发明名称 |
Pulse code modulation responsive alarm system |
摘要 |
A system for producing an alarm whenever the distance between a transmitter and a receiver exceeds a predetermined distance. The transmitter includes circuitry for generating a signal having a preselected pulse code modulation pattern. The receiver includes circuitry for responding to the particular pulse code pattern and for sounding an alarm when the signal from the transmitter is so weak that pattern is not received.
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申请公布号 |
US4260982(A) |
申请公布日期 |
1981.04.07 |
申请号 |
US19790088034 |
申请日期 |
1979.10.25 |
申请人 |
DEBENEDICTIS, ANGELO P.;ZORZY, PLATO |
发明人 |
DEBENEDICTIS, ANGELO P.;ZORZY, PLATO |
分类号 |
G08B3/10;G08B13/14;(IPC1-7):G08B3/10 |
主分类号 |
G08B3/10 |
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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