Never mind, I use free gEDA as well (in the hope) to do professional work
and I shamelesly ask it to be even better than commercial.
To answer your question: as can be seen from the definitions given at
http://en.wikipedia.org/wiki/Root_mean_square
a rms-function can be defined in two ways:
a) non-continuous as the sequence of points describing pieces between
adjecent
extrema of the input signal
b) continuous as a moving average with a fixed integration interval delta_t
If a) is used I assume a spline is used to fake a continous function, but
it's more likely to see b) used, which of course requires some voodoo to
determine delta_t. It's exactly this which I don't like about commercial ;-)
Armin
Rubén Gómez Antolí wrote:
Hello Armin:
Thanks for your response.
El 16/06/10 15:16, Armin Faltl escribió:
To the best of my knowledge, the RMS-value (root mean square) is a
constant,
i.e. the waveform would be a straight horizontal line. The definition of
the value comes from power considerations: it's the constant
current/voltage
that produces the same power(-dissipation) as the signal.
I'm not completly sure but, these are true when the signal is regular
and periodic.
If you have a "strange" wave, you get a time-variant rms wave. Look a
example on top of page 3 in this PDF:
http://fie-conference.org/fie96/papers/219.pdf
(plot RMS(i(r)))
Armin
Sincerily, I thought that this are more usual, but there are very few
references on web and nothing in how to obtain in "free world" (at
least, I can't find it).
Best regards.
Salud y Revolución.
Lobo.
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