JPS5374898A - Ultrasonic alram - Google Patents

Ultrasonic alram

Info

Publication number
JPS5374898A
JPS5374898A JP15406876A JP15406876A JPS5374898A JP S5374898 A JPS5374898 A JP S5374898A JP 15406876 A JP15406876 A JP 15406876A JP 15406876 A JP15406876 A JP 15406876A JP S5374898 A JPS5374898 A JP S5374898A
Authority
JP
Japan
Prior art keywords
alram
ultrasonic
envelope curve
malfunction
eliminate
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
JP15406876A
Other languages
Japanese (ja)
Inventor
Hiroshi Ohashi
Hironobu Inoue
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP15406876A priority Critical patent/JPS5374898A/en
Publication of JPS5374898A publication Critical patent/JPS5374898A/en
Pending legal-status Critical Current

Links

Landscapes

  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE: To prevent the disturbance noise effect and to eliminate the malfunction by utilizing the amplitude envelope curve of the receiving output which is detected at the envelope curve detector circuit as well as the changing direction of the phase difference.
COPYRIGHT: (C)1978,JPO&Japio
JP15406876A 1976-12-15 1976-12-15 Ultrasonic alram Pending JPS5374898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15406876A JPS5374898A (en) 1976-12-15 1976-12-15 Ultrasonic alram

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15406876A JPS5374898A (en) 1976-12-15 1976-12-15 Ultrasonic alram

Publications (1)

Publication Number Publication Date
JPS5374898A true JPS5374898A (en) 1978-07-03

Family

ID=15576183

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15406876A Pending JPS5374898A (en) 1976-12-15 1976-12-15 Ultrasonic alram

Country Status (1)

Country Link
JP (1) JPS5374898A (en)

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