JPS5667484A - Quantizing circuit - Google Patents
Quantizing circuitInfo
- Publication number
- JPS5667484A JPS5667484A JP14310679A JP14310679A JPS5667484A JP S5667484 A JPS5667484 A JP S5667484A JP 14310679 A JP14310679 A JP 14310679A JP 14310679 A JP14310679 A JP 14310679A JP S5667484 A JPS5667484 A JP S5667484A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- analog
- level
- character
- analog signal
- 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
- Character Input (AREA)
- Manipulation Of Pulses (AREA)
Abstract
PURPOSE: To obtain a quantized signal that is invariably accurate and follows up the change in level of an analog signal of the light and shade of a readout character, by comparing a signal having a white level part limited with an analog signal obtained by a photoelectric converter in OCR.
CONSTITUTION: As photoelectric converter 5 scans characters 2 successively, sample holding circuit 7 outputs analog signal (a) and the output signal of the 1st and 2nd analog switches 8 and 9 turning on-off by turns is analog signal (b) having horizontal synchronizing signal A removed. This signal (b) is passed through level tracking circuit 11, so that output sigal (c) will be clamped at 0v only in the period of the 2nd pulse P2. This clamped signal (c) is supplied to limiter circuit 15 to obtain signal (d) having the white level limited. This signal (d) is compared with analog signal (a) by comparator 14, which outputs binarycoded quantized signal (e). Thus, even if analog signals B2 and B1 of a dark character and light character are inputted, the quantization can be done by following up the change in level with invariable accuracy.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14310679A JPS5667484A (en) | 1979-11-05 | 1979-11-05 | Quantizing circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14310679A JPS5667484A (en) | 1979-11-05 | 1979-11-05 | Quantizing circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5667484A true JPS5667484A (en) | 1981-06-06 |
Family
ID=15331040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14310679A Pending JPS5667484A (en) | 1979-11-05 | 1979-11-05 | Quantizing circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5667484A (en) |
-
1979
- 1979-11-05 JP JP14310679A patent/JPS5667484A/en active Pending
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