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| Channel noise level ： ウィキペディア英語版 |
Channel noise level
In telecommunications, the term channel noise level has the following meanings:
#The ratio of the channel noise at any point in a transmission system to an arbitrary level chosen as a reference.〔The channel noise level may be expressed in (a) dB above reference noise (dBrn), (b) dB above reference noise with C-message weighting (dBrnC), or (c) adjusted dB (dBa).〕〔Each unit used to measure channel noise level reflects a circuit noise reading of a specialized instrument designed to account for different interference effects that occur under specified conditions.〕
#The noise power spectral density in the frequency range of interest.
#The average noise power in the frequency range of interest.
==Notes==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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