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attenuation
n. 变薄,稀薄化,弄细,衰减 变薄,稀薄化,弄细,衰减 attenuation 衰减 ATTEN attenuation 衰减 attenuation n 1: weakening in force or intensity; "attenuation in the volume of the sound" [synonym: {attenuation}, {fading}] 2: the property of something that has been weakened or reduced in thickness or density Attenuation \At*ten`u*a"tion\, n. [L. attenuatio: cf. F. att['e]nuation.] 1. The act or process of making slender, or the state of being slender; emaciation. [1913 Webster] 2. The act of attenuating; the act of making thin or less dense, or of rarefying, as fluids or gases. [1913 Webster] 3. The process of weakening in intensity; diminution of virulence; as, the attenuation of virus. [1913 Webster] signal as it travels farther from the point of origin. For example, an electric signal's amplitude reduces with distance due to electrical {impedance}. Attenuation is usually measured in {decibels} [per metre?]. Attenuation does not imply appreciable modification of the shape of the waveform (distortion), though as the signal amplitude falls the {signal-to-noise ratio} will also fall unless the channel itself is noise free or the signal is amplified at some intermediate point(s) along the channel. ["Networking Essentials, second edition", Microsoft Corporation, pub. Microsoft Press 1997]. (2003-07-29)
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