On 2/18/08, Carlos E. R. <robin.listas@telefonica.net> wrote:
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The Monday 2008-02-18 at 11:01 +0100, Neil wrote:
I seem to have forgotten what the bar meant. I knew it when I needed it for a test, but I lost it. Is it the arithmic mean? The arithmic mean is a way of averaging, if wikipedia (http://en.wikipedia.org/wiki/Arithmetic_mean) is correct. The average of a sine (if N cycles are taken) is 0.
But as in RMS it is squared first, it is always possitive.
If the arithmic mean of a sine is plotted over a time period the result would be the exact same sine.
The mean of the squares would be a flat line, at peak(squares) / root(2)
The result of this would be that RMS is a useless value. It is not, and therefore my reasoning must be flawed somewhere. Does anyone have the time, knowledge and will to take the quest of finding this flaw? I seem to be unable to.
Better here:
Okay, here I can see: SQRT(MEAN(x^2)) (in pseudocode). The bar above the x in the original formula didn't show it was also above the ^2. Thanks. Neil
- -- Cheers, Carlos E. R.
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