摘要
设计数字式巴特沃斯滤波器的传统方法是先设计好相应的模拟滤波器,再经过双线性变换得到数字式巴特沃斯滤波器,因此必须依赖于模拟滤波器,同时无法得到零极点数量不相等的滤波器。本文采用通用公式设计数字式巴特沃斯滤波器,并和采用传统设计的方法相比较,两者的结果是相一致的,同时还设计出零极点数量不相等的滤波器。理论和数据表明该方法优于传统的数字式巴特沃兹滤波器设计方法。
The classical method for the digital Butterworth filter design is to work out corresponding analog filter first, then obtain the digital Butterworth filter from the bilinear transform, therefore the traditional method relies on the analog filter, and cannot obtain the zeros-poles plot equal filter. This paper introduces the general formula to design the digital Butterworth filters without the help of the analog filter, and the resuits are consistent after comparing with the traditional method, also designs the zerospoles plot equal filter. The theory and the data show this method is better than the traditional design method for the digital Butterworth filter.
出处
《电测与仪表》
北大核心
2006年第4期37-38,7,共3页
Electrical Measurement & Instrumentation
关键词
巴特沃斯
滤波器
双线性变换
零极点
Butterworth
filter
bilinear transform
zeros-poles plot
