White noise意思
"White noise" is a term that is used in various contexts, including physics, engineering, and more commonly, in reference to sound. Here are the main meanings of "white noise":
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Physics and Engineering: In physics and engineering, white noise refers to a type of noise that has equal power in all frequencies over the complete bandwidth of the noise. It is a stochastic process with a constant power spectral density. This means that the noise contains all frequencies equally, without any preference for a particular frequency. White noise is often used in signal processing, communication systems, and other areas where random signals are analyzed or generated.
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Sound: In the context of sound, white noise is a sound with a flat frequency spectrum. It contains all frequencies between 20 Hz and 20 kHz (the human hearing range), with each frequency having equal intensity. This results in a sound that is perceived as a hiss or a buzz, with no distinguishable pitch. White noise is often used in audio applications, such as in sound masking, audio testing, and for helping people to sleep or focus by drowning out other sounds.
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General Usage: In a more general sense, "white noise" can refer to any kind of constant background noise or static that is not specific to any particular signal or frequency. The term has been used metaphorically to describe things like constant background chatter, random static in a radio signal, or even visual noise in an image.
In popular culture and media, the term "white noise" is often used in a metaphorical way to describe something that is confusing, random, or overwhelming, but not necessarily harmful.