JPS5640932A - Function value generator - Google Patents

Function value generator

Info

Publication number
JPS5640932A
JPS5640932A JP11756779A JP11756779A JPS5640932A JP S5640932 A JPS5640932 A JP S5640932A JP 11756779 A JP11756779 A JP 11756779A JP 11756779 A JP11756779 A JP 11756779A JP S5640932 A JPS5640932 A JP S5640932A
Authority
JP
Japan
Prior art keywords
beta
function
function value
alpha
calculates
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
Application number
JP11756779A
Other languages
Japanese (ja)
Other versions
JPS633331B2 (en
Inventor
Yoshihiro Kasuya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11756779A priority Critical patent/JPS5640932A/en
Publication of JPS5640932A publication Critical patent/JPS5640932A/en
Publication of JPS633331B2 publication Critical patent/JPS633331B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/035—Reduction of table size
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2101/00—Indexing scheme relating to the type of digital function generated
    • G06F2101/04—Trigonometric functions

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Complex Calculations (AREA)

Abstract

PURPOSE:To ensure a high-speed generation of the function, by obtaining the desired function value from a small amount of the function value stored and the function value calculated through the function polynomial approximation of a lower order each. CONSTITUTION:For the input signal, the beta is extracted the divider 1 out of theta= alphaN+beta (alpha: constant, N: integer, beta: partial residue of smaller portion than alpha). The partial residue beta is supplied to the function memory device 3 which stores sinalphaN and cosalphaN to N as well as to the arithmetic unit 2 which calculates sinbeta= beta-beta<3>/6+... and cosbeta=1.-beta<3>/2+... each. And the output of the unit 2 is applied to the arithmetic unit 4 which calculates sinalphaNcosbeta+cosalphaNsinbeta. Thus sintheta is obtained at the output 401. As a result, a high-speed generation is possible for the function through a small-capacity memory device.
JP11756779A 1979-09-13 1979-09-13 Function value generator Granted JPS5640932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11756779A JPS5640932A (en) 1979-09-13 1979-09-13 Function value generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11756779A JPS5640932A (en) 1979-09-13 1979-09-13 Function value generator

Publications (2)

Publication Number Publication Date
JPS5640932A true JPS5640932A (en) 1981-04-17
JPS633331B2 JPS633331B2 (en) 1988-01-22

Family

ID=14715003

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11756779A Granted JPS5640932A (en) 1979-09-13 1979-09-13 Function value generator

Country Status (1)

Country Link
JP (1) JPS5640932A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63240626A (en) * 1987-03-27 1988-10-06 Nec Corp Function computing element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4942253A (en) * 1972-03-06 1974-04-20
JPS4977546A (en) * 1972-11-27 1974-07-26
JPS513143A (en) * 1974-06-25 1976-01-12 Nippon Soken

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4942253A (en) * 1972-03-06 1974-04-20
JPS4977546A (en) * 1972-11-27 1974-07-26
JPS513143A (en) * 1974-06-25 1976-01-12 Nippon Soken

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63240626A (en) * 1987-03-27 1988-10-06 Nec Corp Function computing element

Also Published As

Publication number Publication date
JPS633331B2 (en) 1988-01-22

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