JPS5374897A - Ultrasonic alarm - Google Patents

Ultrasonic alarm

Info

Publication number
JPS5374897A
JPS5374897A JP15406776A JP15406776A JPS5374897A JP S5374897 A JPS5374897 A JP S5374897A JP 15406776 A JP15406776 A JP 15406776A JP 15406776 A JP15406776 A JP 15406776A JP S5374897 A JPS5374897 A JP S5374897A
Authority
JP
Japan
Prior art keywords
ultrasonic alarm
alarm
ultrasonic
fixed
phase
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
JP15406776A
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 JP15406776A priority Critical patent/JPS5374897A/en
Publication of JPS5374897A publication Critical patent/JPS5374897A/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 eliminate the malfunction due to the noise by detecting the changing amount of a fixed phase and generating a signal only when the phase change occurs in a fixed direction.
COPYRIGHT: (C)1978,JPO&Japio
JP15406776A 1976-12-15 1976-12-15 Ultrasonic alarm Pending JPS5374897A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15406776A JPS5374897A (en) 1976-12-15 1976-12-15 Ultrasonic alarm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15406776A JPS5374897A (en) 1976-12-15 1976-12-15 Ultrasonic alarm

Publications (1)

Publication Number Publication Date
JPS5374897A true JPS5374897A (en) 1978-07-03

Family

ID=15576161

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15406776A Pending JPS5374897A (en) 1976-12-15 1976-12-15 Ultrasonic alarm

Country Status (1)

Country Link
JP (1) JPS5374897A (en)

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