Editing 1590: The Source
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There do, however, exist devices that are meant to create a high pitched hum, that people might wish to install in their house. These will be humming in the {{w|ultrasound|ultrasonic}} regions, although cheap versions can often be heard by young people. They are typically used for {{w|Electronic_pest_control#Ultrasonic|electronic pest control}}, while slightly lower frequencies which can typically be heard only by young people are sometimes used to {{w|The Mosquito|repel children}}. It is possible that someone tried to get rid of Cueball. | There do, however, exist devices that are meant to create a high pitched hum, that people might wish to install in their house. These will be humming in the {{w|ultrasound|ultrasonic}} regions, although cheap versions can often be heard by young people. They are typically used for {{w|Electronic_pest_control#Ultrasonic|electronic pest control}}, while slightly lower frequencies which can typically be heard only by young people are sometimes used to {{w|The Mosquito|repel children}}. It is possible that someone tried to get rid of Cueball. | ||
β | There do exist {{w|white noise}} generators (which make equal volume noise on every frequency) and {{w|pink noise}} generators (which make noise that | + | There do exist {{w|white noise}} generators (which make equal volume noise on every frequency) and {{w|pink noise}} generators (which make noise that sounds equally loud to the human ear at every frequency) which are used to test recording studios to see if they have good sound quality. It seems unlikely that the device is one of these, as it seems to be designed to generate a high-pitched hum: pink/white noises are categorically and perceptually different from a hum. |
The sound wave spectrum in [[273: Electromagnetic Spectrum]] also contains a line for "that high-pitched noise in empty rooms". | The sound wave spectrum in [[273: Electromagnetic Spectrum]] also contains a line for "that high-pitched noise in empty rooms". |