Ara es mostren els items 73-92 de 127

    • Low-cost method to estimate body capacitance to ground at mid frequencies 

      Aliau Bonet, Carles; Pallàs-Areny, Ramon (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Impedance measurements that involve the human body are affected by the capacitance between the body and earth ground. This paper describes a low-cost method to estimate that capacitance that can be applied to impedance ...
    • Measurement of three independent components in impedance sensors using a single square wave 

      Lario García, Javier; Pallàs-Areny, Ramon (Elsevier, 2003-12-17)
      Article
      Accés obert
      Two-wire impedance-based sensors involving electrolytes add the impedance of the electrodes to the electrical impedance of the medium to measure. An equivalent circuit for the measured impedance is a resistance in series ...
    • Method and apparatus for obtaining cardiovascular information by measuring between two extremities 

      Pallàs-Areny, Ramon; Casanella Alonso, Ramón; Gómez Clapers, Joan (2014-06-04)
      Report de recerca
      Accés obert
      In this patent of invention there are described a method and an apparatus for obtaining information on the cardiovascular system beat by beat and continuously which are based exclusively on measurements between two limbs ...
    • Microphonics in biopotential measurements with capacitive electrodes 

      Luna Lozano, P. S.; Pallàs-Areny, Ramon (IEEE Press. Institute of Electrical and Electronics Engineers, 2010)
      Comunicació de congrés
      Accés obert
      Biopotential measurements with capacitive electrodes do not need any direct contact between electrode and skin, which saves the time devoted to expose and prepare the contact area when measuring with conductive electrodes. ...
    • Multi-signal bathroom scale to assess long-term trends in cardiovascular parameters 

      Gómez Clapers, Joan; Casanella Alonso, Ramón; Pallàs-Areny, Ramon (IEEE, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper describes the circuits and signal processing techniques that convert an electronic bathroom scale intended for bioimpedance analysis (BIA) into a compact system to acquire the electrocardiogram (ECG), the ...
    • Noise reduction in AC-coupled amplifiers 

      Serrano Finetti, Roberto Ernesto; Pallàs-Areny, Ramon (2014-07-01)
      Article
      Accés restringit per política de l'editorial
      AC-coupled amplifiers are noisier than dc-coupled amplifiers because of the thermal noise of the resistor(s) in the ac-coupling network and the increased contribution of the amplifier input noise current i(n). Both ...
    • Noniterative algorithms for electrical resistivity imaging applied to subsurface local anomalies 

      Gasulla Forner, Manuel; Pallàs-Areny, Ramon (Institute of Electrical and Electronics Engineers, 2005-12)
      Article
      Accés obert
      In this paper, we compare five noniterative (one-step) algorithms for two-dimensional electrical resistivity imaging applied to the location of subsurface local anomalies. Here, we analyze the performance of two backprojection ...
    • Novel indices of ventricular repolarization to screen post myocardial infarction patients 

      Alvarado Serrano, Carlos; Ramos Castro, Juan José; Pallàs-Areny, Ramon (Elsevier, 2006-05)
      Article
      Accés obert
      We propose novel indices of ventricular repolarization intervals, the JTp/JT, Tpe/JTp and Tpe/JT ratios. These indices have been compared with the duration of the ventricular repolarization intervals and other ratios in ...
    • Obtención de parámetros cardiovasculares en una báscula electrónica doméstica 

      Gómez Clapers, Joan; Casanella Alonso, Ramón; Pallàs-Areny, Ramon (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Se presenta un nuevo sistema para obtener parámetros cardiovasculares de forma sencilla y rápida, apto para el uso en entornos extrahospitalarios. Se basa en una báscula electrónica doméstica modificada a la que se ha ...
    • Obtención del ECG en una báscula de baño 

      Díaz Cerecedo, Delia; Casas Piedrafita, Óscar; Pallàs-Areny, Ramon (2012)
      Comunicació de congrés
      Accés obert
    • Obtención robusta de la frecuencia cardiaca en una báscula electrónica domestica 

      Gilaberte Elvira, Sonia; Casanella Alonso, Ramón; Pallàs-Areny, Ramon (2009-11-18)
      Comunicació de congrés
      Accés restringit per acord de confidencialitat
    • On bio activity related signals from contactless electrode measurements 

      Pallàs-Areny, Ramon; Casas Piedrafita, Óscar (2016-02-01)
      Article
      Accés obert
      In a recent paper on a displacement current sensor for contactless detection of bio-activity related signals [1], it was stated that “A potential means for human presence detection…is via sensing…human biopotentials” ...
    • On bio-activity related signals from contactless electrode measurements 

      Pallàs-Areny, Ramon; Casas Piedrafita, Óscar (2015)
      Article
      Accés obert
    • On the common mode response of fully differential circuits 

      Gasulla Forner, Manuel; Casas Piedrafita, Óscar; Pallàs-Areny, Ramon (Institute of Electrical and Electronics Engineers, 2000)
      Text en actes de congrés
      Accés obert
      Differential circuits are often described by their differential gain and common mode rejection ratio (CMRR). This approach, however, neglects the effect that the common mode signal has on the transient response and stability ...
    • On the feasibility of noncontact ECG measurements 

      Pallàs-Areny, Ramon; Casas Piedrafita, Óscar (2016-03-01)
      Article
      Accés obert
      The article by Kranjec et al. [1], “Novel methods of noncontact heart rate measurement: A feasibility study” is interesting and informative as it compares different contactless methods for heart rate detection. Nevertheless, ...
    • On the thermal noise introduced by a resistor in a circuit 

      Vargas Drechsler, Manuel; Pallàs-Areny, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1996-02-01)
      Working paper
      Accés obert
      Comentari sobre l'article publicat anteriorment pels mateixos autors: Vargas, M; Pallás, R; The seemingly paradoxical noise behaviour some active circuits. IEEE Transactions on Instrumentation and Measurement. 1994, vol. ...
    • On the zero- and first-order interpolation in synthesized wave for testing purposes 

      Lozano Nieto, Alberto; Rosell Ferrer, Francisco Javier; Pallàs-Areny, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1992-12-02)
      Article
      Accés obert
      This paper deals with the quality requirements of synthesized sine waves reconstructed through a zero- or first- order hold for testing purposes, in particular when a switching demodulator is used. In this case, the ...
    • Optimal two-point static calibration of measurement systems with quadratic response 

      Pallàs-Areny, Ramon; Jordana Barnils, José; Casas Piedrafita, Óscar (American Institute of Physics, 2004-11-10)
      Article
      Accés restringit per política de l'editorial
      Measurement devices and instruments must be calibrated after manufacture to correct for component and assembly tolerances, and periodically to correct for drift and aging effects. The number of reference inputs needed for ...
    • Piecewise linearization of quadratic transfer characteristics 

      Pallàs-Areny, Ramon (2022-05-19)
      Report de recerca
      Accés obert
      Piecewise linearization replaces a nonlinear transfer characteristic curve by a string of linear segments that connect several calibration points of the curve. This technique can be implemented by low-power digital ...
    • Redes inalámbricas de sensores en aplicaciones agroambientales 

      Pallàs-Areny, Ramon; Casas Piedrafita, Óscar (2014)
      Article
      Accés restringit per política de l'editorial
      Muchas de las aplicaciones actuales de la electrónica dependen de sensores que obtienen las señales necesarias para monitorizar o controlar procesos de índole tan variada como el número de vehículos en un aparcamiento o ...