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

摘要： 针对心磁图仪诊断技术在临床上的普及需求和心磁图检查费用高昂的矛盾现状，提出了一种基于巨磁阻抗传感器的心磁信号采集和信号处理方法。该方法依据心磁信号和心电信号的相关性，通过以巨磁阻抗传感器为核心的数据采集电路，同步采集两种信号，并根据功率谱密度分析结果，自动调整带通滤波器的参数，使其能自适应跟踪心电信号的频率，滤除噪声信号，最后取得心磁信号。通过实验证明了该方案可在常温下准确测得心磁信号，且设备维护成本低，操作简单易行。

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