基于FPGA的眼科超声数字化中CIC内插滤波器的改进与实现  

Improvement and implementation of CIC interpolation filter in ophthalmology ultrasonography digital image based on FPGA

作　　者：程春卯[1] 计建军[1] 王延群[1] 杨军[1] 王晓春[1] 周盛[1] 宋学东[1] 段炳柱[1] 

机构地区：[1]中国医学科学院北京协和医学院生物医学工程研究所,天津300192

出　　处：《国际生物医学工程杂志》2010年第1期21-23,43,共4页International Journal of Biomedical Engineering

基　　金：基金项目：天津市重点基金项目（08JczDc25500）;中央级公益性研究院所基本科研业务专项

摘　　要：目的眼科高频超声数字化成像中使用内插滤波器可等效地提高采样率以节约资源。方法在研究分析了级联积分梳状（CIC）滤波器的基础上，结合运用余弦（COSINE）滤波器和内插二阶多项式（1SOP）滤波器对其进行改进。结果通过硬件描述语言描述改进后的高效结构，并在现场可编程门阵列（FPGA）中实现，最后通过实验仿真验证该内插变频算法的有效性。结论改进后的CIC滤波器基本保留了效率和资源节约方面的优势，同时也改善了其通带宽度和阻带衰减特性，能够适用于10MHz的高频眼科超声信号处理的要求。Objective The aim of this study was to improve cascaded integrator comb （CIC） interpolation filter for the enhancement of sampling frequency in the ophthalmology ultrasonography digital imaging system. Methods CIC filter was improved base on the analysis of it and the combined introduction of COSINE and interpolated second-order polynomials（ISOP） filters. Results The modified structures were implemented in field programmable gate array（FPGA） using verilog hardware description language. The algorithm was validated by simulation. Conclusion The results showed that the improved CIC not only had the advantage of high efficiency and saving more resources, but also ameliorated its pass band and stop band. It is applicable in high frequency uhrasonography digital signal processing.

关 键 词：CIC内插滤波器 眼科超声 现场可编程门阵列 

分 类 号：TN713[电子电信—电路与系统]