Exploració per tema "Fourier transforms"

Ara es mostren els items 1-9 de 9

    • A new positive time-frequency distribution 

      Rodríguez Fonollosa, Javier; Nikias, C L (1994)
      Text en actes de congrés
      Accés obert
      This article studies the formulation of new members of the Cohen-Posch (1985) class of positive time-frequency energy distributions. Members of this class are always positive functionals and satisfy the marginal constraints. ...

    • Análisis de espectrogramas de señales musicales con operadores morfológicos 

      Bustos Manzanet, Laura (Universitat Politècnica de Catalunya, 2020-01)
      Treball Final de Grau
      Accés obert
      The way an instrument is learned to be played has changed a lot since the rise of the internet, specially the show up of YouTube. High amounts of people learn to play instruments such as the guitar from watching videos and ...

    • Caractérisation des signaux radio avec des outils de traitement d’images 

      Morral Adell, Gemma (Universitat Politècnica de Catalunya, 2011-05-09)
      Projecte/Treball Final de Carrera
      Accés obert
      Realitzat a/amb:   École nationale supérieure des télécommunications
      Català: Ens basem en una representació 2D en temps-freqüència dels senyals rebuts després d'una detecció no-coherent ("square law detector" és a dir, es prèn el módul al quadrat de les NFFT dels senyals rebuts dins una ...

    • Image restoracion using the w-slice method 

      Sayrol Clols, Elisa; Chrysostomos, Nikias; Gasull Llampallas, Antoni (1995-08)
      Article
      Accés obert
      We propose the use of higher order statistics (HOS)-based methods to address the problem of image restoration. The restoration strategy is based on the fact that the phase information of the original image and its HOS are ...

    • Interpolation and extrapolation of image partitions using Fourier descriptors: application to segmentation-based coding schemes 

      Marqués Acosta, Fernando; Llorens, Bernat; Gasull Llampallas, Antoni (. S.N., 1995)
      Text en actes de congrés
      Accés obert
      This paper presents an interpolation/extrapolation technique for sequence partitions. It consists of four steps: region parametrization, region interpolation, region ordering and partition creation. The evolution of each ...

    • Non-linear spectral estimation 

      Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1987)
      Text en actes de congrés
      Accés obert
      This work describes the use of constraints in variational procedures for spectral analysis. It is reported how the designer in a variational approach for spectral estimation has to select a set of constraints. At the same ...

    • On the inverse windowed Fourier transform 

      Rebollo Neira, Laura; Fernández Rubio, Juan Antonio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-11-30)
      Article
      Accés obert
      The inversion problem concerning the windowed Fourier transform is considered. It is shown that, out of the infinite solutions that the problem admits, the windowed Fourier transform is the "optimal" solution according to ...

    • Ultrashort pulse characterisation with SHG collinear-FROG 

      Amat Roldán, Iván; Cormack, Iain G.; Loza Álvarez, Pablo; Gualda Manzano, Emilio José; Artigas García, David (2004-03)
      Article
      Accés obert
      We outline criteria for fast and accurate acquisition of collinear FROG (CFROG) trace and how it can be transformed into the more traditional noncollinear FROG trace. The CFROG has an intrinsically simple geometry that ...

    • Validation of numerical models of the offshore wind turbine from the alpha ventus wind farm against full-scale measurements within OC5 Phase III 

      Popko, Wojciech; Robertson, Amy; Jonkman, Jason; Molins i Borrell, Climent; Trubat Casal, Pau (American Society of Mechanical Engineers (ASME), 2019)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The main objective of the Offshore Code Comparison Collaboration Continuation, with Correlation (OC5) project is validation of aero-hydro-servo-elastic simulation tools for offshore wind turbines (OWTs) through comparison ...