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How to determine the encoding of this dd image?

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Top Forums UNIX for Advanced & Expert Users How to determine the encoding of this dd image?
# 22  
Old 07-28-2014
Well I didn't get noise? A-law seems to work? Smilie

Why don't you have the logger anymore? Did it blow up?
# 23  
Old 07-28-2014
I am extremely sorry mate.

I uploaded the wrong file

https://www.dropbox.com/s/1l041xgxb1yucd9/input

I am really sorry indeed
Last edited by NICEPeppino; 07-28-2014 at 01:37 PM..
# 24  
Old 07-28-2014
I suspect it's still compressed or encoded in some way. Also, because of the fixed-size chunks you're getting, you're probably getting the stream somewhere in the middle, stripped of headers and the like.

Why don't you have the logger anymore? Did it blow up?

Can't you at least tell us what it was?
# 25  
Old 07-28-2014
The audio data come from tapes (DDS)

Yes you are right there are many of these block and their size is fixed at 524288 bytes

I do not get how the audio data should be decrypted each this data chunk but each of this as a metadata associated which is pretty much like this:

Code:
            84  20070306 16290454 20070306 16451529 2211 1 538            
            20070306 16290454 16842803 33 50354972            
            20070306 16301417 16908339 10 23341            
            20070306 16303670 16973843 262 23347            
            20070306 16393533 33816627 1 23478            
            20070306 16394148 50724883 3 23480            
            20070306 16395377 118030355 1 23483            
            20070306 16401015 907018259 1 23487            
            20070306 16420278 38142003 1 23514            
            20070306 16420892 21495827 1 23516            
            20070306 16421302 55115795 1 23517            
            20070306 16422121 21757971 1 23519            
            20070306 16422530 21823507 1 23520            
            20070306 16422940 55443475 4 23521            
            20070306 16424374 290521139 1 23524            
            20070306 16432060 39977011 1 23533            
            20070306 16432674 23330835 1 23535            
            20070306 16433084 56950803 1 23536            
            20070306 16433903 90701843 1 23538            
            20070306 16435132 40697875 4 23541            
            20070306 16440361 107937811 2 23544            
            20070306 16441999 24444947 2 23548            
            20070306 16442614 24510515 1 23549            
            20070306 16443023 41353267 8 23550            
            20070306 16445071 58261555 1 23555            
            20070306 16445891 58458163 2 23557            
            20070306 16450914 41877523 1 23560

Any idea on how to process each chunk based on this metadata?
Each block has its metadata which looks like the one pasted above

The first number is the channel and each following data chunk which has the same channel number needs to be concatenated with the previous one.
Last edited by NICEPeppino; 07-30-2014 at 08:02 AM..
# 26  
Old 07-28-2014
Why don't you have the logger anymore? Did it blow up?

Can't you at least tell us what it was?

Please do not ignore these questions a third time.

My suggestion would be to organize them by channel, and concatenate them together, and see if the data makes any more sense in context.
# 27  
Old 07-28-2014
The logger was sold years ago and I just joined the company. I was asked to extract the data from these tapes

The logger I was told was a normal computer with two tape drivers.
I cannot tell more about it because I do not know anything about it

I am trying to figure out how I can create a program which retrieve again the audio data inside these tapes

I have already concatenated all audio chunks by channel but at the end I couldn't hear anything from the generated files

I believe there is some data manipulation that needs to be done before playing it

You were talking about stream and fixed data chunks. Can you please tell me where I can read more about these topics and in particular about tape data structure. Why tapes are divided in blocks? and why there is a metadata for each block?

Thanks
Last edited by NICEPeppino; 07-29-2014 at 05:04 AM..
# 28  
Old 07-29-2014
You can store data on tape any way you please. They stored it this way probably for convenience.

Compare the streams and see if they have anything in common. Do they always begin with the same sequence of bytes? Do they share some common sequences?
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