Characterisation of Signal Modality: Exploiting Signal Nonlinearity in Machine Learning and Signal Processing |
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Authors: | Beth Jelfs Soroush Javidi Phebe Vayanos Danilo Mandic |
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Institution: | (1) Department of Electrical and Electronic Engineering, Imperial College London, London, UK |
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Abstract: | A novel method for online tracking of the changes in the nonlinearity within both real-domain and complex–valued signals is
introduced. This is achieved by a collaborative adaptive signal processing approach based on a hybrid filter. By tracking
the dynamics of the adaptive mixing parameter within the employed hybrid filtering architecture, we show that it is possible
to quantify the degree of nonlinearity within both real- and complex-valued data. Implementations for tracking nonlinearity
in general and then more specifically sparsity are illustrated on both benchmark and real world data. It is also shown that
by combining the information obtained from hybrid filters of different natures it is possible to use this method to gain a
more complete understanding of the nature of the nonlinearity within a signal. This also paves the way for building multidimensional
feature spaces and their application in data/information fusion. |
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