ECG Coding by Pyramid-Type Non-Orthogonal Subband Filter.

概要

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A new method for subband coding of Electro-cardiogram (ECG) using a pyramid-type non-orthogonal subband filter which is designed by considered to stochastic property of the ECG is proposed. In a data compression of Holter ECG, reducing a calculation cost for the compression is as important as achieving higher compression performance because of limitation of electrical power consumption. Since the calculation cost in subband coding is depend on the number of taps of the subband filter, designing a subband filter with less number of taps is an important issue. We then designed subband filter which has higher coding gain for objective ECG by improving degree of freedom by excluding condition of linear phase property and orthogonality of the subband filter. By applying the filter to the coding of ECG's in MIT/BIH arrhythmia database, we demonstrated that the equivalent coding performance of 5 taps sub-band filter designed by proposed method requires about 12 taps orthogonal wavelet filter, which means reduced calculation cost of filtering.
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