公开(公告)号：EP0264256A2

公开(公告)日：1988-04-20

申请号：EP87309031.0

申请日：1987-10-13

申请人： RAYTHEON COMPANY

发明人： Jagodnik, Anthony J., Jr. ,  Evett, Ronald C.

IPC分类号： G06F15/347

CPC分类号： G06F7/4806 ,  G06F7/552 ,  G06F2207/5525

摘要： This vector magnitude approximating method uses logarithms of vector's orthogonal components to select multiplier scaling constants (K x ,K y ) and to minimize arithmetic-function and hardware complexity. The vector magnitude is approximated by multiplying (20,22) each component (X,Y) of a complex number representing the vector by selected scaling constants (K x ,K y ) and then by summing (24) the two resulting products (K x X,K y Y). The scaling constants (K x ,K y ) are selected by feeding each orthogonal component (X,Y) into one of two identical logic arrays (10,12) which determine the base-2 logarithm of the absolute value of each component. The resulting logarithm values are fed, in parallel, into a third logic array (14) which outputs an address to real and imaginary constant read-only memory generators (16,18) for providing respective scaling constant pairs (K x ,K y ) which are used in computing the approximate magnitude of the vector or complex number. The apparatus is particularly applicable to a high-throughput, pipelined, digital signal processing application such as radar.

摘要翻译： 该载体大小近似方法使用矢量的分量正交，选择乘法器缩放常量（KX，KY），并尽量减少算术功能和硬件复杂度的对数。 矢量大小由乘法的逼近（20,22）表示通过按比例缩放选择常数（KX，KY）和矢量复数的每个分量（X，Y），然后通过求和（24）在两个所得产品（KXX，KYY ）。 缩放常量（KX，KY）是通过将各正交分量（X，Y）中选出成两个相同的逻辑阵列中的一个（10,12）确定哪个矿每个分量的绝对值的基数为2的对数。 将所得的对数值被馈送，并联到第三逻辑阵列（14），其输出，以解决对实部和虚常数只读存储器发生器（16,18），用于提供respectivement比例常数对（KX，KY）哪些是 在计算向量或复数的近似大小使用。 该装置特别适用于高通量的，流水线，数字信号处理应用：如雷达。

公开(公告)号：EP0264256A3

公开(公告)日：1990-02-07

申请号：EP87309031.0

申请日：1987-10-13

申请人： RAYTHEON COMPANY

发明人： Jagodnik, Anthony J., Jr. ,  Evett, Ronald C.

IPC分类号： G06F15/347

CPC分类号： G06F7/4806 ,  G06F7/552 ,  G06F2207/5525

摘要： This vector magnitude approximating method uses logarithms of vector's orthogonal components to select multiplier scaling constants (K x ,K y ) and to minimize arithmetic-function and hardware complexity. The vector magnitude is approximated by multiplying (20,22) each component (X,Y) of a complex number representing the vector by selected scaling constants (K x ,K y ) and then by summing (24) the two resulting products (K x X,K y Y). The scaling constants (K x ,K y ) are selected by feeding each orthogonal component (X,Y) into one of two identical logic arrays (10,12) which determine the base-2 logarithm of the absolute value of each component. The resulting logarithm values are fed, in parallel, into a third logic array (14) which outputs an address to real and imaginary constant read-only memory generators (16,18) for providing respective scaling constant pairs (K x ,K y ) which are used in computing the approximate magnitude of the vector or complex number. The apparatus is particularly applicable to a high-throughput, pipelined, digital signal processing application such as radar.