JPS5374898A - Ultrasonic alram - Google Patents
Ultrasonic alramInfo
- 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
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
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) |
-
1976
- 1976-12-15 JP JP15406876A patent/JPS5374898A/en active Pending
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