摘要
在许多数字信号处理中,一般都会有实时性的要求,在满足计算精度条件下,函数的运算速度非常重要。在DSP上实现基本函数的计算方法有多种,通过设计一个简单的查表电路,可以用查表法快速计算函数值,此电路也使函数表的空间扩展不受DSP存储器空间限制。另外,还给出了三角函数、自然对数和平方根函数表的制作方法以及用查表法求基本函数值的过程。
In many digital signal processing, in generally, real -time must be asked for. The operation speed of function is very important under meeting the condition of operation precision. There are many ways to realize operation of basic function on DSP, with designing a simple look- table circuit, the function value can be calculated speedily by look- table algorithm, this circuit also makes the space expanding of the function table is not handicaped by memory space of DSP. Besides, the making ways of trigonometric function table,natural logarithm function table and square root function table are given,the course to calculate basic function value is also given by look - table algorithm.
出处
《现代电子技术》
2008年第5期140-141,144,共3页
Modern Electronics Technique
关键词
函数运算
三角函数
对数
查表法
function operation
trigonometric function
logarithm
look - table algorithm
