JPS5586232A - Analog light communication unit - Google Patents
Analog light communication unitInfo
- Publication number
- JPS5586232A JPS5586232A JP16370978A JP16370978A JPS5586232A JP S5586232 A JPS5586232 A JP S5586232A JP 16370978 A JP16370978 A JP 16370978A JP 16370978 A JP16370978 A JP 16370978A JP S5586232 A JPS5586232 A JP S5586232A
- Authority
- JP
- Japan
- Prior art keywords
- photo
- pulse
- polarity
- positive
- output
- 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
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Dc Digital Transmission (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To carry out secure photo transmission of an analog signal by sending photo signals of a fixed level, more than the fixed level and zero level from a transmission part in respond to outputs of an operational amplifier and then by detecting them by a reception part to generate analog signals. CONSTITUTION:In a transmission part, negative-polarity pulse generator 12 generates a negative-polarity pulse of amplitude and pulse width equal to a positive- polarity pulse right after the positive-polarity pulse outputted by a voltage-frequency converter. Then, operational amplifier 15 mixes respective pulses outputted by generator 12 to obtain the pattern of a composite pulse of multi-polarity and LED17 obtains outputs of a fixed level, more than it and zero level according to the zero, positive and negative polarities of the output of circuit 15. In a reception part, photo detecting element 51' receives a transmitted photo signal and comparator 53' detects via an AC coupling method the output of element 51' to convert its output into an analog electric signal through frequency-voltage conversion. Consequently, secure photo transmission of the analog signal can be done.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16370978A JPS5586232A (en) | 1978-12-23 | 1978-12-23 | Analog light communication unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16370978A JPS5586232A (en) | 1978-12-23 | 1978-12-23 | Analog light communication unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5586232A true JPS5586232A (en) | 1980-06-28 |
Family
ID=15779135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16370978A Pending JPS5586232A (en) | 1978-12-23 | 1978-12-23 | Analog light communication unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5586232A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58143658A (en) * | 1982-02-19 | 1983-08-26 | Hitachi Cable Ltd | Data transmitting system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4945674A (en) * | 1972-09-01 | 1974-05-01 | ||
JPS4994308A (en) * | 1973-01-11 | 1974-09-07 | ||
JPS5098204A (en) * | 1973-12-26 | 1975-08-05 | ||
JPS5226108A (en) * | 1975-08-25 | 1977-02-26 | Tamura Electric Works Ltd | Data transmission system |
-
1978
- 1978-12-23 JP JP16370978A patent/JPS5586232A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4945674A (en) * | 1972-09-01 | 1974-05-01 | ||
JPS4994308A (en) * | 1973-01-11 | 1974-09-07 | ||
JPS5098204A (en) * | 1973-12-26 | 1975-08-05 | ||
JPS5226108A (en) * | 1975-08-25 | 1977-02-26 | Tamura Electric Works Ltd | Data transmission system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58143658A (en) * | 1982-02-19 | 1983-08-26 | Hitachi Cable Ltd | Data transmitting system |
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