The De-nosing Algorithm of ECG Signal Based on Wavelet Packet

There is always noise mixed with cardio-electric signal via hardware acquisition, which impede patients’ diagnosis. Wavelet transform can well analyze regional signals, and achieve good result in separating signal and noise by taking advantage of their differences shown in both time and frequency domain. Yet wavelet decomposition focuses on approximate coefficient vector, which leads to loss of original features in time domain during the de-noising preprocess as it continues decomposing in lower frequency direction. Wavelet packet transform is proposed in order to overcome wavelet decomposition’s low frequency resolution ratio in high-frequency section and weak time resolution ratio in low-frequency section. It’s a more elaborate method for signal analysis, and well enhances resolution ratio in both time and frequency domain. This paper mainly presents application of wavelet packet transform in cardio-electric signal de-noising.

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