Heh, can you (or somebody else) add this nice explanation to the article itself? I don't know enough about the subject to add it with any degree of confidence myself. The tablet forwards this and other relevant information (pen position, side-switch status, Tool ID, etc.) in packets, up to 200 times per second, to the computer. This signal change is communicated to a modulator which distributes the information digitally to the tablet. For example, applying more or less pressure to the tip of the pen changes the value of the pen’s timing circuit capacitor.
In addition, the pen communicates other vital information, such as pressure-sensitivity, side-switch status, tip or eraser orientation and Tool ID. This information is then analyzed by the computer to determine the pen’s position. In receive mode, the energy of the resonant circuit’s oscillations in the pen is detected by the tablet’s grid. In send mode, the tablet’s electromagnetic signal stimulates oscillation in the pen’s coil-and-capacitor circuit. Under the tablet’s surface (or LCD in the case of the Cintiq) is a grid of wires that transmits a send and receive signal.
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As a result, there are no batteries inside the pen that will run down and need to be replaced, creating a long and virtually maintenance free lifespan. Since the tablet provides power to the pen through resonant coupling, no batteries or cords are required. Wacom tablets use a patented electromagnetic resonance technology. If you ask specific questions, I can try and answer them -Preceding unsigned comment added by 204.119.25.115 ( talk) 00:01, 26 June 2008 (UTC) Its difficult to put too much detail about the technology since it is copy righted. I agree - it would be very interesting to know how the tablet can get such accurate positional information, as well as analog pressure readings and button presses from an independent (wireless) pen. This article could use some information on how the tablets work I see that someone changed "virtually" to "essentially" but this section is still at odds with the Criticism section which describes the unusually rapid wearing of the nib and drawing surface. "creating a long and virtually maintenance free lifespan.", etc. This article sounds much like an advertisement.
I added that Wacoms have superior, high, predictable sampling rate with x and y almost simultaneously so they can ALSO be used to record handwriting and drawing movements. Preceding unsigned comment added by 81.38.255.166 ( talk) 14:25, (UTC) comments The 531 khz is not a mandatory requirement.
Rummaging through the forum of the "DiY Cintiq" people, you can find that Intuos and Graphire tablet works with a frequency between 665 and 670 khz (joke on them being "built by te devil") Actual working frequencies seems depending from a lot of "external" factors, such as avoiding interferencies between the tablet and the screens in the CIntiqs based on the various Intuoses.
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