We have constructed a homogeneous two-dimensional sensor array and have developed the sensing system for automatically estimating the direction of gas/odor flow. Here, we studied a digital circuit for automatic estimation of that direction LMS algorithm was adopted instead of inverse-matrix operation so that its hardware c6uld he easily realized. Many modules with the same circuits composed of adders and multipliers for 1-bit digital signal processing method are connected to each other. The circuit outputs of FPGA agreed well with theoretical ones when the actual data stored in a ROM were input to the circuit.
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