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

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.