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hum

Electronics an undesired low-frequency noise in the output of an amplifier or receiver, esp one caused by the power supply

Hum

 

the name given during the Middle Ages to the region between Dubrovnik and the Neretva River. The earliest surviving reference to Hum dates from the 10th century and describes the region as subject to the Serbian prince Mihajlo Višević. Late in that century the region became part of Samuil’s state, and in 1018 it fell under Byzantine control. Hum became part of Zeta in the second half of the 11th century, part of the Nemanja state in the late 12th century, and part of Bosnia in the 1320’s. Duke (herceg) Stepan Vukčić took control of Hum in the 1440’s. The duke’s dominions, of which Hum constituted a major part, became known as Hercegovina in the mid-15th century.

hum

[həm]
(electricity)
A sound produced by an iron core of a transformer due to loose laminations or magnetostrictive effects; the frequency of the sound is twice the power line frequency.
(electronics)
An electrical disturbance occurring at the power supply frequency or its harmonics, usually 60 or 120 hertz in the United States.
References in periodicals archive ?
After analysing samples of the malware, security researchers discovered that Hummer spreads itself using a variety of domain names and infection points through third-party app stores where users are tricked into downloading malicious, fake versions of popular applications such as YouTube.
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The Hummer was equipped with an OnStar tracking device, which police said aided them greatly in the 15-minute chase through Templeton, Phillipston and Winchendon.
Dr James Brighton, from Cranfield University, is the brains behind the remote-controlled Hummer H3.
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As most of the functions on the vehicle are drive by wire anyway, Hummer says converting them to respond to a hand-held control was not difficult.