摘要
噪声的消除一直是微弱信号检测和处理中尤为重要的一个环节 .从小波变换的角度出发 ,利用了小波变换在时、频两域都具有表征信号局部特征的能力 ,对心磁信号这种典型的微弱信号进行了消噪处理 .实验中的心磁数据是单通道高温超导量子干涉磁强计测得 .理论分析和实验结果表明 ,这种方法能有效地提高输出信噪比 ,同时也适合于其他非平稳信号的消噪 .
How to extract the magnetocardiographic (MCG) signals from the noisy background is the key of MCG signal processing. In this paper, wavelet transformation is adopted to recover the MCG signals, acquired by using the high T-c dc-SQUID magnetometer developed at our institute. The results of this work show that this method is much more effective than other methods used before and can be implemented in the MCG system for routing operation. This method can also be used in noise cancellation of other non-stationary signals.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第4期1943-1949,共7页
Acta Physica Sinica
基金
中国科学院知识创新工程 (批准号 :KJCX2 W4)资助的课题~~
