From Sega Retro

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CRI ADX is an audio codec created by CRI Middleware, and was originally released in 1996.

CRI ADX is a multi-streaming system, providing audio compression features while minimising processor load. It was used in video games to deliver relatively high quality audio without the need to stream directly from a disc. It is a 4-bit ADPCM format and can store mono or stereo audio, and is capable of looping audio (or playing from any arbitrary point in the audio's data) without noticable stutters (as would be the case, for example, with Red Book audio streamed in real time from a disc).

Sega's close relationship with CRI meant that CRI ADX became a standard within the company for many years, debuting in around 1998 in Sega Saturn games and the vast majority of Sega Dreamcast ones. CRI ADX has also been used by Sega since becoming a third-party developer. CRI also combined the technology with MPEG streams to create the Sofdec movie codec.

Today the technology is obsolete, with CRI launching ADX2 as a successor in 2010.

Games which utilise CRI ADX



PlayStation 2

Nintendo GameCube




PlayStation 3


Xbox 360


Windows PC

Nintendo DS


PlayStation Portable