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Continuous quantification of spectral coherence using quadratic time-frequency distributions: Error analysis and application

Abstract:

Quadratic time-frequency (TF) distributions have an excellent joint TF resolution, but their applicability is limited by the presence of interferences. In this communication, a methodology for robustly estimating TF coherence (TFC), based on signal-dependent smoothing of the Wigner Ville distribution, is shown to provide a reliable continuous quantification of cardiovascular interactions during non stationary conditions. Bias, standard deviation and tracking capability of the TFC estimator have been quantified in different physiological contexts. Linear coupling between HRV and SPV during tilting has been assessed. It is observed that orthostatic stress provokes a significant increase (p ≤0.02) of TFC in both LF and HF range.

Año de publicación:

2009

Keywords:

    Fuente:

    scopusscopus

    Tipo de documento:

    Conference Object

    Estado:

    Acceso restringido

    Áreas de conocimiento:

    • Optimización matemática
    • Procesamiento de señales
    • Espectroscopia

    Áreas temáticas:

    • Ciencias de la computación

    Contribuidores:

    Mainardi L.T.Mainardi L.T.
    Raquel BailónRaquel Bailón
    Pablo LagunaPablo Laguna
    Orini M.Orini M.
    Minchole A.Minchole A.