Ara es mostren els items 1-20 de 127

    • A comprehensive model for power line interference in biopotential measurements 

      Fernández Chimeno, Mireya; Pallàs-Areny, Ramon (Institute of Electrical and Electronics Engineers, 2000-06-30)
      Article
      Accés obert
      Power line interference is a major problem in high-resolution biopotential measurements. Because interference coupling is mostly capacitive, shielding electrode leads and a high common-mode rejection ratio (CMRR) are ...
    • A fast method to estimate body capacitance to ground 

      Aliau Bonet, Carles; Pallàs-Areny, Ramon (2012)
      Text en actes de congrés
      Accés obert
    • A fast method to estimate body capacitance to ground at mid frequencies 

      Aliau Bonet, Carles; Pallàs-Areny, Ramon (University of Oslo, 2015-12-18)
      Article
      Accés obert
      Impedance measurements that involve the human body are affected by the capacitance between the body and earth ground. This paper describes a fast method to estimate that apacitance at 10 kHz, which is valid for impedance ...
    • A hands-on approach to differential circuit measurements 

      Pallàs-Areny, Ramon; Casas Piedrafita, Óscar (Elsevier, 2007-01)
      Article
      Accés obert
      Electronic engineering is showing a definite trend towards differential circuits. However, most measurement instruments are single-ended. Consequently, engineering graduates often lack the skills to perform correct ...
    • A novel algorithm for fast BCG cycle extraction in ambulatory scenarios 

      Gómez Clapers, Joan; Casanella Alonso, Ramón; Pallàs-Areny, Ramon (2016)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      A novel algorithm JDet for ballistocardiogram (BCG) cycle extraction is presented that is intended for the fast generation of ensemble averages in ambulatory scenarios where the ECG signal is not available. First, the ...
    • A novel fully differential biopotential amplifier with DC suppression 

      Spinelli, Enrique M.; Martínez, Nolberto; Mayosky, Miguel Ángel; Pallàs-Areny, Ramon (Institute of Electrical and Electronics Engineers, 2004-08)
      Article
      Accés obert
      Fully differential amplifiers yield large differential gains and also high common mode rejection ratio (CMRR), provided they do not include any unmatched grounded component. In biopotential measurements, however, the ...
    • A novel low-cost smart leaf wetness sensor 

      Hornero Ocaña, Gemma; Gaitán Pitre, Jorge Eliécer; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar; Pallàs-Areny, Ramon (2017-12-01)
      Article
      Accés obert
    • A novel method to obtain proximal plethysmographic information from distal measurements using the impedance plethysmogram 

      Gómez Clapers, Joan; Casanella Alonso, Ramón; Pallàs-Areny, Ramon (University of Oslo, 2015-12-23)
      Article
      Accés obert
      We present a novel method to detect proximal volume changes based on the impedance plethysmogram (IPG) measured from limb to limb with two electrode pairs symmetrically placed at distal areas of the upper or the lower ...
    • A novel robust index to assess beat-to-beat variability in heart rate time-series analysis 

      García González, Miguel Ángel; Pallàs-Areny, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-06-30)
      Article
      Accés obert
      A new index is proposed to estimate the variance of the differentiated heart rate (RR) time series from its truncated histogram. The index is more robust to artifacts than the standard deviation of the differentiated RR ...
    • A novel sensor-bridge-to-microcontroller interface 

      Custodio Ruiz, Ángel; Bragós Bardia, Ramon; Pallàs-Areny, Ramon (Institute of Electrical and Electronics Engineers, 2001-05)
      Text en actes de congrés
      Accés obert
      Sensor bridges are usually interfaced to microcontrollers by supplying the bridge with a voltage or current and digitizing the resulting voltage or current after being amplified and low-pass filtered. This paper proposes ...
    • A practical approach to electrode-skin impedance unbalance measurement 

      Spinelli, Enrique M.; Mayosky, Miguel Ángel; Pallàs-Areny, Ramon (Institute of Electrical and Electronics Engineers, 2006-07)
      Article
      Accés obert
      Unbalance between electrode-skin impedances is a major problem in biopotential recordings, leading to increased power-line interference. This paper proposes a simple, direct method to measure that unbalance at power-line ...
    • AC-coupled front-end for biopotential measurements 

      Spinelli, Enrique M.; Mayosky, Miguel Ángel; Pallàs-Areny, Ramon (Institute of Electrical and Electronics Engineers, 2003-03)
      Article
      Accés obert
      AC coupling is essential in biopotential measurements. Electrode offset potentials can be several orders of magnitude larger than the amplitudes of the biological signals of interest, thus limiting the admissible gain of ...
    • An algorithm for beat-to-beat heart rate detection from the BCG based on the continuous spline wavelet transform 

      Alvarado Serrano, Carlos; Luna Lozano, Pablo Samuel; Pallàs-Areny, Ramon (2016-05-01)
      Article
      Accés obert
      This work describes an algorithm intended to detect the beat-to-beat heart rate from the ballistocardiogram (BCG) obtained from seated subjects. The algorithm is based on the continuous wavelet transform with splines, which ...
    • An improved buffer for bioelectric signals 

      Pallàs-Areny, Ramon; Colominas i Balagué, Josep; Rosell Ferrer, Francisco Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1989-04-01)
      Article
      Accés obert
      We propose an AC-coupled amplifier that offers a high in-put impedance, thus making it suitable for bioelectric signal amplifi- cation. We also present the necessary formulas for calculating its input impedance and transfer ...
    • Automatic Concealed Heart Rate Detection from the BCG in Seated Position 

      Luna Lozano, P. S.; Pallàs-Areny, Ramon (2015-03-01)
      Article
      Accés obert
      Continuous monitoring of health state is important in elder and chronically ill (but otherwise not critical) patients. Ideally, the patient should not be aware of being continuously monitored. This study describes an ...
    • Automatic detection of ECG ventricular activity waves using continuous spline wavelet transform 

      Alvarado Serrano, Carlos; Arregui, J.; Ramos Castro, Juan José; Pallàs-Areny, Ramon (2005)
      Text en actes de congrés
      Accés obert
      In this study, we present detection algorithms of characteristic points of the QRS and T waves based on the continuous wavelet transform (CWT) with splines. This technique can handle any integer scale and the analysis is ...
    • Basic design of the signal chain in sensor-based measurement systems 

      Pallàs-Areny, Ramon; Casas Piedrafita, Óscar (2022-04-19)
      Report de recerca
      Accés obert
      Sensor signals do not suit direct electronic communication and need further processing before being digitized. Therefore, the requirements of the digitizer add to those needed to fulfill the basic specifications for the ...
    • BiC: Examen 

      Pallàs-Areny, Ramon (Universitat Politècnica de Catalunya, 2014-01-15)
      Examen
      Accés restringit a la comunitat UPC
    • BiC: Examen FQ 

      Pallàs-Areny, Ramon (Universitat Politècnica de Catalunya, 2012-01-24)
      Examen
      Accés restringit a la comunitat UPC
    • BiC: Examen FQ 

      Pallàs-Areny, Ramon (Universitat Politècnica de Catalunya, 2020-01-15)
      Examen
      Accés restringit a la comunitat UPC