiniDisc players in the early nineties. It used bitrates of 292kbps for stereo audio and 146kbps for mono. Several subversions were released, from 1 to 4.5, and all of them are backwards- and forwards-compatible. It's reported that it only started sounding good after version 3. | ||
==ATRAC3== | ==ATRAC3== | ||
ATRAC3 was released by Sony in 2000. It offers much better performance than ATRAC1, with reasonable quality at 132kbps. It's not backwards compatible with ATRAC1. | ATRAC3 was released by Sony in 2000. It offers much better performance than ATRAC1, with reasonable quality at 132kbps. It's not backwards-compatible with ATRAC1. | ||
ATRAC3 was used as default audio codec for mid-high bitrates in | ATRAC3 was used as default audio codec for mid-high bitrates in [[RealAudio]] 8. Since RealAudio 10, the default codec is [[AAC]]. It was also used at the now-defunct<ref>[https://web.archive.org/web/20110503185734/http://musicstore.connect.com/ CONNECT Music Store] via archive.org</ref> Sony Connect Music Store. | ||
==ATRAC3plus== | ==ATRAC3plus== | ||
In 2003, Sony released ATRAC3plus, the third backwards-incompatible revision of their codec. They promise to deliver transparency at 48kbps with this new codec (of course, that's an absurd claim). | In 2003, Sony released ATRAC3plus, the third backwards-incompatible revision of their codec. They promise to deliver transparency at 48kbps with this new codec (of course, that's an absurd claim). | ||
==References== | |||
<references/> | |||
==External links== | ==External links== | ||
*{{wikipedia|Adaptive Transform Acoustic Coding|ATRAC}} | |||
*[http://www.sony.net/Products/ATRAC3/ ATRAC3] official website at Sony.net | *[http://www.sony.net/Products/ATRAC3/ ATRAC3] official website at Sony.net | ||
*[http://www.minidisc.org/ Minidisc.org] - Resources and forums about MiniDisc and ATRAC | *[http://www.minidisc.org/ Minidisc.org] - Resources and forums about MiniDisc and ATRAC | ||
*<s> rjamorim conduced a listening test</s> featuring ATRAC3 at 132kbps. | *<s> rjamorim conduced a listening test</s> featuring ATRAC3 at 132kbps. | ||
[[Category:Audio codecs]] | |||
[[Category: | |||
Revision as of 18:22, 10 July 2019
ATRAC (Adaptive Transform Acoustic Coding) is a proprietary audio compression technology developed by Sony for usage in their MiniDisc line of digital audio players.
It actually relates to three different audio compression technologies related among themselves, but with incompatibilities. It uses quadrature mirror filters and modified discrete cosine transform to represent encoded audio.
ATRAC
ATRAC (also called ATRAC1) was developed in 1991, and used in the first MiniDisc players in the early nineties. It used bitrates of 292kbps for stereo audio and 146kbps for mono. Several subversions were released, from 1 to 4.5, and all of them are backwards- and forwards-compatible. It's reported that it only started sounding good after version 3.
ATRAC3
ATRAC3 was released by Sony in 2000. It offers much better performance than ATRAC1, with reasonable quality at 132kbps. It's not backwards-compatible with ATRAC1.
ATRAC3 was used as default audio codec for mid-high bitrates in RealAudio 8. Since RealAudio 10, the default codec is AAC. It was also used at the now-defunct[1] Sony Connect Music Store.
ATRAC3plus
In 2003, Sony released ATRAC3plus, the third backwards-incompatible revision of their codec. They promise to deliver transparency at 48kbps with this new codec (of course, that's an absurd claim).
References
- ↑ CONNECT Music Store via archive.org
External links
- ATRAC on Wikipedia
- ATRAC3 official website at Sony.net
- Minidisc.org - Resources and forums about MiniDisc and ATRAC
rjamorim conduced a listening testfeaturing ATRAC3 at 132kbps.