关键词: 心磁信号, 心电信号, 同步采集, 巨磁阻抗传感器, 带通滤波, 信号处理

Abstract: Aiming at the active demand of the clinical application of magnetic cardiograph diagnosis technology and the contradiction about the high cost in magnetocardiography examination, a kind of magnetic signal acquisition and signal processing method based on giant magneto impedance sensor is proposed. According to the correlation between the magnetic signal and the ECG signal, the two signals are collected synchronously and the parameters of the band-pass filter are automatically adjusted according to the power spectral density analysis result. So the band-pass filter can adaptively track the frequency of the ECG signal and filter out the noise signal, and finally get the heart magnetic signal. The experimental results show that the proposed method can effectively detect the magnetic signal in ordinary temperature, and the equipment spends lower in cost and convenient in operation.

Key words: cardiac magnetic signal, electrocardiosignal, synchronous acquisition, giant magneto-impedance sensor, bandpass filter, digital signal processing