JPS5738064A - Video reader - Google Patents
Video readerInfo
- Publication number
- JPS5738064A JPS5738064A JP11449980A JP11449980A JPS5738064A JP S5738064 A JPS5738064 A JP S5738064A JP 11449980 A JP11449980 A JP 11449980A JP 11449980 A JP11449980 A JP 11449980A JP S5738064 A JPS5738064 A JP S5738064A
- Authority
- JP
- Japan
- Prior art keywords
- output
- amplifier
- voltage
- image sensor
- capacitor
- 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
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
- H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To compensate an offset voltage, by picking up an output of a differetial amplifier amplifying the output of a solidstate image sensor during the nonsignal period of the image sensor and feeding back the output to the differential amplifier via an amplifying circuit and a volage storage circuit. CONSTITUTION:During nonsignal period in which a solidstate image sensor 3 does not transmit an original video signal d for one line's share of main scanning, a section display signal f of a control circuit 2 transmitting a video signal transmission start signal b to the image sensor 3 turns on a switch 5, then the output h of an operaional amplifier 9 inputting the output of a differential amplifer 7 charges up a capacitor C2. An operational amplifier 12 amplifies a voltage of the C2 and the output holds a capacitor C3 of a voltage storage circuit 13 at a voltage k and it is inputted to the plus side of the amplifier 7. On the other hand, during the transmission of a video signal d, the switch 5 is turned and the voltage k is held since the value of the capacitor C3 and the resistor 9 is made larger. Thus, an output always constant is fed back to the amplifier 7, the offset voltage can be compensated automatically.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11449980A JPS5738064A (en) | 1980-08-19 | 1980-08-19 | Video reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11449980A JPS5738064A (en) | 1980-08-19 | 1980-08-19 | Video reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5738064A true JPS5738064A (en) | 1982-03-02 |
JPS6226630B2 JPS6226630B2 (en) | 1987-06-10 |
Family
ID=14639277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11449980A Granted JPS5738064A (en) | 1980-08-19 | 1980-08-19 | Video reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5738064A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03153145A (en) * | 1989-11-10 | 1991-07-01 | Nec Corp | Carrier recovery system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51105712A (en) * | 1975-03-14 | 1976-09-18 | Yokogawa Electric Works Ltd | 2 chishingohenkankairo |
JPS5383515A (en) * | 1976-12-29 | 1978-07-24 | Fujitsu Ltd | Quantization circuit for picture signal |
JPS53113487A (en) * | 1977-03-15 | 1978-10-03 | Teii Deii Kei Fueachiyairudo K | Method of deleting dark current of charge transfer element |
-
1980
- 1980-08-19 JP JP11449980A patent/JPS5738064A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51105712A (en) * | 1975-03-14 | 1976-09-18 | Yokogawa Electric Works Ltd | 2 chishingohenkankairo |
JPS5383515A (en) * | 1976-12-29 | 1978-07-24 | Fujitsu Ltd | Quantization circuit for picture signal |
JPS53113487A (en) * | 1977-03-15 | 1978-10-03 | Teii Deii Kei Fueachiyairudo K | Method of deleting dark current of charge transfer element |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03153145A (en) * | 1989-11-10 | 1991-07-01 | Nec Corp | Carrier recovery system |
Also Published As
Publication number | Publication date |
---|---|
JPS6226630B2 (en) | 1987-06-10 |
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