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 Forum index » Archive » Archive: General » Old News & Rumors
[Trailhead?] Phonopath
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hagbard celine
Boot

Joined: 07 Nov 2006
Posts: 46
Location: minneapolis

 		Just an update of 7-1

Spoiler (Rollover to View):

The braille from the sound file


decode 6461746148854900 from hexadecimal:
dataH…I;
or
dataH.I

open the dots3456.wav in a hex editor and notice the data tag at the top. Change it to dataH...I; or dataH.I save as a new file and the 2nd part of the puzzel opens up





PostPosted: Tue Jan 10, 2012 10:10 pm
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MrToasty
I Have 100 Cats and Smell of Wee


Joined: 03 Aug 2004
Posts: 4310
Location: Des Moines, IA

 		Speeding up the new audio you can hear what sounds like 4 letters.

PostPosted: Tue Jan 10, 2012 10:41 pm
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MrToasty
I Have 100 Cats and Smell of Wee


Joined: 03 Aug 2004
Posts: 4310
Location: Des Moines, IA

 		OK, so starting from where hagbard, Gazongola et al in IRC left off...
Spoiler (Rollover to View):
Looking at the melody in the second part of the audio, the others figured out that it was a braille encoding. There are 6 unique tones, so converting to numbers similar to before (and noting the spaces and larger gaps) gives:

1345 2456 125 15 1235 15
1235 24 234
1356 134 13456
134 12 1235 135 2345 125 15 1235 236

Each number describes a braille character, so translating again gives:

nwhere
ris
zmy
mbrother?

NRZM may refer to an encoding scheme:
http://en.wikipedia.org/wiki/Non-return-to-zero
???

So, where to go from here?

PostPosted: Wed Jan 11, 2012 3:25 am
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JoeyJo0
Boot

Joined: 07 Jan 2012
Posts: 19
Spoiler (Rollover to View):
NRZ-M is used in digital signals.

This doesn't look like a digital signal.

"NRZ-M [Non-Return-to-Zero-Mark (NRZ-M) Encoding]: The polarity of the signal changes when the incoming signal is a one. An incoming zero would not change the polarity of the signal."


PostPosted: Wed Jan 11, 2012 6:02 am
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GuestUser17
Entrenched


Joined: 22 Feb 2011
Posts: 812

 		A nice free tool - Sonic Viusalizer
So I was looking at the modified dots3456.wav file in Sonic Visualizer and noticed an easier way to spot the patterns and also to identify the notes being played so we don't need to depend on someone with a guitar note detector.

What I did was to go to Layer / Add Peak Frequency Spectrogram which will give you the picture below. If you look at the top right you will see the information about where the mouse is hovering (the small white square towards the top left - 3rd note of the harmony). The information includes the note of the peak pitch - F#4 in this case. It's easy to see the 1,2,3,4,5,6 patterns from that spectrogram too.

I'm not sure if any of the other frequency bands that show there would help with the next step but I liked this view of the data.
Screen shot 2012-01-11 at 8.08.21 AM.png
 Description   
 Filesize   230.76KB
    121 Time(s)

Unfortunately, this file is no longer in our archives.

PostPosted: Wed Jan 11, 2012 9:25 am
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hagbard celine
Boot

Joined: 07 Nov 2006
Posts: 46
Location: minneapolis

 		So NRZ is used to encode binary at the very bottom of the audio spectrum, down to 0 HZ.

I isolated everything below 30hz



There is certainly something there but you couldn't hear it. So I pitch shifted up 72 steps:



You can hear the results here:
http://www.megaupload.com/?d=Y8GTM4KN

not sure if it means anything...

EDIT to add GuestUser17 pointed out:
"I don't believe NRZM is just for low frequencies though. I've seen it on 9600 baud connections which would be higher than 30Hz."

PostPosted: Wed Jan 11, 2012 11:49 am
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hagbard celine
Boot

Joined: 07 Nov 2006
Posts: 46
Location: minneapolis

PostPosted: Wed Jan 11, 2012 5:29 pm
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Tharol
I Have 100 Cats and Smell of Wee

Joined: 02 Oct 2011
Posts: 4805
Location: Muncie, Indiana

 		Person there on 7-1 so hard figure think.

PostPosted: Wed Jan 11, 2012 7:24 pm
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hagbard celine
Boot

Joined: 07 Nov 2006
Posts: 46
Location: minneapolis

 		7-1 part 2 solution

Spoiler (Rollover to View):
the brother of dots3456.wav is helloplayer.wav they are both 4,819,392 bytes.

edit the data tag to match dots3456.wav and enjoy 7-1 part 3!


PostPosted: Wed Jan 11, 2012 8:47 pm
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GuestUser17
Entrenched


Joined: 22 Feb 2011
Posts: 812

 		7-1 part 2 modified wave file
Here is a link to the modified file:
http://filesmelt.com/dl/hello_player2.wav

PostPosted: Wed Jan 11, 2012 9:02 pm
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GuestUser17
Entrenched


Joined: 22 Feb 2011
Posts: 812

 		7-1 SOLVED
GuestUser17 wrote:
Here is a link to the modified file:
http://filesmelt.com/dl/hello_player2.wav

Spoiler (Rollover to View):
You need to go to the area at the end of this file after the girl speaks and look at the waveform. You will see it takes the form of a digital square signal. Decoding using NRZ-M gives you 10101001100 1111 1 1111011 10000111 100100101001. Convert that to decimal gives you 1356 15 1 123 135 2345. Use that for dots in braille and you get ZEALOT.


PostPosted: Wed Jan 11, 2012 9:57 pm
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GuestUser17
Entrenched


Joined: 22 Feb 2011
Posts: 812

 		DON'T ANSWER 7-2
It's a trick question. Look at the file in sonic visualizer first. Not sure what the right answer is but the wrong one is:
Spoiler (Rollover to View):
FREEFALL


PostPosted: Wed Jan 11, 2012 10:06 pm
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Tseug
Boot

Joined: 15 Mar 2011
Posts: 52

 		the achievement is still needed, so I think it's safe to answer

edit: since it seems this is going to require pretty much everything from the other levels I jumped ahead to the hex edit of data which added a quick click to the end of the file. I slowed it down quite a bit and hear some high pitched tones in a sequence though not sure if that is part of the puzzle or just a side effect of changing something that didn't need to be

PostPosted: Wed Jan 11, 2012 10:08 pm
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hagbard celine
Boot

Joined: 07 Nov 2006
Posts: 46
Location: minneapolis
Tseug wrote:
I jumped ahead to the hex edit of data which added a quick click to the end of the file.


Would you mind how you did this (what you added) and what this technique allows you to do?

Thanks!

PostPosted: Wed Jan 11, 2012 10:24 pm
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Tseug
Boot

Joined: 15 Mar 2011
Posts: 52

 		I just used a freeware hex editor to change the data.t" to dataH.I as in 7-1 to see if it would modify the file in a similar fashion. Ended up with a very quick click and figured it might have something. Slowed it down 99% twice I believe. Ended up with the tones and some nice waves to look at but I stopped being able to solve the puzzles quite a few levels ago so I can't contribute much further than that.

not sure if it matters but close to the end of the file if read in wordpad or hexeditor says
Spoiler (Rollover to View):
BULLSHIT
which may be referring to the incorrect password

PostPosted: Wed Jan 11, 2012 10:31 pm
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