Talk:Carrier-to-noise ratio

Incorrect image?
The image illustrates CNR as a ratio of spectral power densities; surely this is incorrect? CNR is defined as a power ratio, spectral densities don't tell you this unless you also know the signal and noise bandwidths. Oli Filth(talk&#124;contribs) 19:34, 31 August 2009 (UTC)


 * No answer, so I've removed the image for now. Oli Filth(talk&#124;contribs) 23:38, 10 September 2009 (UTC)

dB or dBm
Hi Mange01 (and other editors). Re: your recent edit, I don't think we need to state dBm in the third equation - it's artificially restrictive. Decibels are, by their nature, a relative measurement, with dBm being one possible reference point to make them absolute. I think that when a ratio of two figures is given in dB, it is understood that they should be relative to the same reference. That's part of the beauty of dB - they easily adjust to whatever scale is convenient. For example, when I measure a ratio on the Network analyser, I use an arbitrary reference to keep the plot on screen. Provided that I make both measurements of the ratio to the same reference, it doesn't affect the end result. Would you agree? GyroMagician (talk) 11:55, 9 March 2010 (UTC)

(C+N)/N
it would be useful to include a section on (C+N)/N, which is more easily measured on a Spectrum Analyser, and how it relates to C/N ie. C/N = 10log10(((C+N)/N)/10 + 1) — Preceding unsigned comment added by 192.48.8.20 (talk) 05:50, 17 November 2017 (UTC)