JPS5515524A - Digital arithmetic circuit - Google Patents
Digital arithmetic circuitInfo
- Publication number
- JPS5515524A JPS5515524A JP8737878A JP8737878A JPS5515524A JP S5515524 A JPS5515524 A JP S5515524A JP 8737878 A JP8737878 A JP 8737878A JP 8737878 A JP8737878 A JP 8737878A JP S5515524 A JPS5515524 A JP S5515524A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- encoder
- output
- addition
- digital input
- 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.)
- Granted
Links
Landscapes
- Complex Calculations (AREA)
Abstract
PURPOSE: To make it possible to execute multiplication and addition in a nearly- equal processing time, by substituting the multiplication, requiring large hardware and a longer arithmetic time in comparison with addition, by addition using logarithms.
CONSTITUTION: The circuit consits of priority encoder 1 which outputs X with the value of a digital input over 2X to 2X+1, priority encoder 1 which outputs X, decoder 2 which expands its output from X, and circuit 3 which obtains OR an'.an-1 of the product as to the same (i) [positive integer] of AND an'.an-1 between the "n"-th output an' of decoder 2 and the "n-1"-th input an-1 of encoder 1. Then, the output of encoder 1 is sent out as the index of the logarithm of the digital input, and that of circuit 3 is as a value of 2-1 digits of the mantissa of the logarithm of the digital input.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8737878A JPS5913782B2 (en) | 1978-07-17 | 1978-07-17 | digital arithmetic circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8737878A JPS5913782B2 (en) | 1978-07-17 | 1978-07-17 | digital arithmetic circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5515524A true JPS5515524A (en) | 1980-02-02 |
JPS5913782B2 JPS5913782B2 (en) | 1984-03-31 |
Family
ID=13913226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8737878A Expired JPS5913782B2 (en) | 1978-07-17 | 1978-07-17 | digital arithmetic circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5913782B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63271150A (en) * | 1987-04-28 | 1988-11-09 | Osaka Gas Co Ltd | Contact combustion type gaseous carbon monoxide sensor |
EP0301334A2 (en) * | 1987-07-30 | 1989-02-01 | International Business Machines Corporation | Hardware device to assist adaptive reordering of sequential decisions |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0579172U (en) * | 1992-03-31 | 1993-10-26 | 日本鋼管継手株式会社 | Flange pipe fitting |
-
1978
- 1978-07-17 JP JP8737878A patent/JPS5913782B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63271150A (en) * | 1987-04-28 | 1988-11-09 | Osaka Gas Co Ltd | Contact combustion type gaseous carbon monoxide sensor |
JPH0473744B2 (en) * | 1987-04-28 | 1992-11-24 | ||
EP0301334A2 (en) * | 1987-07-30 | 1989-02-01 | International Business Machines Corporation | Hardware device to assist adaptive reordering of sequential decisions |
Also Published As
Publication number | Publication date |
---|---|
JPS5913782B2 (en) | 1984-03-31 |
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