Patent ID: 7509363
Filing Date: 2009-03-24
Classification: G06F

Abstract:
1. An apparatus operative to approximate at least one of: a sine and cosine function, the apparatus comprising: a point and slope generator operative to receive data representing an input value including a fixed point input mantissa having a first bit portion and a second bit portion, and in response, to produce data representing at least one point value and at least one slope value based on the first bit portion of the fixed point input mantissa, wherein the data representing the at least one slope value is based on a LaGrange polynomial approximation of the at least one of: the sine and the cosine function; a combiner operatively coupled to the point and slope generator and operative to produce data representing an output mantissa and store the output mantissa in memory in response to the data representing the point value, the at least one slope value and the second bit portion of the fixed point input mantissa; and processing circuitry operative to process the output mantissa value to produce data for display.