JPS644898A - Theft preventing device - Google Patents
Theft preventing deviceInfo
- Publication number
- JPS644898A JPS644898A JP16059287A JP16059287A JPS644898A JP S644898 A JPS644898 A JP S644898A JP 16059287 A JP16059287 A JP 16059287A JP 16059287 A JP16059287 A JP 16059287A JP S644898 A JPS644898 A JP S644898A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- alarm
- detected
- active
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Alarm Systems (AREA)
Abstract
PURPOSE:To prevent an erroneous alarm from being generated due to a malfunction caused by a disturbing wave, etc., from the outside, by outputting an alarm signal in case a modulation signal of other frequency has been detected continuously from a modulation signal of the first frequency. CONSTITUTION:In case a modulated wave signal containing a component of a frequency f3 has been detected, a holding circuit 24 maintains an output of a one shot pulse signal S24 of H active, based on a signal S25 outputted from a detector 25. When a signal containing a component of a frequency f4 is inputted, a detector 32 outputs a pulse signal S32 of H active of pulse width corresponding to a period in which this frequency component is detected. Therefore, in an AND gate 29, AND of the signal S24 and the signal S32 is derived, and as a result, a pulse signal S29 of H active is applied to a control terminal 33c of a switch circuit 33, and the switch circuit 33 becomes ON, namely, a conducting state, drives an alarm 18 and generates an alarm. In such a way, only is case the signal of the frequency f3 and the signal of the frequency f4 have been detected about simultaneously, an alarm is generated by the alarm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16059287A JPS644898A (en) | 1987-06-27 | 1987-06-27 | Theft preventing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16059287A JPS644898A (en) | 1987-06-27 | 1987-06-27 | Theft preventing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS644898A true JPS644898A (en) | 1989-01-10 |
Family
ID=15718284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16059287A Pending JPS644898A (en) | 1987-06-27 | 1987-06-27 | Theft preventing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS644898A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5076776A (en) * | 1989-02-28 | 1991-12-31 | Mitsubishi Plastics Industries Limited | Annular die for a lamination product |
-
1987
- 1987-06-27 JP JP16059287A patent/JPS644898A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5076776A (en) * | 1989-02-28 | 1991-12-31 | Mitsubishi Plastics Industries Limited | Annular die for a lamination product |
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