JPS54158154A - Method and apparatus for analog-digiral conversion - Google Patents
Method and apparatus for analog-digiral conversionInfo
- Publication number
- JPS54158154A JPS54158154A JP6705378A JP6705378A JPS54158154A JP S54158154 A JPS54158154 A JP S54158154A JP 6705378 A JP6705378 A JP 6705378A JP 6705378 A JP6705378 A JP 6705378A JP S54158154 A JPS54158154 A JP S54158154A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- duty ratio
- analog signal
- conversion
- wave
- 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
Abstract
PURPOSE: To enable the A/D conversion as well as to minimize the number of the input and output lines by using the program-type control unit which can control the duty ratio of the analog signal and then the average value.
CONSTITUTION: Analog signal B is obtained by smoothing rectangular wave A via integrating circuit 14. Accordingly, if the duty ratio of wave A is varied, analog signal B changes in proportion to the duty ratio. Here, a certain data is supposed based on the order of program memory 3, and both addition and subtraction are given to the signal of logic "1" which is delivered to circuit 14 from accumulator 9. As a result, the signal the duty ratio of which is made to correspond to a certain data is obtained. A comparison is given at comparator 12 to the average value between input analog signal 13 and the signal of wave A obtained through circuit 14, and the comparison signal C is increased and decreased repetitively with the value nearest signal 13. Under such conditions, the data judged at program-type control unit 1 i features the result of the A/D conversion, thus completing the A/D convension.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6705378A JPS54158154A (en) | 1978-06-02 | 1978-06-02 | Method and apparatus for analog-digiral conversion |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6705378A JPS54158154A (en) | 1978-06-02 | 1978-06-02 | Method and apparatus for analog-digiral conversion |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54158154A true JPS54158154A (en) | 1979-12-13 |
Family
ID=13333702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6705378A Pending JPS54158154A (en) | 1978-06-02 | 1978-06-02 | Method and apparatus for analog-digiral conversion |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54158154A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5689127A (en) * | 1979-12-21 | 1981-07-20 | Canon Inc | A/d converter |
-
1978
- 1978-06-02 JP JP6705378A patent/JPS54158154A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5689127A (en) * | 1979-12-21 | 1981-07-20 | Canon Inc | A/d converter |
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