MiniDisc (Atrac) Spectral and Frequency analyses.

[range_hood]

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.

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].

[range_hood]

right channel only.

[range_hood]

DSP Type-R SP

[range_hood]

ATRAC3plus Hi-SP (256kbit/s)

[range_hood]

Atrac1 version 4 (Sony MZ-R55)

[JeanineMcphillips]

Hi

Nice work and thanks for providing history of version of the Atrac codec.
Its really helpful

[Lucifer burns]

What about Hi-MD Minidisc Masters???

[Drgiggles1]

Originally Posted by Lucifer burns

What about Hi-MD Minidisc Masters???

If you send me one wav file via a free file sharing site I'll take a look at the spectral and give you my thoughts. Shit, i'll even post it up on the forum for mods to chime in.

[Lucifer burns]

^ sure that would be awesome!!
send me over your e-mail address in a PM.

[Drgiggles1]

Originally Posted by Lucifer burns

^ sure that would be awesome!!
send me over your e-mail address in a PM.

Here are 5 flacs that Lucifer burns sent to me that were converted to WAV without error and zoomed in on 2 seconds. FA's and SA's analyzed with CEP in black and white.






Need opinions if these are LPCM mode mini disc recordings. I believe them to be LPCM and not ATRAC.

[jacksmith]

Thanks for sharing information and images,your information and images increasing my knowledge.

[paddington]

please post spectral analysis in color.

[range_hood]

Re:

Originally Posted by Drgiggles1

Need opinions if these are LPCM mode mini disc recordings. I believe them to be LPCM and not ATRAC.

Originally Posted by jameskg

please post spectral analysis in color.

and maybe a 10 seconds snippet in flac format.
... plus the known lineage, concert date (artist).

There seem to be digital artifacts in there.

[Lucifer burns]

It's a shame this continues to keep me from uploading ANY Hi-MD Minidisc Master recordings here.

But i constantly see "officially" released material shared here and NOT Banned !!!

[dorrcoq]

Originally Posted by Lucifer burns

It's a shame this continues to keep me from uploading ANY Hi-MD Minidisc Master recordings here.

But i constantly see "officially" released material shared here and NOT Banned !!!

"this restriction does not affect shows taped to Hi-MD using the uncompressed wav format"

So...what's your problem?