Now showing items 1-20 of 62

    • A general analysis of error in noise measurement systems 

      Pradell i Cara, Lluís; Comerón Tejero, Adolfo; Ramírez González, Alejandro (Institute of Electrical and Electronics Engineers (IEEE), 1988)
      Conference report
      Open Access
      General and approximated expressions are presented which allow the identification and quantification of errors in noise figure measurements that use the Y-factor method. This formulation is a generalization of that in /2/ ...
    • Active noise cancellation 

      Torre Rovira, Guillem de la (Universitat Politècnica de Catalunya, 2017-06)
      Bachelor thesis
      Open Access
      Donats els recents progressos en Cancel·lació Activa de Soroll (CAS) per a Avions [11], Cascos de música [10], Telèfons [8], etc. vaig decidir desenvolupar un sistema de cancel·lació activa de soroll per espais menys ...
    • Analysis of denoising algorithms for Polarimetric SAR data: the cases of the Bilateral and the Non Local Means filters 

      Martinez Del Hoyo Guri, Antonio (Universitat Politècnica de Catalunya, 2014-09-12)
      Master thesis (pre-Bologna period)
      Open Access
      Covenantee:   Technische Universität Berlin
      [ANGLÈS] The aim of this thesis is to do an in-depth analysis of state-of-the-art denoising methods for Polarimetric SAR data and to propose a new algorithm taking advantage on their strong points. The filters under analysis ...
    • Analysis of noise-induced temporal correlations in neuronal spike sequences 

      Reinoso, Jose A.; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (2016-11-01)
      Article
      Open Access
      We investigate temporal correlations in sequences of noise-induced neuronal spikes, using a symbolic method of time-series analysis. We focus on the sequence of time-intervals between consecutive spikes (inter-spike-intervals, ...
    • Analysis of the Path Tracing rendering method on CPU and GPU 

      Gil González, Jordi (Universitat Politècnica de Catalunya, 2020-04-23)
      Bachelor thesis
      Open Access
      Fa molts anys que es realitza recerca al camp de la renderització realista. Tenim diversos mètodes capaços d'aconseguir imatges amb un gran grau de realisme, com pot ser Ray Tracing, Path Tracing, Photon Mapping o Metropolis ...
    • Analysis, evaluation, and comparison of polarimetric SAR speckle filtering techniques 

      Foucher, Samuel; López Martínez, Carlos (2014-04)
      Article
      Restricted access - publisher's policy
      Speckle noise filtering on polarimetric SAR (PolSAR) images remains a challenging task due to the difficulty to reduce a scatterer-dependent noise while preserving the polarimetric information and the spatial information. ...
    • Application of the method of decomposition of lidar signal-to-noise ratio to the assessment of laser instruments for gaseous pollution detection 

      Agishev, Ravil R.; Comerón Tejero, Adolfo; Gross, B.; Moshary, F.; Ahmed, S.; Gilerson, A.; Vlasov, V.A. (2004-07)
      Article
      Open Access
      A general methodology for rating both performance and potential of lidar systems used for detection of atmospheric trace constituents including pollutants and gas leaks is developed. By individually examining and ...
    • Assessment of environmental noise and its effect on neonates in a Neonatal Intensive Care Unit 

      Romeu Garbí, Jordi; Cotrina, Laura; Perapoch, Josep; Linés, Marcos (2016-10-01)
      Article
      Open Access
      A method for analyzing the influence of noise on newborns is proposed. The method consists of defining three different types of time interval (quiet, noisy and nursing) and, for each period, environmental noise levels, ...
    • Bilateral distance based filtering for polarimetric SAR data 

      Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean; Deng, Xinping (2013-10-30)
      Article
      Open Access
      This paper introduces a non-linear Polarimetric SAR data filtering approach able to preserve the edges and small details of the data. It is based on exploiting the data locality in both, the spatial and the polarimetric ...
    • Characterization of laplacian surface electromyographic signals during isometric contraction in biceps brachii 

      Estrada, Luis; Torres Cebrián, Abel; Garcia Casado, Javier; Prats Boluda, Gema; Jané Campos, Raimon (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      Surface electromyography (sEMG) is a noninvasive technique for monitoring the electrical activity produced by the muscles. Usually, sEMG is performed by carrying out monopolar or bipolar recordings by means of conventional ...
    • Coherence and anticoherence resonance tuned by noise 

      Lacasta Palacio, Ana María; Sagués Mestre, Francesc; Sancho, Jose Maria (American Physical Society, 2002-10-24)
      Article
      Open Access
      We present numerical evidence and a theoretical analysis of the appearance of anticoherence resonance induced by noise, not predicted in former analysis of coherence resonance. We have found that this phenomenon occurs for ...
    • Collective stochastic coherence and synchronizability in weighted scale-free networks 

      Balenzuela, Pablo; Rue Queralt, Pau; Boccaletti, Stefano; García Ojalvo, Jordi (2014-01-21)
      Article
      Open Access
      Coupling frequently enhances noise-induced coherence and synchronization in interacting nonlinear systems, but it does so separately. In principle collective stochastic coherence and synchronizability are incompatible ...
    • Comments on and extensions of wolf's signal-to-channel noise formulas for delta-modulated systems 

      Figueiras Vidal, Aníbal R.; Mariño Acebal, José Bernardo; Lagunas Hernandez, Miguel A. (1980-01)
      Article
      Open Access
    • Comparison of different order cumulants in a speech enhancement system by adaptive Wiener filtering 

      Salavedra Molí, Josep; Masgrau Gómez, Enrique José; Moreno Bilbao, M. Asunción (IEEE Press, 1993)
      Conference report
      Open Access
      The authors study some speech enhancement algorithms based on the iterative Wiener filtering method due to Lim and Oppenheim (1978), where the AR spectral estimation of the speech is carried out using a second-order analysis. ...
    • Conditional maximum likelihood frequency estimation for staggered modulations 

      Riba Sagarra, Jaume; Vázquez Grau, Gregorio (1998)
      Conference report
      Open Access
      The use of spectrally efficient continuous phase modulations for mobile communications may lead to a serious performance degradation of the classical frequency error detectors (FEDs) due to the presence of self-noise. This ...
    • Correlated multiple antennas spectrum sensing under calibration uncertainty 

      Pourgharehkhan, Zahra; Taherpour, Abbas; Sala Álvarez, José; Khattab, Tamer (2015-12-01)
      Article
      Open Access
      We address the problem of spectrum sensing in cognitive radios (CRs) when the secondary user (SU) is equipped with a multiantenna receiver. We consider scenarios with correlation between the received channels at different ...
    • ¿Cuánto estamos dispuestos a pagar por el silencio? Un análisis contingente para la ciudad de Barcelona 

      Marmolejo Duarte, Carlos Ramiro; Frizzera, Agustín (Centre de Política del Sòl i Valoracions - Universitat Politècnica de Catalunya, 2008)
      Article
      Open Access
      El municipio de Barcelona posee un modelo de ciudad compacta caracterizado por una elevada densidad, en la que conviven diversas actividades económicas y residenciales, lo cual aunado a un diseño adecuado de los espacios ...
    • Design of a PMS for the West-North arrival configuration of the Barcelona Airport 

      Ceballos Sopena, Daniel (Universitat Politècnica de Catalunya, 2020-07-24)
      Bachelor thesis
      Restricted access - author's decision
      In this project a new arrival procedure for the West-North configuration of the Barcelona Airport has been designed with the main objective of reducing noise impact in populated areas. To do that, three different options ...
    • Differential susceptibility to noise of mixed Turing and Hopf modes in a photosensitive chemical medium 

      Alonso Muñoz, Sergio; Míguez, David G.; Sagués Mestres, Francesc (2007-12-31)
      Article
      Open Access
      We report on experiments with the photosensitive chlorine dioxide-iodine-malonic acid reaction (CDIMA) when forced with a random (spatiotemporally) distributed illumination. Acting on a mixed mode consisting of oscillating ...
    • Diseño de un prototipo de auriculares con cancelación activa de sonido 

      Duat Barral, Jordi (Universitat Politècnica de Catalunya, 2015-10-28)
      Master thesis
      Restricted access - confidentiality agreement