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Old 2005-06-04, 12:59 PM
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Join Date: Apr 2005
Lightbulb MiniDisc (Atrac) Spectral and Frequency analyses.

Here is some kind of version history of the Atrac codec used in MiniDisc devices.
(Which ATRAC chips are in which MD units? minidisk.org faq, version table)

ATRAC-Version (release year) - [bitrate] - {frequency response}
ATRAC1-version 1.0 (1992) - [292 kbit/s] - {15kHz}
ATRAC1-version 2 (1994) - [292 kbit/s] - {18kHz}
ATRAC1-version 3 (1995) - [292 kbit/s] - {18kHz}
ATRAC1-version 3.5 (1996) - [292 kbit/s] - {18kHz}
ATRAC1-version 4 (1996) - [292 kbit/s] - {20kHz}
ATRAC1-version 4.5 (MD-Decks; 1996) - [292 kbit/s] - {20kHz}
ATRAC3-version 1.0 (MDLP) (2000) - [132/105/66 kbit/s]
ATRAC1- DSP Type-R (2001) - [292 kbit/s] - {20kHz}
ATRAC1- DSP Type-S (2002) - [292 kbit/s]
ATRAC3plus (2003) - [256/64/48 kbit/s] - {20kHz/?/?}



Atrac3 (MD-LP)

I found the codec at minidisc.org. Samples also taken from there.

Quote:
Originally Posted by minidisc.org
...
Notes:
.snip.
2. This audio codec was assembled from publicly available bits on the Web and hence may not represent the ATRAC3 codec Sony currently supplies with their MDLP and MemoryStick audio devices. It is supplied for educational purposes only, please address all questions about commercial use and licensing of ATRAC3 to [email protected].
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Last edited by range_hood; 2006-04-20 at 06:18 AM.
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