摘要
在脑电反馈系统中,对脑电进行滤波以获取系统处理所需频段信号是实现系统功能的一个重要部分,考虑到脑电信号的特点和无限冲击响应(IIR)滤波器具有的各种优点,在系统中该功能采用IIR滤波器实现,同时由于系统硬件的字长精度有限,直接在其上实现滤波器会导致出现较大误差以及工作不稳定的现象,需要对滤波器进行精度扩展。本文介绍了在脑电反馈系统上实现的精度扩展IIR滤波器的设计原理,并对实现的细节系统地进行了描述。
In EEG feedback system, it＇ s important to filter the signal of needed bands and process it. Due to the feathers of brain wave and the superiority of Infinite Impulse Response （IIR） filters, IIR filters are used to filter the needed band in EEG feedback system, Furthermore, due to the hardware limited word precision, the IIR filters designed and implemented directly in the hardware will lead to serious error and unstable problem. It＇ s necessary to extend the precision of the IIR filters, This paper introduces the principles of extended precision fIR filter design in EEG feedback system, and illustrates the details of the implementation.
出处
《计算机与现代化》
2006年第8期19-21,共3页
Computer and Modernization
