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提出了一种基于数据重置最小均方算法的自适应数字滤波器,并将其应用于抑制心磁信号的背景噪声.数值模拟结果表明该滤波器对于相关噪声,尤其是有幅值变化和时间延迟的情况,有很强的抑制效果.该滤波器有很宽的带宽.利用它可以使心磁信号的信噪比提高到器件的本征噪声水平.利用周期平均的方法进一步提高信噪比,对滤波前后心磁信号的频谱进行了分析.
An adaptive digital filter based on the data reduction least mean square algorithm is proposed and applied to suppress the background noise of the magnetic signal.Numerical simulation results show that this filter has good performance in the correlation noise, Time delay, there is a strong inhibitory effect.The filter has a wide bandwidth, use it to make the signal-to-noise ratio of the heart magnetic signal to the device’s intrinsic noise level.Use the averaging method to further improve the signal-to-noise The frequency spectrum of the signal before and after the filtering was analyzed.