JPS555582A - Signal processing system for optical detector - Google Patents
Signal processing system for optical detectorInfo
- Publication number
- JPS555582A JPS555582A JP7955278A JP7955278A JPS555582A JP S555582 A JPS555582 A JP S555582A JP 7955278 A JP7955278 A JP 7955278A JP 7955278 A JP7955278 A JP 7955278A JP S555582 A JPS555582 A JP S555582A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- white
- level
- video signal
- black level
- 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
Landscapes
- Facsimile Image Signal Circuits (AREA)
- Manipulation Of Pulses (AREA)
Abstract
PURPOSE: To perform correct A/D conversion sufficiently following the change in the absolute black level of video signal, by setting the reference level signal to digitize the video signal from pick up elements in response to the white and black both levels.
CONSTITUTION: The video signal 1 in photo electric conversion from the pick up element is branched into two signals, which are respectively fed to the reference signal generating circuit 2 for white level follower and the circuit 3 for black level. The circuit 2 follows the white level, that is the peak value of video signal depending on the time constant determined with the charge and discharge circuit 21, and since the circuit 3 is inputted to the charge and discharge circuit 32 via the inversion circuit 31, it follows the peak value at polarity conversion, i.e., black level. By dividing the reference signal following to the white and black level thus obtained at the division circuit 4, the signals from white to black level, e.g., signals A0 to A15 of 16 steps can be obtained, and correct A/D conversion can be made based on it.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7955278A JPS555582A (en) | 1978-06-29 | 1978-06-29 | Signal processing system for optical detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7955278A JPS555582A (en) | 1978-06-29 | 1978-06-29 | Signal processing system for optical detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS555582A true JPS555582A (en) | 1980-01-16 |
Family
ID=13693164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7955278A Pending JPS555582A (en) | 1978-06-29 | 1978-06-29 | Signal processing system for optical detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS555582A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5302814A (en) * | 1990-06-18 | 1994-04-12 | Fujitsu Limited | Bar code reading apparatus |
-
1978
- 1978-06-29 JP JP7955278A patent/JPS555582A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5302814A (en) * | 1990-06-18 | 1994-04-12 | Fujitsu Limited | Bar code reading apparatus |
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