Elementary function arithmetic unit

Details Elementary function arithmetic unit Elementary function arithmetic unit

1987-09-09

1989-12-19

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 738

Patent

active

048887218

ABSTRACT:
A function arithmetic unit which performs elementary operations at high speeds and which enables required memory capacity to be reduced. The function arithmetic unit includes a constant memory which stores a constant that corresponds to the number of successive iterative operations; a controller which causes addition or subtraction in the successive iterative operations; and arithmetic units which receive, as initial values, an argument of an elementary function value to be found and two constants determined depending upon the elementary functions to be found, and which subject these initial values to n iterative operations to produce elementary function values. A further arithmetic unit subjects the elementary function values to multiplication, addition, subtraction, or division, or a combination thereof, thereby to produce the thus obtained value.

REFERENCES:
patent: 4231102 (1980-10-01), Barr et al.
patent: 4338675 (1982-07-01), Palmer et al.
patent: 4484259 (1984-11-01), Palmer et al.
Volder, "The Cordic Trigonometric Computing Technique", IRE Trans. on Elect. Computers, vol. EC-B, Sep. 1959, pp. 330-334.
Despain, "Fourier Transform Computers Using Cordic Iterations", IEEE Trans. on Computers, vol. C-23, No. 10, Oct. 1974, pp. 993-1001.

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