摘要
从硬件和软件数字信号处理方面介绍了表面肌电检测中消除工频干扰的方法,硬件上采用了共模屏蔽驱动电路,模拟陷波器;数字信号处理方面应用自适应数字陷波器和谱内插的方法。模拟陷波器和数字陷波器由于消除工频干扰的同时也去除了信号成分,一般只在简单生物反馈中使用。谱内插的方法是在假设真实信号的50Hz成分可以通过内插法由相邻的频率成分估计出,这样就可以消除工频干扰,而且即使工频干扰的相位发生变化也可很好的消除其影响。
The paper introduces the methods to eliminate the power line interference in both hardware and digital signal processing in SEMG detection. We design the differential circuit to be actuated by common mode, analog notch filter in hardware. And as the frequency of the power line interference is not always stable in 50Hz, the measure of adaptive digital notch filter and spectrum interpolation are taken in digital signal processing, However both the analog and digital notch filter removes the signal component when they eliminate the power line interference, so they are only used in simple biofeedback, In digital signal processing, a novel approach （spectrum interpolation） is introduced which assumed that the magnitude of the original 50 Hz component of the signal can be approximated by interpolating between the adjacent frequencies in the power spectrum, Therefore the approach can eliminate the power line interference well, even its phase changes.
出处
《北京生物医学工程》
2006年第1期63-66,共4页
Beijing Biomedical Engineering
