| 摘要 |
<p>A processor-based transmitter-receiver system and method (10) in which a receiver (150) receives coded signals from at least two transmitters (figure 1A). The receiver (150) comprises a circuit for receiving a first coded signal from a first transmitter (140) and a second coded signal from a second transmitter (figure 3A). Each of the coded signals includes a unique identification code and a variable security code (figure 4C). A memory (102, figure 2A) stores at least two codes, each including a unique identification code and a variable security code. A processor (100, figure 2A) coupled to the circuit and the memory (102), compares each of the received coded signals with each of the stored sets of codes. The processor generates a valid signal if one of the received coded signals matches one of the stored codes.</p> |
