公开(公告)号：US5760700A

公开(公告)日：1998-06-02

申请号：US711672

申请日：1996-09-04

Applicant: Antony Mark Ellis

Inventor： Antony Mark Ellis

IPC: B60R25/10 ,  H04Q1/00

CPC classification number: B60R25/1003

Abstract: The security system involved in the arming and disarming of a car alarm, includes a transmitter and a receiver. Both transmitter and receiver includes oscillators incorporating a highly accurate and stable quartz time base. Each oscillator drives a respective encoder to develop a pseudo random succession of codes. Reset switches are provided for both transmitter and receiver to synchronize the two oscillators and therefore to synchronize the succession of codes. The receiver includes a decoder for decoding the received signals and a comparator for comparing the decoded signal with the signal generated by the encoder. When equality is detected an arm/disarm circuit is triggered. Because the codes of the transmitter and receiver are continually changing, it makes it very difficult for a thief to produce a coded signal which will trigger the arm/disarm circuit.

Abstract translation: 涉及汽车警报器布防和撤防的安全系统包括发射机和接收机。 发射器和接收器都包括具有高精度和稳定的石英时基的振荡器。 每个振荡器驱动相应的编码器来开发伪随机连续的代码。 为发送器和接收器提供复位开关，以使两个振荡器同步，从而同步连续的代码。 接收机包括用于对接收到的信号进行解码的解码器和用于将解码信号与由编码器产生的信号进行比较的比较器。 当检测到相等性时，触发臂/撤防电路。 由于发射机和接收机的代码不断变化，所以使得小偷难以产生编码信号，从而触发臂/撤防电路。