217 ウェーブレット変換によるカレントビューア信号の多重解像度解析

抄録

Previously, we have proposed a current viewer in order to visualize the current distributions in the electronic circuits. We have succeeded in obtaining the good results for one-dimensional current distributions after de-convoluting the space transfer characteristics from the current viewer's output signals.
In the present paper, we try to visualize the two-dimensional current distributions in a printed circuit by combining the space characteristic de-convolution with the vector wavelets transforms.
At first, we independently measure the output signals when scanning the current viewer in the direction of x-and y-directions.
Second, we carry out the de-convolution operations to remove the space transfer characteristics from the output signals.
Third, we constitute the two-dimensional current vectors by combining the de-convoluted x-and y-directed signals.
Finally, we apply the vector wavelet transform to the noisy current vectors in order to extract the major current vector distributions.
As a result, it is revealed that a series of convolutions among the major current vectors extracted by the wavelet transforms employing different base functions visualizes the current vectors in the two-dimensional printed circuit without any threshold operations.