A digital filtering scheme for SQUID based magnetocardiography |
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| Authors: | Zhu Xue-Min Ren Yu-Feng Yu Hong-Wei Zhao Shi-Ping Chen Geng-Hu Zhang Li-Hua Yang Qian-Sheng |
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| Affiliation: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | Considering the properties of slow change and quasi-periodicity ofmagnetocardiography (MCG) signal, we use an integrated technique of adaptiveand low-pass filtering in dealing with two-channel MCG data measured by high$T_{rm c}$ SQUIDs. The adaptive filter in the time domain is based on a noise feedbacknormalized least-mean-square (NLMS) algorithm, and the low-pass filter witha cutoff at 100Hz in the frequency domain characterized by Gaussian functions iscombined with a notch at the power line frequency. In this way, bothrelevant and irrelevant noises in original MCG data are largely eliminated.The method may also be useful for other slowly varying quasi-periodicalsignals. |
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| Keywords: | SQUIDs adaptive filter magnetocardiography |
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