发明名称 |
Method and apparatus for increasing the response sensitivity and the interference resistance in an alarm system |
摘要 |
A method and apparatus for increasing the response sensitivity and the interference resistance in an alarm system such as a fire alarm system which cyclically samples a plurality of alarm units in the system for obtaining a series of measured values from each alarm unit, the measured values being utilized to form a quiescent value which is stored in a quiescent value memory. With each sampling cycle a current comparison value is formed from the alarm measured value, the stored quiescent value, and a comparison value from a previous sampling cycle stored in a comparison value memory. The current comparison value is then written in the comparison value memory as the new comparison value. The current comparison value is compared with a rated limiting value, and if the comparison value is greater than or equal to the rated limiting value, a display unit is activated indicating an alarm. If the comparison value is less than the rated limiting value, a new quiescent value is formed from the measured value and the stored quiescent value and written into the quiescent value memory.
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申请公布号 |
US4514720(A) |
申请公布日期 |
1985.04.30 |
申请号 |
US19820375316 |
申请日期 |
1982.05.05 |
申请人 |
SIEMENS AKTIENGESELLSCHAFT |
发明人 |
OBERSTEIN, KARLA;THILO, PEER |
分类号 |
G08B26/00;G08B29/18;(IPC1-7):G08B29/00 |
主分类号 |
G08B26/00 |
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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