26 October 2004 Tracking of the instantaneous bandwidth in bio-signals: the Copula-based positive distribution and generalized equivalent bandwidth
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Abstract
In this paper, we propose a method for tracking of a instantaneous equivalent bandwidth (IEBW) of non-stationary random signals. IEBW is defined on the positve time-frequency distribution of a non-stationary random signal by using Renyi entropy. It is a natural extension of a equivalent bandwidth for stationary random signals. In order to obtain the positive time-frequency satisfying the marginals of a random signal, we have modified a copula-based time-frequency technique slightly. We, then, showed the results of two simple computer simulations. The results show that the method presented here can track the IEBW of the random signals properly. We also applied the method to track the change of the IEBW of the heart sound. The results suggest that tracking the IEBW could be a useful index for automatic diagnostic of heart disease.
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Hisashi Yoshida, Sho Kikkawa, "Tracking of the instantaneous bandwidth in bio-signals: the Copula-based positive distribution and generalized equivalent bandwidth", Proc. SPIE 5559, Advanced Signal Processing Algorithms, Architectures, and Implementations XIV, (26 October 2004); doi: 10.1117/12.564253; https://doi.org/10.1117/12.564253
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