摘要
对数字信号处理中定点计算字长保留问题进行了研究。首先分析了定点计算中截短量化噪声、保留字长与信噪比损失的关系;而后针对信号定点处理中的多次字长截短问题,给出一种基于数字AGC的字长截短控制算法,并在FPGA硬件平台上对算法进行了验证。理论分析和验证结果表明,该算法能够适应输入信号的变化,保证处理流程中的有效量化位数与量化信噪比。
The retaining of the bit-length in the fix-point caleulation of digital signal processing was studied in this paper. Firstly we analyzed the quantization noise caused by multiple bit-length control and the expression of bit-length and SNR loss; then discussed the bit-length control, and gave a bit-length control algorithm based on digital AGC. Finally the algorithm for multiple bit-length control in variable signal processing was proved through the simulation based on FPGA.
出处
《微型机与应用》
2010年第11期10-13,共4页
Microcomputer & Its Applications
关键词
数字信号处理
定点计算
有限字长效应
数字AGC
digital signal processing
fix-point processing
finite bit-length
digital AGC
