hum

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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 classic literature ?
Thus, the attorney of Bevis Marks sat, and wrote, and hummed, for a long time, except when he stopped to listen with a very cunning face, and hearing nothing, went on humming louder, and writing slower than ever.
When any such entity begins to think it is not receiving fair value for its investment--if the particular invoice printer they are watching is not humming as a result of their support of a particular institution--the funding for that institution will cease in a heartbeat.
Over time I learned that he was following the music and phrasing through his humming.
AeroCopter Inc has launched a new angle on a 50-year old concept with the announcement of the Humming tilt-rotor aircraft, which aims to offer lower cost regional transportation.
MYSTERY humming is a worldwide phenomenon that would fox even X-Files agents Scully and Mulder.
This morning I caught myself humming "Trees," Joyce Kilmer's poem set to music.
release of SHINOBI, the whitelist-based cyber defense and antivirus system by Humming Heads, Inc.
I worked on the excavations of the Kingsway Tunnel and under the bedrock of the River Mersey in 1969/70 I and many others heard a humming sound which could not be traced.
into the scimitars black at the tips mud-- caked and humming as they dig
She said: "You've got to do a lot of humming to warm up.
I love the idea of machines humming, summer humming, an old spinster or curate humming hymns.
SANTA CLARITA - The Santa Clarita Master Chorale's final concert of the season is described as a night filled with beautiful lyrics that will send listeners home humming.