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)))ArminSincerily, 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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