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热词
    • 2. 发明授权
    • Apparatus and method useful for evaluating periodic functions
    • 用于评估周期性功能的装置和方法
    • US6141670A
    • 2000-10-31
    • US941359
    • 1997-09-30
    • Shane A. StoryPing Tak Peter Tang
    • Shane A. StoryPing Tak Peter Tang
    • G06F7/548G06F1/02G06F7/38
    • G06F7/548
    • A computer and a method of using the computer to reduce an original argument to obtain a periodic function of the argument. A special number P.sub.j is employed that is close to a nontrivial even-integral multiple .pi.. The technique subtracts a non-negative integral multiple of P.sub.j from the original argument to obtain a first reduced argument. Then, a second non-negative integer multiple of a floating-point representation of .pi./2 is subtracted from the first reduced argument to obtain a second reduced argument. Next, a periodic function of a third argument equal to a sum of the second reduced argument plus the product of the first non-negative integral multiple and a floating-point representation of an offset .delta..sub.j is evaluated to obtain a result.
    • 计算机和使用计算机来减少原始参数以获得参数的周期性函数的方法。 采用特殊数字Pj,其接近非平凡的均匀多重pi。 该技术从原始参数中减去Pj的非负整数倍以获得第一个简化参数。 然后,从第一个缩减参数中减去+ E的浮点表示的第二个非负整数倍,得到第二个缩减参数。 接下来,评估等于第二缩减参数加上第一非负整数倍的乘积和偏移量Δj的浮点表示的乘积的第三参数的周期函数,以获得结果。