JPS55124845A - Digital multiplier - Google Patents
Digital multiplierInfo
- Publication number
- JPS55124845A JPS55124845A JP3367279A JP3367279A JPS55124845A JP S55124845 A JPS55124845 A JP S55124845A JP 3367279 A JP3367279 A JP 3367279A JP 3367279 A JP3367279 A JP 3367279A JP S55124845 A JPS55124845 A JP S55124845A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- multiplier
- product
- output
- multiplicand
- 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 reduce the capacity of ROM in the digital multiplier using read-only memory (ROM) as the circuit in which the result of square is picked up at the output to the address value written in advance.
CONSTITUTION: The product AB is obtained from equation (1), by taking A as multiplier and B as multiplicand. The multiplier A and multiplicand B are inputted respectively from the input terminals 8 and 9, and A+B is obtained at the addition circuit 1 and A-B is obtained at subtraction circuit 2. Division is made by 2, the least significant bit LSD is omitted, the output is inputted to the square tables 3, 4 consisting of ROM through address to obtain the square value as the output. Subtraction is made at the next subtraction circuit and the product AB is obtained at the product output terminal 10. When the numbers A, B are both an even or odd number, correct value can be obtained. But if different, error can be produced. Discrimination is made at the selection circuit 6 to discriminate the greatness of multiplier and multiplicand, smaller number is fed to the addition circuit 7, it is added with the result of the subtraction circuit 5 for correct product.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3367279A JPS55124845A (en) | 1979-03-22 | 1979-03-22 | Digital multiplier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3367279A JPS55124845A (en) | 1979-03-22 | 1979-03-22 | Digital multiplier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55124845A true JPS55124845A (en) | 1980-09-26 |
Family
ID=12392937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3367279A Pending JPS55124845A (en) | 1979-03-22 | 1979-03-22 | Digital multiplier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55124845A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4752731A (en) * | 1985-06-14 | 1988-06-21 | Mitsubishi Denki Kabushiki Kaisha | Electronic type electric energy meter |
-
1979
- 1979-03-22 JP JP3367279A patent/JPS55124845A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4752731A (en) * | 1985-06-14 | 1988-06-21 | Mitsubishi Denki Kabushiki Kaisha | Electronic type electric energy meter |
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