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Here is the same recording, played at 3x speed, this affects the pitch of the recording and makes the sound stand out a lot more. It starts at low volume from the begining of the recording and, at this speed, stops at around 8.5s.
Change the display to spectrogram and you can clearly see it...
Here is the original recording;
http://freesound.org/people/AlienXXX/sounds/348515/#description
Recorded from my bedroom at around 9-10pm. The windown was open.
Does not sound like a car/motorbike/train/airplane. There is nothing in the room that would make any sound (refrigerator, air-conditioning, fan, etc).
I don't know what it is.
Type
Wave (.wav)
Duration
0:16.730
File size
2.8 MB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Stereo