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[deadman]

[SOLVED] Chin Mae Park Pulsar's recording

[ellipses]

My first thought was to see if I could identify which pulsar it is (long shot I know) - but by measuring the time between the pulses it would appear quite likely that it is PSR 0329+54

You can hear a recording of this pulsar at http://www.radiosky.com/rspplsr.html

I wonder if we can find the original source .wav that was used and subtract it?

[enaxor]

I think this may be the original recording source. Does anyone out there have any sound visualization software? It might be interesting to see what the sounds look like. There's some odd noises toward the end of the recording that might yield a spectogram picture.

[Ehsan]

Ok so now what, hunt the pulsar? And then we find out we were supposed to be looking for a BULLsar all along? argh!


Anyway, comparing the .au enaxor found and the .wav from the blog shows an identical length/pattern. So I think it is the same one although I know nothing about pulsars. However, the spectrums don't match so they are not from the same source. The main noticable difference is the background noise which comes up in certain areas in the wav file.

Maybe if we can find the original wav file we can do a better comparison. Also, this can probably be solved without comparing things so I'll try some other things like slowing down, changing pitch, etc.

[ItWasntMeISwear]

Take a picture

[deadman]

-Removed... I meant for this to be sarcastic, but I think it was lost. Didn't mean to offend you ItWasntMe.

[ItWasntMeISwear]

Hehe...

[deadman]

I also measured the time yesterday, so I'll have to go back and double check again. But I got .7 seconds. There are differences between the two posted. I hear some added, softer clicks (not the spikes), and some wind sound. I think the wind sound is going to be the message- maybe speed it up to hear the sound clip. It doesn't really sound like a voice though... Either way, I think we should try and isolate that sound, amplify it, do frequency analysis and the whole nine yards. The softer clicks seem like the same kind of static that the pulsar is making, but maybe not.

The second posting is very close, but I am wondering if it is practical to try and find the exact recording. It is a good idea if we can do it, but what if we heard the same pulsar, just at a different time. I think we would be unable to tell the difference - the spikes are going to be regular, and so the resulting sound should be pretty similar too. Still, if we line up the sound properly, maybe just finding any recording from the same pulsar will be enough - subtracting the two waves might result in muted peaks, allowing us to hear the other message.

[ItWasntMeISwear]

No Subject

[deadman]

That's good info, but I don't hear voices straight out. So if they are in there, they are possibly either made faster or slower, which would change the frequency. But I've made the whole thing faster and slower, and as I expected, I still only hear a spacey - windy sound. I think the message has to do with that, but I don't really know what to do with it, since it doesn't appear to be a voice with the message. It's not tones, so trying to find the frequency of the sound, even if we could isolate it, would not give us any solid numbers. What other things could we do to find a hidden message? I'm going to see what stegnagraphy programs exist for sound files, and try that next - but please someone beat me to it and just tell me what the answer is.

And the time between pulses is definitly around .7, the first post from elipses saying it was likely PSR 0329+54 seems like a good guess to me, since it is supposed to be .71. enaxor post with the original sound show me that they are might be different recordings, but almost definitly from the same pulsar. Still - after a bit of debating... I think he is right.

So, the screenshots below shows how similar they are. The top is the one is the one enaxor posted, the bottom is from Ares (in stereo sound). In the first one we are looking at three big audible clicks here - but then there is a smaller sound that appears in the middle of the second and third - even that lines up. And there is no denying that the shapes of the clicks look similar also. There is sound added to it of course, but we know that. The important thing is that EVERY single location where there was a blip in the "source" recording, there is a blip in the Ares file. There are blips in the Ares files that seem to be from a pulsar recording though, and do not appear in the source, so I'm not sure.. I really want to find the difference between the two tracks, but have been unable to figure out how to do it.

EDIT: Another important thing to note is that they even end on the same click. That is a very good indicator to me they use the same file as a source.

[ItWasntMeISwear]

Okay...

[deadman]

I cannot download the file. It stops around 3.2 megs. It has done this serveral times in a row, spaced out over the past 2 hours, give or take. Do you have anywhere else you can post the file? how about www.ripway.com. you can get a free place to dump 30 megs online there.

[Russell]

I just tried it and it worked first time, might be your connection? Im at work as well in IT so nice and fast connection, most stuff I cant access especially IRC but this ones fine.

[deadman]

Well, the connection i'm on is normally fast... at work (but my access is not limited) on dual T1 or T3, not sure which.. but i've uploaded around 80k per second here and download at 300 or so, and I don't even do a lot here, so maybe those numbers get much larger. But I'm willing to buy that for whatever reason, the path through the internet is not really working right although I can't say why. Is anyone else having problems?

[EmmanuelGoldstein]

playing back the files they're not the same durations between the pulses, the pulsar wav we were given is slightly faster then the one linked to. Playing them back simultaneously pulsar wav was a few milliseconds after PSR 0329+54 but in the course of playing the wav it shifted to being even with it, then before it. Attached though is a quick and dirty filter to remove pulsar bursts.