Sin/cos generator implementation

Details Sin/cos generator implementation Sin/cos generator implementation

1990-08-02

1992-05-12

Malzahn, David H.

Boots, shoes, and leggings

G06F 102

Patent

active

051133610

ABSTRACT:
A sin/cos generator which stores values for sin X and cos X, multiplies the sin X and cos X by the value sin Y to produce partial products -sin Y sin X and sin Y cos X and adds the partial products sin Y cos X to sin X to produce sin (X+Y) and adds the partial products -sin Y sin X to cos X to produce cos (X+Y). The values of sin X and cos X are stored for a single quadrant without sign designation and quadrant control is provided to complement the appropriate values of sin X and cos X before adding and multiplying. The complementing forms the one's complement and adds a 1 in the least significant bit to form the two's complement.

REFERENCES:
patent: 3813528 (1974-05-01), Blanding
patent: 4077063 (1978-02-01), Lind
patent: 4159526 (1979-06-01), Mosley, Jr. et al.
patent: 4172286 (1979-10-01), Wess
patent: 4342245 (1982-08-01), Gross
patent: 4346448 (1982-08-01), Insam et al.
patent: 4486846 (1984-12-01), McCallister et al.
patent: 4888719 (1989-12-01), Yassa

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