Fast Implementation method of a Wideband Butterworth Band Pass Filter for Signal Acquisition of Human Heart Sound

應用於心音擷取之巴特沃斯寬頻帶通濾波器快速實現方法

蔡明忠(Ming-Jong Tsai) ； 周文揚(Wen-Yang Chou)

《中國機械工程學刊》 34卷4期 (2013/08) Pp. 321-330

摘要

本文提出一種應用於心音擷取之巴特沃斯寬頻帶通濾波器設計與快速實現方法，以簡化帶通濾波器的設計，濾波頻率範圍比擬心音聽診器之鐘式與膜式操作模式。此整合式設計程序分為三階段－設計、模擬及實作修正。首先以簡化的濾波器理論架構，推導出符合心音特性需求的零組件設計值，接著以模擬軟體TINA-TI驗證設計值的頻率響應，並且進行調整以取得所需參數值。再依模擬後調整所得零組件參數值進行實作組裝與修正，實驗結果得到電阻值比率參數為高通濾波器的1.27和低通濾波器的1.04。最後以實際擷取的人類心音來驗証本方法的實用性。由於本文提出的方法可簡化與容易實現濾波器設計，也可以適用於其他應用。

並列摘要

This paper presents a fast implementation method of a wideband Butterworth of a band pass filter for acquisition of human heart sound to simplify the traditional design work. The range of filter frequency emulates an acoustic stethoscope with bell mode and diaphragm mode. The integrated method includes theoretical design, simulation, and implementation regulation. During theoretical design stage, component values of simplified filter architecture are calculated according to the pass band requirement for filtering the heart sound. Then, a design tool TINA-TI is used to simulate the performance of the filter design and to obtain proper components value. Experimental results show that the obtained resistor ratio factors are 1.27 for the high pass filter and 1.04 for the low pass filter. A human heart sound is also used to demonstrate the feasibility of this approach. The proposed method can also be used to design Butterworth band pass filters for other applications.

並列關鍵字

acoustic stethoscope ； heart sound ； band pass filter ； Butterworth filter