JPS533799A - Ultrasonic alert device - Google Patents

Ultrasonic alert device

Info

Publication number
JPS533799A
JPS533799A JP7825776A JP7825776A JPS533799A JP S533799 A JPS533799 A JP S533799A JP 7825776 A JP7825776 A JP 7825776A JP 7825776 A JP7825776 A JP 7825776A JP S533799 A JPS533799 A JP S533799A
Authority
JP
Japan
Prior art keywords
alert device
ultrasonic
phase change
noise
ultrasonic alert
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
JP7825776A
Other languages
Japanese (ja)
Inventor
Hiroshi Ohashi
Hironobu Inoue
Susumu Katayama
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 JP7825776A priority Critical patent/JPS533799A/en
Publication of JPS533799A publication Critical patent/JPS533799A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To prevent false operation owing to disturbance noise by detecting the disturbance noise of less amount of phase change with a phase change amount detection circuit even if said noise enters, in an ultrasonic alert device using doppler effect.
COPYRIGHT: (C)1978,JPO&Japio
JP7825776A 1976-06-30 1976-06-30 Ultrasonic alert device Pending JPS533799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7825776A JPS533799A (en) 1976-06-30 1976-06-30 Ultrasonic alert device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7825776A JPS533799A (en) 1976-06-30 1976-06-30 Ultrasonic alert device

Publications (1)

Publication Number Publication Date
JPS533799A true JPS533799A (en) 1978-01-13

Family

ID=13656928

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7825776A Pending JPS533799A (en) 1976-06-30 1976-06-30 Ultrasonic alert device

Country Status (1)

Country Link
JP (1) JPS533799A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5856778A (en) * 1996-02-29 1999-01-05 Denso Corporation Intrusion detecting apparatus for a vehicle
US6198385B1 (en) 1998-11-11 2001-03-06 Nippon Soken, Inc. Entering detecting system for vehicles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5856778A (en) * 1996-02-29 1999-01-05 Denso Corporation Intrusion detecting apparatus for a vehicle
US6198385B1 (en) 1998-11-11 2001-03-06 Nippon Soken, Inc. Entering detecting system for vehicles

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