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- W2106954383 abstract "Probabilistic finite state automata (PFSA) have been widely used as an analysis tool for signal representation and modeling of physical systems. This paper presents a new method to address these issues by bringing in the notion of vector-space formulation of symbolic systems in the setting of PFSA. In this context, a link is established between the formal language theory and functional analysis by defining an inner product space over a class of stochastic regular languages, represented by PFSA models that are constructed from finite-length symbol sequences. The norm induced by the inner product is interpreted as a measure of the information contained in the respective PFSA. Numerical examples are presented to illustrate the computational steps in the proposed method and to demonstrate model order reduction via orthogonal projection from a general Hilbert space of PFSA onto a (closed) Markov subspace that belongs to a class of shifts of finite type. These concepts are validated by analyzing time series of ultrasonic signals, collected from an experimental apparatus, for fatigue damage detection in polycrystalline alloys." @default.
- W2106954383 created "2016-06-24" @default.
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- W2106954383 date "2013-09-01" @default.
- W2106954383 modified "2023-10-16" @default.
- W2106954383 title "Hilbert space formulation of symbolic systems for signal representation and analysis" @default.
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- W2106954383 doi "https://doi.org/10.1016/j.sigpro.2013.02.002" @default.
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