| 摘要 |
<p>PURPOSE:To facilitate confirmation of lowering of a battery voltage by detecting a source voltage to compare it with a reference voltage, and changing the display content of. a display means according to a comparing means. CONSTITUTION:In an on-vehicle audio device, a voltage detecting comparator 2 compares the voltage of a power source 1 with that of a reference voltage generator 3, and a result is outputted to a control device 5 through an A/D converter 4. The control device 5 controls a display controls a display control circuit 6 based on an input to the control device to change the display state of a display device 7, and the voltage of the power source 1 is displayed. The reference voltage generator 3 generates a reference voltage by means of a power from the power source 1, and the reference voltage is kept at a constantly specified value not depending upon the power source of the power source 1. When the control device 5 confirms lowering of the voltage of the power source 1 by means of an input from an A/D converter 4, a display unit 7 is flickered through the display control circuit 6 to reduce a voltage.</p> |
