JPS5484909A - Signal detection system - Google Patents
Signal detection systemInfo
- Publication number
- JPS5484909A JPS5484909A JP14886077A JP14886077A JPS5484909A JP S5484909 A JPS5484909 A JP S5484909A JP 14886077 A JP14886077 A JP 14886077A JP 14886077 A JP14886077 A JP 14886077A JP S5484909 A JPS5484909 A JP S5484909A
- Authority
- JP
- Japan
- Prior art keywords
- main line
- loop
- ringing
- signal
- detection
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/02—Calling substations, e.g. by ringing
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
PURPOSE:To reduce the number of components and to make small and integrate the system, by detecting the ringing signal and loop with the DC blocking capacitor and detection element in the main line trunk. CONSTITUTION:When relay contacts r1 to r3 are not operative, the ringing signal from the main line is detected with the ringing detection circuit consisting of the Dc blocking capacitor 11, resistor 12, detection elements 13 and 14, the detected output is delivered to the processor. Further, the signal is unnecessary on exchanger operation, then the loop detection circuit is formed with the choke coil 15 and detection elements 13 and 14 with the operation of contacts r1 to r3, and loop switching is sdetected with the current from the main line.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14886077A JPS5484909A (en) | 1977-12-13 | 1977-12-13 | Signal detection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14886077A JPS5484909A (en) | 1977-12-13 | 1977-12-13 | Signal detection system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5484909A true JPS5484909A (en) | 1979-07-06 |
JPS573273B2 JPS573273B2 (en) | 1982-01-20 |
Family
ID=15462351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14886077A Granted JPS5484909A (en) | 1977-12-13 | 1977-12-13 | Signal detection system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5484909A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59120034U (en) * | 1983-02-02 | 1984-08-13 | 株式会社小松製作所 | Blank material supply device |
JPS61150394U (en) * | 1985-03-08 | 1986-09-17 | ||
JPS61155889U (en) * | 1985-03-18 | 1986-09-27 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52130221A (en) * | 1976-04-24 | 1977-11-01 | Fujitsu Ltd | Ringing detection circuit in telephone exchanger |
-
1977
- 1977-12-13 JP JP14886077A patent/JPS5484909A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52130221A (en) * | 1976-04-24 | 1977-11-01 | Fujitsu Ltd | Ringing detection circuit in telephone exchanger |
Also Published As
Publication number | Publication date |
---|---|
JPS573273B2 (en) | 1982-01-20 |
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