The invention discloses a method and
system for restricting the ECG (Electrocardiogram) interference caused by cardio-
pulmonary resuscitation and an external defibrillator, relating to the technical field of EGG detection. The method comprises the following steps: 1, acquiring an
ECG signal and a
voltage signal of a reference
signal; 2,
processing and analyzing the acquired
ECG signal and
voltage signal; 3, comparing the processed signals with a set value; 4, when the processed signal is greater than the set value, carrying out adaptive filtering; 5, when the processed signal is less than the set value, carrying out
rhythm analysis; 6,
processing and analyzing the signal subjected to adaptive filtering and returning to continuously execute the step 3. The method and
system and the external defibrillator disclosed by the invention, the acquired
ECG signal and the reference signal subjected to
frequency domain analysis, and the energy of
inference in the ECG signal and the proportion to the interference energy to the
total energy of signals are calculated. The frequency of circulation filtering and the step length factor of adaptive filtering are controlled by using the proportion of the interference energy so as to realize dynamic adjustment of the filtering strength, the pushing interference element in the ECG signal is furthest restricted and the characteristics of the ECG signal are highlighted.