| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for eliminating electric interference from a physiological signal. <P>SOLUTION: A method for monitoring an electrocardiogram (ECG) signal of a subject, includes steps of: digitally sampling an average signal from at least a first ECG electrode; determining an average interference frequency; and digitally sampling and buffering a raw ECG signal from at least a second ECG electrode. This method further includes steps: filtering the raw ECG signal to generate a residual signal; calculating, based on the residual signal, a first amplitude and a first phase shift of a primary interference signal at the average interference frequency and a second amplitude and a second phase shift of one or more harmonic interference signals at respective multiples of the average interference frequency; and digitally subtracting the primary interference signal and the one or more harmonic interference signals from the raw ECG signal so as to generate and output a clean ECG signal. <P>COPYRIGHT: (C)2009,JPO&INPIT |
