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Lossy or Lossless? Please use this forum to post spectral and frequency analysis posts about shows you have your doubts about.

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  #1  
Old 2005-06-04, 01:59 PM
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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 .
Attached Images
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Last edited by range_hood; 2006-04-20 at 07:18 AM.
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  #2  
Old 2005-06-07, 11:49 AM
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Frequency Analysis

right channel only.
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  #3  
Old 2005-07-07, 04:58 AM
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DSP Type-R SP
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  #4  
Old 2005-07-07, 05:05 AM
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ATRAC3plus Hi-SP (256kbit/s)
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  #5  
Old 2005-07-26, 07:19 AM
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Atrac1 version 4 (Sony MZ-R55)
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  #6  
Old 2011-03-29, 11:50 AM
JeanineMcphillips JeanineMcphillips is offline
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Re: MiniDisc (Atrac) Spectral and Frequency analyses.

Hi

Nice work and thanks for providing history of version of the Atrac codec.
Its really helpful
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  #7  
Old 2013-01-03, 11:39 AM
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Re: MiniDisc (Atrac) Spectral and Frequency analyses.

What about Hi-MD Minidisc Masters???
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  #8  
Old 2013-01-04, 10:26 AM
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Re: MiniDisc (Atrac) Spectral and Frequency analyses.

Quote:
Originally Posted by Lucifer burns View Post
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.
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  #9  
Old 2013-01-06, 09:24 PM
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Re: MiniDisc (Atrac) Spectral and Frequency analyses.

^ sure that would be awesome!!
send me over your e-mail address in a PM.
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  #10  
Old 2013-01-09, 05:26 PM
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Re: MiniDisc (Atrac) Spectral and Frequency analyses.

Quote:
Originally Posted by Lucifer burns View Post
^ 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.
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  #11  
Old 2013-06-19, 02:00 AM
jacksmith jacksmith is offline
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Re: MiniDisc (Atrac) Spectral and Frequency analyses.

Thanks for sharing information and images,your information and images increasing my knowledge.
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  #12  
Old 2013-06-19, 01:47 PM
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Re: MiniDisc (Atrac) Spectral and Frequency analyses.

please post spectral analysis in color.
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  #13  
Old 2014-02-19, 09:51 AM
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Re: MiniDisc (Atrac) Spectral and Frequency analyses.

Re:
Quote:
Originally Posted by Drgiggles1 View Post
Need opinions if these are LPCM mode mini disc recordings. I believe them to be LPCM and not ATRAC.
Quote:
Originally Posted by jameskg View Post
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.
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