JPS5799837A - Error signal detecting circuit - Google Patents
Error signal detecting circuitInfo
- Publication number
- JPS5799837A JPS5799837A JP55176229A JP17622980A JPS5799837A JP S5799837 A JPS5799837 A JP S5799837A JP 55176229 A JP55176229 A JP 55176229A JP 17622980 A JP17622980 A JP 17622980A JP S5799837 A JPS5799837 A JP S5799837A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- input
- counter
- circuit
- period
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Dc Digital Transmission (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To raise the error signal detecting capacity, by counting a pulse of an input signal per unit time, and operating a signal demodulating circuit when the input signal has entered the prescribed range continuously by the prescribed number of times. CONSTITUTION:An optical input is converted to an electric signal by a photoelectric converting part 10 and is inputted to a signal counter 13. By a reference counter 11 and a decoder 12, a reference signal is generated from a reference clock having a period T, and a clear signal and a check timing signal are generated when a counting value is ''0'', and when the counting value is N, respectively. The counter 13 sets an FF14 when an input pulse has been counted by (m) piece, resets the FF14 and also sets an FF15 when the clear signal is ''1'', and resets the FF15 when it has been counted by (n)(>m) pieces. When a period of the input signal is denoted as (t), an FF17 is set at the time of a range of mt<NT<nt. When an output of the FF17 is logic ''1'' during the period exceeding a time constant of a time constant circuit 18 continuously, an FF20 is set, a signal demodulating circuit 21 is operated, and if said output has slipped out of the prescribed range even once, the FF20 is reset, and the circuit 21 is not operated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55176229A JPS5799837A (en) | 1980-12-13 | 1980-12-13 | Error signal detecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55176229A JPS5799837A (en) | 1980-12-13 | 1980-12-13 | Error signal detecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5799837A true JPS5799837A (en) | 1982-06-21 |
Family
ID=16009883
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55176229A Pending JPS5799837A (en) | 1980-12-13 | 1980-12-13 | Error signal detecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5799837A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59144230A (en) * | 1983-02-07 | 1984-08-18 | Chino Works Ltd | Output device |
JPH1127309A (en) * | 1997-07-04 | 1999-01-29 | Meidensha Corp | Optical repeater |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51138112A (en) * | 1975-05-24 | 1976-11-29 | Koden Electronics Co Ltd | Signal detecting device |
-
1980
- 1980-12-13 JP JP55176229A patent/JPS5799837A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51138112A (en) * | 1975-05-24 | 1976-11-29 | Koden Electronics Co Ltd | Signal detecting device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59144230A (en) * | 1983-02-07 | 1984-08-18 | Chino Works Ltd | Output device |
JPH1127309A (en) * | 1997-07-04 | 1999-01-29 | Meidensha Corp | Optical repeater |
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