Description
The air conditioner at the hotel humming away in the corner for ten hours. It’s noisier than residential air-conditioning, but definitely masks the sound of the noisy neighbors two doors down.
The fan is a noise component from moving air. Then there is the pronounced 60 Hz tone with upper harmonics like 120 Hz, 240 Hz, 600 Hz, and 1200 Hz based on the motor spinning at 1200 Hz and phase locked to the 60 cycle frequency.
1 and 10 hour audio mp3 downloads
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