JPS533799A - Ultrasonic alert device - Google Patents
Ultrasonic alert deviceInfo
- 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
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
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)
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 |
-
1976
- 1976-06-30 JP JP7825776A patent/JPS533799A/en active Pending
Cited By (2)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5349639A (en) | Detector for rotary reference position | |
JPS51126171A (en) | Detecting device of moving object | |
JPS5353386A (en) | Time difference detection circuit | |
JPS533799A (en) | Ultrasonic alert device | |
JPS5297757A (en) | Position detector | |
JPS5224100A (en) | Invasion alarm device | |
JPS5374900A (en) | Ultrasonic alarm | |
JPS5210170A (en) | Liquid surface detector | |
JPS5374899A (en) | Ultrasonic alarm | |
JPS52123892A (en) | Display unit | |
JPS5374897A (en) | Ultrasonic alarm | |
JPS5361999A (en) | Ultrasonic guarding device | |
JPS5217064A (en) | Vehicle and speed detector unit | |
JPS5315171A (en) | Signal level detection circuit | |
JPS5346067A (en) | Ultrasonic detector | |
JPS53106599A (en) | Ultrasonic alarm device | |
JPS5353750A (en) | Abnormality detection system in i/o devices | |
JPS5438798A (en) | Ultrasonic warning device | |
JPS5272257A (en) | Multiple point type liquid level device | |
JPS5376871A (en) | Revolution stop detector | |
JPS52100948A (en) | Processor malfunction detection system | |
JPS5315525A (en) | Unbalanced current detection in cycloconverter | |
JPS5287319A (en) | Abnormality detecting procedure | |
JPS51126798A (en) | Ultrasonic alarming unit | |
JPS52106446A (en) | Absent phase detector |