JPS644898A - Theft preventing device - Google Patents

Theft preventing device

Info

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
Application number
JP16059287A
Other languages
Japanese (ja)
Inventor
Kazutoyo Kajita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP16059287A priority Critical patent/JPS644898A/en
Publication of JPS644898A publication Critical patent/JPS644898A/en
Pending legal-status Critical Current

Links

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  • 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.
JP16059287A 1987-06-27 1987-06-27 Theft preventing device Pending JPS644898A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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