Implementation method and device for calculating sine or cosine function

Abstract

The invention discloses an implementation method and device for calculating a sine or cosine function. The method comprises the steps: S1, enabling an input number to be mapped to a range of [0, pi / 4], and obtaining the function type of internal operation and the sign symbol of a result; S2, obtaining a constant result and a nearest estimation point according to the number mapped to the range of [0, pi / 4] in the S1; S3, obtaining an estimated value of a corresponding sine or cosine function, i.e., a coefficient required by polynomial calculation; S4, obtaining the distance from the number mapped to the range of [0, pi / 4] in the S1 to the nearest estimation point; S5, completing polynomial operation by utilizing the estimated value and the distance from the number mapped to the range of [0,pi / 4] to the nearest estimated point; and S6, selecting the number mapped to the range of [0, pi / 4], a constant result and a polynomial operation result, performing regularization and rounding processing, and performing outputting. The device is used for realizing the method. The method has the advantages of simple principle, high precision, low hardware resource consumption, low calculation delay, relatively small coefficient occupied storage space and the like.

Description

technical field [0001] The present invention mainly relates to the technical field, in particular to an implementation method and device for calculating sine or cosine functions. Background technique [0002] Sine and cosine functions are important components in science, technology and engineering applications. Compared with basic elementary functions, it has the characteristics of relatively complex implementation, large calculation delay, and various implementation methods. To obtain high-precision single-precision floating-point output results that meet the IEEE-754 standard, the cost is relatively higher. In the traditional technology, the main implementation methods include: coordinate rotation method (CORDIC: Coordinate Rotation Digital Computer), look-up table method and polynomial approximation method. Generally speaking, due to the slow convergence of the coordinate rotation method, many iterations are required to achieve high precision, the speed is slow, and the...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that: aiming at the technical problems existing in the prior art, the present invention provides an application with simple principle, high precision, little consumption of hardware resources, low calculation delay, and relatively small storage space occupied by coefficients. Realization method and device for calculating sine or cosine function

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