Remote control security system for automobile issuing a fixed basic code and two variable codes
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United States of America Patent
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-
Nov 20, 2001
Grant Date -
N/A
app pub date -
Jun 5, 1995
filing date -
Jun 5, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A remote control security system includes a remote control unit, a receiving unit, and an operation unit connected to the receiving unit for performing or cancelling an alarm function. A combination code having a basic code and two sets of remedy codes is produced by an encoder. When the receiver has received the signals from the remote control unit, a decoder compares the basic code and the two sets of remedy codes received by the receiver with a reference basic code and two sets of remedy codes generated by the encoder and, if the received and reference codes match, the decoder sends a control signal to the operation unit. One of the remedy codes is varied by a counter once each time the remote control button is pushed and the other is varied by the counter during the time that the button is being pushed.
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