| 摘要 |
<p>PURPOSE:To provide an automobile switch device which can prevent malfunctioning caused by an external noise when a signal is transmitted between a steering and a car body and enables bidirectional signal transmission to be effected. CONSTITUTION:In addition to a DC current passage 6 which is an alarming horn line, a DC current passage 4 is provided between a steering H and a car body B. The DC current passage 4 is used to transmit frequency code signals from the steering H from a transmission circuit 203 to a car body B after AC coupling in a superposed circuit 2032 and to transmit signals corresponding to these signals from the car body B by varying the electric potential of the DC current passage 4 by means of a potential-variable circuit 305. This simple constitution allows signals to be transmitted bidirectionally without being affected by external noises.</p> |
