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.
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We estimate this class has low quality
In a random sample of videos for this class, we found 3 / 10 (30%) were accurate. Note that quality in the unbalanced training set may be significantly lower.
Evaluation videos for Mains hum
View all 62 videos
Balanced train videos for Mains hum
View all 67 videos
Unbalanced train videos for Mains hum
View all 310 videos