Movatterモバイル変換

[0]ホーム

Jump to content

Channel noise level

Add links

From Wikipedia, the free encyclopedia

Noise measurement in telecommunications

This article has multiple issues. Please helpimprove it or discuss these issues on thetalk page.(Learn how and when to remove these messages)

This articleneeds additional citations forverification. Please helpimprove this article byadding citations to reliable sources. Unsourced material may be challenged and removed.
Find sources: "Channel noise level" – news ·newspapers ·books ·scholar ·JSTOR(February 2007) (Learn how and when to remove this message)

This article includes alist of references,related reading, orexternal links,but its sources remain unclear because it lacksinline citations. Please helpimprove this article byintroducing more precise citations.(February 2020) (Learn how and when to remove this message)

(Learn how and when to remove this message)

Intelecommunications, the termchannel noise level has the following meanings:

The ratio of thenoise in thecommunication channel at any point in atransmission system to an arbitrary level chosen as a reference.^[a]^[b]
The noisepower spectral density in the frequency range of interest.
The average noise power in the frequency range of interest.

Notes

[edit]

^The channelnoise level may be expressed in (a)dB abovereference noise (dBrn), (b) dB above reference noise withC-message weighting (dBrnC), or (c) adjusted dB (dBa).
^Each unit used to measure channel noise level reflects acircuit noise reading of a specialized instrument designed to account for differentinterference effects that occur under specified conditions.