| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a transmitter which can prevent interference and enables a receiver to correctly receive ID information when a radio tag or an RF-ID tag is attached to every product or item and the radio tag or the RF-ID tag transmits the ID information in one and the same frequency. <P>SOLUTION: In a device for transmitting its own ID information in the same frequency and in unfixed periods a plurality of times, the transmitter is provided with: a numerical number generating means for generating M numerical numbers (M is an optional integer) which do not overlap each other; a receiving means for receiving a radio signal; a clock decoding means for decoding a clock from the radio signal received by the receiving means; a clock counting means for counting the decoded clocks; and an ID information transmitting means for transmitting ID information of the transmitter itself M times when the number of the counted clocks coincides with the M numerical numbers. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
