木质外箱，可寻址解码开关机，调频双通道。
主要开关阵列、第一预解码开关阵列以及第二预解码开关阵列的组合实质上为一矩形布局结构。
The combination of the main switch array, the first pre-decoding switch array and the second pre-decoding switch array is virtually a rectangular arrangement structure.
第二预解码开关阵列用以接收数字数据，当数字数据在一第三范围内时预解码部份数字数据以及输出电压。
The second pre-decoding switch array is used for receiving the digital data, and pre-decoding the partial digital data and outputting the voltage when the digital data are within a third range.
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