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>> That's interesting. How did you generate that? The only thing I managed
>> to do was a FFT (attached).
I just dumped it into a sound editor... nothing fancy.
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47cab446@news.povray.org...
> Hi,
>
> ok, this is reaaaallly off-topic, but I thought I'd ask anyway. Does
> anybody have a clue what this signal might be?
> http://www.kalchreuter.de/geocaching/asd.wav
>
> It is a riddle for a geocache (here:
> http://www.geocaching.com/seek/cache_details.aspx?wp=GC18WAP), and I'm out
> of ideas. The page says that the signal is used for purposes other than
> intended, in this case there should be geo-coordinates in it somehow.
>
> I'm thankful for any pointers.
>
> Manuel
Isn't it a radio beacon signal?
Marc
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> ok, this is reaaaallly off-topic, but I thought I'd ask anyway. Does
> anybody have a clue what this signal might be?
> http://www.kalchreuter.de/geocaching/asd.wav
>
> It is a riddle for a geocache (here:
> http://www.geocaching.com/seek/cache_details.aspx?wp=GC18WAP), and I'm out
> of ideas. The page says that the signal is used for purposes other than
> intended, in this case there should be geo-coordinates in it somehow.
Do you have any information on which region of the world it is likely to be
in?
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scott schrieb:
>> ok, this is reaaaallly off-topic, but I thought I'd ask anyway. Does
>> anybody have a clue what this signal might be?
>> http://www.kalchreuter.de/geocaching/asd.wav
>>
>> It is a riddle for a geocache (here:
>> http://www.geocaching.com/seek/cache_details.aspx?wp=GC18WAP), and I'm
>> out of ideas. The page says that the signal is used for purposes other
>> than intended, in this case there should be geo-coordinates in it
>> somehow.
>
> Do you have any information on which region of the world it is likely to
> be in?
Yes, sorry. Were looking for coordinates in the form
Wiesbaden in Germany.
Manuel
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Tim Attwood schrieb:
>>> That's interesting. How did you generate that? The only thing I managed
>>> to do was a FFT (attached).
>
> I just dumped it into a sound editor... nothing fancy.
Well, then I guess your editor might be confused by the low samplerate?
Because one of our editors has to be wrong.
Manuel
Post a reply to this message
Attachments:
Download 'geo_sound.jpg' (56 KB)
Preview of image 'geo_sound.jpg'
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M_a_r_c schrieb:
> Isn't it a radio beacon signal?
Don't they use morse code to transmit data? I guess the real question
might not be, what signal it is, but what code is used to encode the
data here. If it were morse code or simple FSK modulation I might have
managed to decode it, but I just don't know this (code | modulation).
Manuel
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> Yes, sorry. Were looking for coordinates in the form
>
> in Germany.
Well from what I can see the file is made up of two sets of 6 tones, each
repeated 3 times, and a background tone.
The background tone is at 1158 Hz, and the two sets of tones are at
655,981,603,655,1071,603 Hz and 981,512,554,476,831,476 Hz. Now those to me
look like they should be encoding the coordinates somehow. Assuming that
the coordinates are of the form 50.?5?? and 08.???? that would seem to work
(981 Hz = 0, 655 Hz = 5, etc). However I can't find any simple logical
reasoning for those digits to find out what the others should be...
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scott schrieb:
>> Yes, sorry. Were looking for coordinates in the form
>>
>> Wiesbaden in Germany.
>
> Well from what I can see the file is made up of two sets of 6 tones,
> each repeated 3 times, and a background tone.
>
> The background tone is at 1158 Hz, and the two sets of tones are at
> 655,981,603,655,1071,603 Hz and 981,512,554,476,831,476 Hz. Now those
> to me look like they should be encoding the coordinates somehow.
> Assuming that the coordinates are of the form 50.?5?? and 08.???? that
> would seem to work (981 Hz = 0, 655 Hz = 5, etc). However I can't find
> any simple logical reasoning for those digits to find out what the
> others should be...
Ok, thanks. The frequencies I measured are a few Hz off, but close
enough. Given 981 (980) for 0 and 655 (652) for 5. Ordering by frequency
(and guessing the ones not used) would give a code like in the attached
image. That leaves a problem: What to do with the -1?
At this point I should mention that there is a way to check if the found
coordinates are indeed the right ones: http://tinyurl.com/3cjo58
I already tried 596 516 and 496 at the end of the north coordinate, to
no avail.
Any more ideas?
Manuel
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Attachments:
Download 'geo.jpg' (23 KB)
Preview of image 'geo.jpg'
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> Ok, thanks. The frequencies I measured are a few Hz off, but close
> enough. Given 981 (980) for 0 and 655 (652) for 5. Ordering by frequency
> (and guessing the ones not used) would give a code like in the attached
> image. That leaves a problem: What to do with the -1?
>
Are the coordiantes usually in that format?
Why not:
??
Or do you always have 3 numbers after the point, meaning that the minutes
must be under 10?
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scott schrieb:
>
> Are the coordiantes usually in that format?
>
> Why not:
>
>
> ??
>
> Or do you always have 3 numbers after the point, meaning that the
> minutes must be under 10?
Have you seen minutes > 60 before?
(
Actually the riddle explicitly stated we look for coordinates of the form
Although I guess one might argue about the accuracy of this statement,
given the missing 0 for the east degrees...
)
Manuel
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