JPS54104249A - Trigonometric function computer - Google Patents
Trigonometric function computerInfo
- Publication number
- JPS54104249A JPS54104249A JP1039078A JP1039078A JPS54104249A JP S54104249 A JPS54104249 A JP S54104249A JP 1039078 A JP1039078 A JP 1039078A JP 1039078 A JP1039078 A JP 1039078A JP S54104249 A JPS54104249 A JP S54104249A
- Authority
- JP
- Japan
- Prior art keywords
- execution
- register
- trigonometric
- cotangent
- cordic
- 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 eliminate the need of normalization when converting a unit system by shortening the needed time with improved arithmetic accuracy, by introducing CORDIC to the computing principle of a trigonometric-function value of a N-scale computer.
CONSTITUTION: In order to find a cotangent, for example, a desirable value is stored in register X. A table is provided for the operation of CORDIC, its numerals are stored in register Y in sequence, and the execution of X-Y→X is done at every time. The number of times is counted by register Z. When borrowing is required in the execution of X-Y, the execution of X+Y is made. Denoting an angle by θ, Yn/xn is equal logically to tan(θ-Zn) after the execution is done (n) times and Zn approximates to θ as the numeral read out from the table becomes smaller. Other trigonometric-function values can be obtained by transforming the cotangent. Values can be obtained easily by preparing a numeral table as to needed unit systems as a table.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1039078A JPS6029409B2 (en) | 1978-02-03 | 1978-02-03 | Trigonometric function calculation device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1039078A JPS6029409B2 (en) | 1978-02-03 | 1978-02-03 | Trigonometric function calculation device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54104249A true JPS54104249A (en) | 1979-08-16 |
JPS6029409B2 JPS6029409B2 (en) | 1985-07-10 |
Family
ID=11748787
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1039078A Expired JPS6029409B2 (en) | 1978-02-03 | 1978-02-03 | Trigonometric function calculation device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6029409B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4899302A (en) * | 1988-02-17 | 1990-02-06 | Nec Corporation | Arithmetic unit for inverse trigonometric function |
US4956799A (en) * | 1987-06-30 | 1990-09-11 | Nec Corporation | Trigonometric function arithmetic processor using pseudo-division |
EP2275923A2 (en) | 2009-07-03 | 2011-01-19 | Fujitsu Limited | Apparatus and program for arctangent calculation |
-
1978
- 1978-02-03 JP JP1039078A patent/JPS6029409B2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4956799A (en) * | 1987-06-30 | 1990-09-11 | Nec Corporation | Trigonometric function arithmetic processor using pseudo-division |
US4899302A (en) * | 1988-02-17 | 1990-02-06 | Nec Corporation | Arithmetic unit for inverse trigonometric function |
EP2275923A2 (en) | 2009-07-03 | 2011-01-19 | Fujitsu Limited | Apparatus and program for arctangent calculation |
US8549056B2 (en) | 2009-07-03 | 2013-10-01 | Fujitsu Limited | Apparatus and program for arctangent calculation |
Also Published As
Publication number | Publication date |
---|---|
JPS6029409B2 (en) | 1985-07-10 |
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