| 摘要 |
When more than one window of the door windows are opened, the potentiometer(Vp1-Vp4) resistance that matches the open windows increases, to the adder(34), the voltage signal that is determined by divided pressure of the resistance (R1,R3,R5,R7) and the resistance value of the potentiometer(Vp1-Vp4) is inputted that the output value of the adder(34) is determined as (VA+VB+VC+VD). This output value is converted into digital at analogue digital converter(36) and is transferred to the controller(30), the controller(30) revises the volume control data to the data that matches the digital signal of (VA+VB+VC+VD) and outputs to the volume control part(16).
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