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常州大学学报(自然科学版)[ISSN:2095-0411/CN:32-1822/N]

卷:

期数:

2002年04期

页码:

58-60

栏目:

出版日期:

2002-12-25

文章信息/Info

Title:

The Programming Principle of the High Accuracy Fixed -point Number Square Root Assembly Subrotine

作者:

张小鸣;  王正洪;  朱正伟

江苏石油化工学院计算机科学与工程系, 江苏常州213016

Author(s):

ZHANG Xiao -ming ;  WANG Zheng -hong ;  ZHU Zheng -wei

Department of Computer Science and Technolog y , Jiangsu Insti tute of Pet rochemical Technology , Changzhou 213016 , China

关键词:

平方根; 定点数; 定点CPU ; 数字信号处理; 电力监测

Keywords:

squareroo t ; f ixed -point number ; fixed -point CPU ; DSP ; electric pow er monitering

分类号:

T P 313 ;TB 115

文献标志码:

A

摘要:

在8/ 16 位单片机或32 位定点DSP 实时测控系统中, 汇编应用程序仍占主导地位。介绍一种用定点实数格式实现平方根 汇编子程序的方法, 并通过与3 字节浮点数平方根汇编子程序运算结果比较发现:前者比后者的精度更高, 在保持精度不变 时, 开平方根数的范围更大。

Abstract:

In real time measurement control sysytem of 8 -16 bits single chip microcomputer or 32 bi ts DSP , assembly application progrom st ill dominates .This paper int roduces a method that implements the square root assembly subrotine (the former)w ith the fixed -point number format .By comparing w ith the calculating result s of 3 bytes f loat -point number square roo t assembly subrotine (the latter), i t w as found that the former′ s calculating accuracy is higher than the lat ter′s and the range of the square root numbers is wider in keeping accuracy constant .

备注/Memo

备注/Memo:

作者简介:张小鸣(1958 -), 男, 安徽合肥人, 副教授。

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更新日期/Last Update: 2002-12-25