JPS567557A - Automatic gain control circuit - Google Patents
Automatic gain control circuitInfo
- Publication number
- JPS567557A JPS567557A JP8202079A JP8202079A JPS567557A JP S567557 A JPS567557 A JP S567557A JP 8202079 A JP8202079 A JP 8202079A JP 8202079 A JP8202079 A JP 8202079A JP S567557 A JPS567557 A JP S567557A
- Authority
- JP
- Japan
- Prior art keywords
- joints
- level
- sections
- original
- amplifiers
- 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
- 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
- H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Of Amplification And Gain Control (AREA)
- Facsimile Heads (AREA)
Abstract
PURPOSE:To realize the good level control operation, by easily removing the level difference at the joints of original, through the level control at the sections corresponding to the joints of original to be transmitted by means of the output signal of the image sensor. CONSTITUTION:At the part corresponding to the joints of original to be transmitted, the waveform of the output signals (a), (b) of the image sensors 4, 5 is similar. In amplifying the signals (a) and (b) at the variable gain amplifiers 11, 15, the gain of the amplifiers 11, 15 is controlled at the level control units 12, 14 so that the signal level at the sections corresponding to the joints can be of the same level. At the sections not corresponding to the joints, the control units 12, 14 are controlled so that the gain of the amplifiers 11, 15 obtained at the sections corresponding to the joints can be stored. The joint detector 13 identifies the sections corresponding to and not corresponding to the joints for the signals (a) and (b) and informs it to the control units 12 and 14.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8202079A JPS567557A (en) | 1979-06-30 | 1979-06-30 | Automatic gain control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8202079A JPS567557A (en) | 1979-06-30 | 1979-06-30 | Automatic gain control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS567557A true JPS567557A (en) | 1981-01-26 |
Family
ID=13762831
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8202079A Pending JPS567557A (en) | 1979-06-30 | 1979-06-30 | Automatic gain control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS567557A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0144089A2 (en) * | 1983-12-01 | 1985-06-12 | Fuji Photo Film Co., Ltd. | Light detecting apparatus |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5322310A (en) * | 1976-08-13 | 1978-03-01 | Toshiba Corp | Picture read system |
-
1979
- 1979-06-30 JP JP8202079A patent/JPS567557A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5322310A (en) * | 1976-08-13 | 1978-03-01 | Toshiba Corp | Picture read system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0144089A2 (en) * | 1983-12-01 | 1985-06-12 | Fuji Photo Film Co., Ltd. | Light detecting apparatus |
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