JPS62178630U - - Google Patents
Info
- Publication number
- JPS62178630U JPS62178630U JP6802386U JP6802386U JPS62178630U JP S62178630 U JPS62178630 U JP S62178630U JP 6802386 U JP6802386 U JP 6802386U JP 6802386 U JP6802386 U JP 6802386U JP S62178630 U JPS62178630 U JP S62178630U
- Authority
- JP
- Japan
- Prior art keywords
- analog
- digital
- signal
- reference voltage
- selecting
- 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
- Analogue/Digital Conversion (AREA)
Description
第１図は本考案に係る一実施例を示すブロツク
構成図、第２図はイメージスキヤナに用いられて
いるＣＣＤより出力される画素信号を示す図、第
３図はセンサーユニツトと読取面との関係を示す
図、第４図は従来のイメージスキヤナのシエーデ
イング補正に用いられるアナログ／デイジタル変
換回路を示す図である。
１１……アナログ／デイジタル変換部、１３…
…スイツチ切替回路、１４，１５……アナログス
イツチユニツト、１５ｂ，１６……デコーダ、１
７……抵抗網、１８，１９，２０，２１，２２，
２３……定電圧源。
Fig. 1 is a block configuration diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing pixel signals output from a CCD used in an image scanner, and Fig. 3 shows a sensor unit and a reading surface. FIG. 4 is a diagram showing an analog/digital conversion circuit used for shading correction in a conventional image scanner. 11...Analog/digital conversion section, 13...
...Switch switching circuit, 14, 15... Analog switch unit, 15b, 16... Decoder, 1
7...Resistance network, 18, 19, 20, 21, 22,
23... Constant voltage source.
Claims (1)
号に変換するアナログ／デイジタル変換装置にお
いて、複数の基準電圧を発生する基準電圧発生手
段と、入力信号に応じて前記複数の基準電圧の内
の１つを選択する選択手段と、前記選択手段によ
つて選択された基準電圧を用いて前記入力信号を
デイジタル信号に変換するアナログ／デイジタル
変換部とを具備してなるアナログ／デイジタル変
換装置。 An analog/digital converter that converts an analog signal into a digital signal using a reference voltage, comprising a reference voltage generating means for generating a plurality of reference voltages, and selecting one of the plurality of reference voltages according to an input signal. An analog/digital conversion device comprising: a selection means for selecting a digital signal; and an analog/digital conversion section for converting the input signal into a digital signal using a reference voltage selected by the selection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6802386U JPS62178630U (en) | 1986-05-06 | 1986-05-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6802386U JPS62178630U (en) | 1986-05-06 | 1986-05-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62178630U true JPS62178630U (en) | 1987-11-13 |
Family
ID=30907461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6802386U Pending JPS62178630U (en) | 1986-05-06 | 1986-05-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62178630U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5617733B2 (en) * | 1975-06-24 | 1981-04-24 | ||
| JPS56168427A (en) * | 1980-05-28 | 1981-12-24 | Ricoh Co Ltd | Analog-to-digital converter |
-
1986
- 1986-05-06 JP JP6802386U patent/JPS62178630U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5617733B2 (en) * | 1975-06-24 | 1981-04-24 | ||
| JPS56168427A (en) * | 1980-05-28 | 1981-12-24 | Ricoh Co Ltd | Analog-to-digital converter |