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 periodicals archive ?
It''s believed the vibrations from humming relax the muscles around the voice box.
Dr Kim has undertaken similar humming ventures in Berlin and New Mexico, but this is the first time he has used a public booth where people can go and record their contribution.
In detail, with one input humming data, two matching distances (scores) by DTW and chroma-based DTW are calculated with one reference MP3 file, respectively.
Of the 18 dogs in the study, 15 approached their owner or Mayer during crying fits, while only six approached during humming.
Anchor's Fall Seasonal Humming Ale is offered in draft (5,16 gal.
We therefore careen forward rather crudely by allowing market forces to determine which entities survive and which fail with invoice printer humming the only, ultimate test.
I wish I had taped even a few of my lessons with Nagy, although it probably would have sounded like a piano playing against a background of humming, rustling papers, a few "Dah
MYSTERY humming is a worldwide phenomenon that would fox even X-Files agents Scully and Mulder.
I hate to use the phrase "God-given talent"--like a lot of people with God-given talent, I have always prided myself on my lack of pretense--but it's true that whistling and humming at the same time came to me naturally.
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.
4 : to give forth a low murmur of sounds <The street was humming with activity.
into the scimitars black at the tips mud-- caked and humming as they dig