JPS56122592A - Scanning system - Google Patents
Scanning systemInfo
- Publication number
- JPS56122592A JPS56122592A JP2633280A JP2633280A JPS56122592A JP S56122592 A JPS56122592 A JP S56122592A JP 2633280 A JP2633280 A JP 2633280A JP 2633280 A JP2633280 A JP 2633280A JP S56122592 A JPS56122592 A JP S56122592A
- Authority
- JP
- Japan
- Prior art keywords
- line
- monitor
- filters
- points
- appears
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/72—Finding out and indicating number of calling subscriber
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
PURPOSE:To miniature a scanning device which has lines of a telephone switchboard and monitor points for every line, by decreasing the number of filters by processing previous information between the assignment of a line and the collection of information on monitor points. CONSTITUTION:When driving line ROW0 is assigned and changes in state at monitor points a00-a0m of the line are to be detected, a positive pulse appears like driving ROW0 once the line is assigned. The pulse appears at filters FIL0-FILm provided corresponding to the monitor points. Through the filters, time limitation for noise absorption in carried out and their outputs appear at sense amplifiers SA0-SAm, but, for example, when monitor point a00 is in operation, the positive pulse flows to the ground and appears at neither filter FIL0 nor sense amplifier SA0, so that sense amplifier SA0 will detect monitor point a00 being in operation. Thus, filters are only provided as many as sense amplifiers because monitor information read between line assignment and detecting-reading operation is processed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2633280A JPS56122592A (en) | 1980-03-03 | 1980-03-03 | Scanning system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2633280A JPS56122592A (en) | 1980-03-03 | 1980-03-03 | Scanning system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56122592A true JPS56122592A (en) | 1981-09-26 |
Family
ID=12190463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2633280A Pending JPS56122592A (en) | 1980-03-03 | 1980-03-03 | Scanning system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56122592A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5345908A (en) * | 1976-10-07 | 1978-04-25 | Fujitsu Ltd | Subscriber scanning system |
-
1980
- 1980-03-03 JP JP2633280A patent/JPS56122592A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5345908A (en) * | 1976-10-07 | 1978-04-25 | Fujitsu Ltd | Subscriber scanning system |
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