Trigonometric function preprocessing system

Details Trigonometric function preprocessing system Trigonometric function preprocessing system

1988-01-28

1989-09-26

Harkcom, Gary V.

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364729, G06F 102

Patent

active

048706060

ABSTRACT:
A trigonometric function preprocessing system used for calculating a value of a given trigonometric function of a given numerical data, including a dividend register coupled to store the given numerical data as a dividend; a divisor register coupled store a divisor; and an arithmetic divider having a pair of inputs coupled to the dividend and divisor registers for generating a quotient and a remainder. A quotient register is coupled to store the quotient and first, second and third flags are provided to be coupled to the quotient register so as to store three least significant bits of the quotient. Further, a fourth flag is provided for storing information indicative of a sign of the given numerical data. A first logic circuit is coupled to at least two of the first to fourth flags for determining a sign of an output value of the given trigonometric function. A second logic circuit is coupled to at least two of the first to third flags for selecting one of a sine function and a cosine function to be executed.

REFERENCES:
patent: 3735110 (1973-05-01), LeComte
patent: 3813528 (1974-05-01), Blanding

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