Hierarchy
Description A low, continuous tone caused by electromagnetic interference from the alternating current of the mains electricity. The fundamental frequency of this sound is usually 50 Hz or 60 Hz, depending on the local power-line frequency.
URI http://en.wikipedia.org/wiki/Mains_hum
Siblings
Examples
# audio samples
237
# ground truth
7     (propagated from children: 0)

Audio samples with candidate annotations for
Mains hum