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I think the IR Touch hardware is based on a chip made by Neonode, so you might want to see which chip corresponds to their naming convention/numbering and check out a datasheet from them. I'm guessing you'll probably find a very good example of their basic implementation.
Based on the spacing between sensors and the apparent resolution vs. the number of discrete sensor pairs I'd hazard a guess that they might even detect if you're blocking adjacent sensors on the same axis and interpolate to provide higher resolution.
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