发明名称 |
Method of generating an alert for walkie-talkie when out of communicatable distance |
摘要 |
A method of generating a warning signal for a walkie-talkie includes: providing a detector and a timer; using the timer to count time; using the detector to determine whether the strength of a radio frequency (RF) signal which includes a standard CTCSS tone received by the walkie-talkie is larger than a predetermined value; using the detector to determine whether the strength of a RF signal which includes a non-standard CTCSS tone received by the walkie-talkie is larger than the predetermined value; if so, resetting the timer; and issuing a warning signal when the time counted by timer reaches a predetermined time.
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申请公布号 |
US6816070(B1) |
申请公布日期 |
2004.11.09 |
申请号 |
US20030249587 |
申请日期 |
2003.04.22 |
申请人 |
CONWISE TECHNOLOGY CORPORATION LTD. |
发明人 |
HSU JANY-YEE;CHEN MING-HUI |
分类号 |
H04B1/10;H04B1/46;(IPC1-7):G08B1/08 |
主分类号 |
H04B1/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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