Mains hum, electric hum, or power line hum is an audible oscillation of alternating current at the frequency of the mains electricity, which is usually 50 Hz or 60 Hz, depending on the local power line frequency. The sound often has heavy harmonic content.
Read more about Mains Hum: Causes of Electric Hum, Prevention, Tone, In Music, In Audio Systems, In Forensics
Famous quotes containing the word hum:
“Buz, quoth the blue fly,
Hum, quoth the bee,
Buz and hum they cry,
And so do we:
In his ear, in his nose, thus, do you see?
He ate the dormouse, else it was he.”
—Ben Jonson (1572–1637)