| 摘要 |
PURPOSE: A checking the lost using a transceiver is provided to prevent loss of mobile phone or other belongs by generating sound or vibration from a transmitting signal within radio frequency band. CONSTITUTION: An antenna unit(4) receives the appropriate data signal of the contactless transceiver/memory chip. The oscillating/mixing unit(6) mixes the amplified signal and oscillated signal of the RF(Radio Frequency) amplifier(5). A CPU(Central Processing Unit)(1) reads the digital signal of A/D(Analog to Digital) converting unit(8). A signal is weak, or in case error data signal is inputted, the CPU converts the output into on state. When the output of the CPU is on state, a buzzer operation part(9) generates a melody or vibration.
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