Method and apparatus for generating trigonometric results
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United States of America Patent
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-
Jan 3, 2012
Grant Date -
Jul 31, 2008
app pub date -
Jan 29, 2007
filing date -
Jan 29, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method, computer-readable medium, and apparatus for generating a trigonometric value. The method includes receiving a request to calculate a trigonometric value for an angle value and calculating a fractional value from the angle value. The fractional value corresponds to one of a first quadrant value, a second quadrant value, a third quadrant value, and a fourth quadrant value. The method also includes using the fractional value to determine whether to perform at least one of inverting the fractional value and negating the trigonometric value. The method further includes generating the trigonometric value from the fractional value by adding at least a portion of the fractional value with at least one of a shifted fractional value produced by shifting the portion of the fractional value and a constant value and providing the trigonometric value in response to the request.
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