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公开(公告)号：US5553012A
公开(公告)日：1996-09-03
申请号：US401515
申请日：1995-03-10
申请人： John M. Buss , James D. Dworkin , Scott E. Lloyd , Shao W. Pan , Stephen L. Smith , Shay-Ping T. Wang
发明人： John M. Buss , James D. Dworkin , Scott E. Lloyd , Shao W. Pan , Stephen L. Smith , Shay-Ping T. Wang
CPC分类号： G06F7/556
摘要： A circuit and method for computing an exponential signal x.sup.g is provided. The circuit includes a logarithm converter which converts an input signal to binary word that represents the logarithm of an input signal x. A first shift register shifts the binary word in a bit-wise fashion to produce a first intermediate value; while a second shift register shifts the binary word in a bit-wise fashion to produce a second intermediate value. The shift registers may be implemented using multiplexers. The shifting operations are equivalent to multiplying the intermediate values by a factor which is a power of two. The first intermediate value is either added to or subtracted from the second intermediate value to produce a combined value. An inverse-logarithm converter converts the combined value to the exponential signal.
摘要翻译： 提供了一种用于计算指数信号xg的电路和方法。 该电路包括将输入信号转换为表示输入信号x的对数的二进制字的对数转换器。 第一移位寄存器以逐位方式移位二进制字以产生第一中间值; 而第二移位寄存器以逐位方式移位二进制字以产生第二中间值。 移位寄存器可以使用多路复用器来实现。 移位操作等效于将中间值乘以2的幂。 将第一中间值添加到第二中间值或从第二中间值中减去以产生组合值。 反向对数转换器将组合值转换为指数信号。
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2.发明授权Logarithm/inverse-logarithm converter utilizing a truncated Taylor series and method of use thereof 失效利用截断泰勒级数的对数/反对数转换器及其使用方法
公开(公告)号：US5604691A
公开(公告)日：1997-02-18
申请号：US381167
申请日：1995-01-31
申请人： James D. Dworkin , John M. Buss
发明人： James D. Dworkin , John M. Buss
CPC分类号： G06F7/556 , G06F1/0307 , H03M7/50
摘要： A converter which may be used for implementing either logarithmic or inverse-logarithmic functions is disclosed. The converter includes a memory, two multiplier, and two adders. The memory stores a plurality of coefficient which are based on a second-order Taylor polynomial used to estimate a logarithmic or inverse-logarithmic function over a domain of input values. A method of using the converter is also disclosed.
摘要翻译： 公开了可用于实现对数或反对数函数的转换器。 该转换器包括一个存储器，两个乘法器和两个加法器。 存储器存储基于用于估计输入值的域上的对数或反对数函数的二阶泰勒多项式的多个系数。 还公开了一种使用该转换器的方法。
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