Comet 67P's "Song"
19 August 2014, Posted previously (3 months ago)
Re: Rosetta pursuit - did we get there first ?
« Reply #29 on: August 19, 2014, 05:28:29 PM »
NASA detected radio bursts from this "Comet".
Can change trajectory at will.
Shows signs on the outside of machine like parts.
Being disguised as a comet.
Sounds like crap.......until
11 November 2014, ESA announces that comet is singing a "song":
On the night of November 11, 2014, ESA announced that the Rosetta spacecraft
carrying the Philae lander had recorded a “song” emanating from Comet
67P/Churyumov-Gerasimenko. Rosetta’s Plasma Consortium – a suite of five
instruments used to study 67P – detected the sound, which cannot be heard by
the human ear at 40 to 50 millihertz (outside the range of human hearing).
Download actual MP3 audio file from here:http://www.classicfm.com/discover/music/singing-comet-67p-philae/
The following screenshots were produced using a program called Raven. The
program allows the user to examine sound files (in this case WAV files), while
producing both a graphical signal window, and a graphical spectrogram window.
The original file was in MP3 format and was converted to WAV format which is
one of the required formats for this particular software.
The program (RAVEN Lite) is available (free) from Cornell University here:http://www.birds.cornell.edu/brp/raven/ravenoverview.html
Now to the signal itself.
The signal occurs on two channels, and is slightly different.
From the beginning, I suspected this to have more data than just what was
observed from this original capture.
It reminded me of a possible compressed data signal. So the following examples
were generated for the entire signal at 1 minute, at 10 seconds, at 1 second
and at 3/10ths of a second.
As is evident, this process revealed what appears to be an actual analog
Signal is on top, Spectrogram on the bottom in each frame.
If you listen to the sound at a slower speed, it sounds just like (to me) a
motor running at slow speed and then increasing and decreasing its speed at
various points in the file, due to (perhaps) a load on the motor.
There may be additional information other than the "motor" sound which seems to be a background event. At this point
Still examining the file using various other software.
You can use the cited program (RAVEN) to listen to the file at a RATE value of .3 or locate another program which will allow you to slow down the playback.