当一束对称的光点均等地入射到所有象限，该装置会产生的四股相等的电流，而这个光点就会被认为处在该设备的电中心。
When a symmetrical light spot is equally incident on all the quadrants, the device generates four equal currents and the spot is said to be located on the device's electrical center.
该方法使用具有分段连续的线性分段来近似正弦函数曲线的第一象限部分，根据正弦曲线的对称性，构成完整的正弦曲线。
A digital frequency synthesizer without ROM look up table is presented, a piecewise linear interpolation scheme is used to approximate a sinusoid function.
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