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This paper generalizes the capacitive touch sensing problem in a form of weighing matrices which cover Walsh-Hadamard, 4k-order Hadamard, and other types of weighing matrices. The existing regular Hadamard matrix, conference matrix, and other matrices that have a small sum of column weights, increase the signal sensitivity as well as signal-to-noise ratio for the capacitive signals. Experiments show...
In recent years, simultaneous driving and sensing techniques for capacitive sensors have used to obtain high signal-to-noise ratio for given time limit of the touch system. In this paper, we show more effective utilization of design constraints of touch system by the use of the variants of 4k-order orthogonal codes. It is also possible to ease the specification of input stages of receivers in capacitive...
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