Exploració per tema "Spectral analysis"

Ara es mostren els items 21-36 de 36

    • On the cramer-rao bound of finite-length cepstrum spectral estimators 

      Nadeu Camprubí, Climent; Lleida Solano, Eduardo (Institution of Electrical Engineers, 1990-07)
      Article
      Accés obert

    • On the stability in phase-lag heat conduction with two temperatures 

      Magaña Nieto, Antonio; Miranville, Alain; Quintanilla de Latorre, Ramón (2018-06-15)
      Article
      Accés obert
      We investigate the well-posedness and the stability of the solutions for several Taylor approximations of the phase-lag two-temperature equations.We give conditions on the parameters which guarantee the existence and ...

    • On the time decay in phase-lag thermoelasticity with two temperatures 

      Magaña Nieto, Antonio; Miranville, Alain; Quintanilla de Latorre, Ramón (AMER INST MATHEMATICAL SCIENCES-AIMS, 2019-09-12)
      Article
      Accés obert
      The aim of this paper is to study the time decay of the solutions for two models of the one-dimensional phase-lag thermoelasticity with two temperatures. The first one is obtained when the heat flux vector and the inductive ...

    • Pitch determination using the cepstrum of the one-sided autocorrelation sequence 

      Nadeu Camprubí, Climent; Pascual Gilabert, Jordi; Hernando Pericás, Francisco Javier (1991)
      Text en actes de congrés
      Accés obert
      A novel cepstral function, the cepstrum (CEP) of the one-sided autocorrelation sequence (COSA), is presented and applied to pitch determination of speech signals. This pitch determination algorithm (PDA) starts from the ...

    • Positive time-frequency distributions based on joint marginal constraints 

      Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1996-08-01)
      Article
      Accés obert
      This correspondence studies the formulation of members of the Cohen-Posch class of positive time-frequency energy distributions. Minimization of cross-entropy measures with respect to different priors and the case of ...

    • Probabilistic estimation of the dynamic response of high-rise buildings via transfer functions 

      Tirado Gutiérrez, Rodolfo Javier; Vargas Alzate, Yeudy Felipe; González Drigo, José Ramón (Elsevier, 2024-03)
      Article
      Accés obert
      The significant number of seismic ground motion records to be considered when designing or assessing civil structures is a common restriction for employing advanced nonlinear dynamic methods. This is because the large ...

    • Simulación físico-matemática de las turbulencias en los incendios de edificación. Propuesta de una nueva metodología de análisis relativa a la verificación cualitativa de las turbulencias simuladas 

      Muñoz Blanc, Carlos (Universitat Politècnica de Catalunya, 2014-05-22)
      Tesi
      Accés obert
      En la Unión Europea, y más concretamente en España, el análisis prestacional de cualquier edificio frente a la acción del fuego es aún un hecho aislado y poco habitual, a pesar de las ventajas que el mismo comporta. No ...

    • Spectral analysis of business and consumer survey data 

      Claveria González, Oscar; Monte Moreno, Enrique; Torra Porras, Salvador (2020-07-08)
      Report de recerca
      Accés obert
      The main objective of this study is two-fold. First, we aim to detect the underlying existing periodicities in business and consumer survey data. With this objective, we conduct a spectral analysis of all survey indicators. ...

    • Spectral iterative algorithm for RCS computation in electrically large or intermediate perfectly conducting cavities 

      Rius Casals, Juan Manuel; Lozano Solsona, Angel; Cardama Aznar, Ángel; Jofre Roca, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1994-06-01)
      Article
      Accés obert
      A novel algorithm designed to compute efficiently and accurately the high-frequency electromagnetic scattering from open-ended waveguide cavities is presented. The cavity is converted into a stepped-waveguide model so that ...

    • Spectral substraction and spectral estimation 

      Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel (2000)
      Text en actes de congrés
      Accés obert
      The problem of spectral subtraction, to estimate the parameters of a single source in colored noise, is used to show the relationships between the likelihood formulation and spectral density estimation. Reported previously ...

    • System identification using a linear combination of cumulant slices 

      Rodríguez Fonollosa, José Adrián; Vidal Manzano, José (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-07-01)
      Article
      Accés obert
      In this paper we develop a new linear approach to identify the parameters of a moving average (MA) model from the statistics of the output. First, we show that, under some constraints, the impulse response of the system ...

    • The effect of respiration-induced heart movements on the ECG 

      Pallàs-Areny, Ramon; Colominas i Balagué, Josep; Rosell Ferrer, Francisco Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1989-06-01)
      Article
      Accés obert
      We present a model describing the rotation of the cardiac vector as a possible mechanism resulting in the presence of respiratory information in the ECG. The way in which this information is revealed is analyzed and the ...

    • The periodogram envelope in parametric and non-parametric spectral estimation 

      Lagunas Hernandez, Miguel A. (1989)
      Text en actes de congrés
      Accés obert
      The role of the periodogram envelope as a nonparametric approach for spectral estimation and its potential in parametric spectral estimation using variational approaches are examined. The spectral envelope, or its prior ...

    • Trace spectral analysis toward dynamic levels of detail 

      Llort Sánchez, Germán; Casas, Marc; Servat, Harald; Huck, Kevin A.; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The emergence of Petascale systems has raised new challenges to performance analysis tools. Understanding every single detail of an execution is important to bridge the gap between the theoretical peak and the actual ...

    • Variations in breathing patterns increase low frequency contents in HRV spectra 

      García González, Miguel Ángel; Vázquez Seisdedos, Carlos; Pallàs-Areny, Ramon (Institute of Physics Publishing, 2000)
      Article
      Accés obert
      This paper shows that variations in breathing patterns broaden heart rate variability (HRV) spectral bands and increase the power amplitude of low-frequency bands. Because of these influences, spectral markers for HRV ...

    • Wigner higher-order spectra: definition, properties, computation and application to transient signal analysis 

      Rodríguez Fonollosa, Javier; Nikias, Chrysostomos L. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-01-31)
      Article
      Accés obert
      The Wigner higher order moment spectra (WHOS) are defined as extensions of the Wigner-Ville distribution (WD) to higher order moment spectra domains. A general class of time-frequency higher order moment spectra is also ...