| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide wireless device for a crime prevention system which can use signals of two frequency bands simultaneously with a simple and inexpensive structure. <P>SOLUTION: A reception device 40 for a crime prevention system which receives a signal from a crime prevention sensor 2 includes a wireless transmission/reception unit 41 having an antenna 45 for transmitting and receiving a signal with a first frequency and a signal with a second frequency, and a control unit 44 for performing a control based on the content of a signal. The wireless transmission/reception unit 41 includes an antenna side connection unit 46, a control unit side connection unit 49, a first signal processing unit 47, and a second signal processing unit 48. The first signal processing unit 47 converts a signal with the first frequency into a signal of a first system and outputs it to the control unit 44, as well as outputs the signal of the first system input from the control part 44 in the first frequency. The second signal processing unit 48 converts a signal with the second frequency into a signal of the first system and outputs it to the control part 44, as well as converts the signal of the first system input from the control part 44 into a signal of a second system and outputs it in the second frequency. <P>COPYRIGHT: (C)2012,JPO&INPIT |
