Exploració per tema "Telecomunicació"

Ara es mostren els items 1-20 de 766

    • 62: Una herramienta interactiva para el estudio del tratamiento de la señal 

      Mariño Acebal, José Bernardo; Vallverdú Bayés, Sisco (Universidad de las Palmas de Gran Canaria, 1994)
      Text en actes de congrés
      Accés obert

    • A billingual texto-to-speech system in spanish and catalan 

      Bonafonte Cávez, Antonio; Esquerra Llucià, Ignasi; Febrer Godayol, Albert; Vallverdú Bayés, Sisco (Editors: G. Kokkinakis, N. Fakotakis, E. Dermatas; Editorial: WCL, University of Patras, Grece, 1997)
      Text en actes de congrés
      Accés obert
      This paper summarises the text-to-speech system that has been developed during the last years in the Speech Group of the Universitat Politccnica de Catalunya (UPC). The paper emphasises the parts of the system which are ...

    • A broadcast synthesized fm modulator with a radio data system encoder 

      Berenguer Sau, Jordi; Villanueva-Fernández, A. (1996-06)
      Article
      Accés obert
      The design and development of a broadcast FM modulator with a RDS (radio data system) encoder is presented. The system is fully coherent with the modulated RF frequency synthesized in the 875-108 MHz frequency band with ...

    • A channel characterization technique for HF communications 

      Delgado Penin, José Antonio (1985)
      Text en actes de congrés
      Accés obert
      A wideband channel sounder to characterize the HF radio channel is described. Based on a pseudorandom sequence technique it allows the measurement of the complex impulsional response of the channel with time and frequency ...

    • A combined polling and ISMA-DS/CDMA protocol to provide QoS in packet mobile communications systems 

      Pérez Romero, Jordi; Agustí Comes, Ramon; Sallent Roig, Oriol (Institute of Electrical and Electronics Engineers (IEEE), 2000)
      Text en actes de congrés
      Accés obert
      This paper presents a new mechanism that combines the flexibility of an access protocol such as ISMA-DS/CDMA with the ability of a polling mechanism to provide a specific bound for the access delay. This protocol is proposed ...

    • A comparison of several recent methods of fundamental frequency and voicing decision estimation 

      Rodríguez Fonollosa, José Adrián (H. TIMOTHY BRUMMELL, WILLIAM IDSARDI CITATION DELAWARE, NEW CASTLE, DELAWARE, 1996)
      Text en actes de congrés
      Accés obert
      The authors are interested in the comparison of several kinds of methods for fundamental frequency estimation and GCI (glottal closure instant) detection. These methods operate in various domains (time-, frequency- or joint ...

    • A contour matching approach for accurate NOAA-AVHRR image navigation 

      Eugenio, F; Marqués Acosta, Fernando; Suarez, E; Rovaris, E (Eurasip, 2000)
      Text en actes de congrés
      Accés obert
      Although different methods for NOAA AVHRR image navigation have already been established, the multitemporal and multi-satellite character of most studies requires automatic and accurate methods for navigation of satellite ...

    • A contribution to video coding using layers 

      Torres Urgell, Lluís; Lecha, M (1998)
      Text en actes de congrés
      Accés obert
      Layered representations of video sequences, originally introduced in [1], are important in several applications. Specifically, they are very appropriate for object tracking, object manipulation, content-based scalability ...

    • A cost function for the equalization of constant amplitude signals based on statistical reference 

      Sala Álvarez, José (1996)
      Text en actes de congrés
      Accés obert
      The equalization of constant amplitude signals is considered in the scope of this paper. A criterion based on the probability density function (pdf) of the signal of interest is proposed. The objective is to derive a ...

    • A direct-sequence spread-spectrum super-regenerative receiver 

      Moncunill Geniz, Francesc Xavier; Mas Casals, Orestes Miquel; Palà Schönwälder, Pere (Institute of Electrical and Electronics Engineers (IEEE), 2000)
      Comunicació de congrés
      Accés obert
      Current applications of the super-regenerative receiver use narrowband modulations. In this paper a new architecture that allows incoherent detection of spread-spectrum signals is presented. A pseudorandom code generator ...

    • A discrete-time approach to the steady-state and stability analysis of distributed nonlinear autonomous circuits 

      Bonet Dalmau, Jordi; Palà Schönwälder, Pere; Miró Sans, Joan Maria (Institute of Electrical and Electronics Engineers (IEEE), 1998)
      Text en actes de congrés
      Accés obert
      We present a direct method for the steady-state and stability analysis of autonomous circuits with transmission lines and generic nonlinear elements. With the discretization of the equations that describe the circuit in ...

    • A discrete-time approach to the steady-state and stability analysis of distributed nonlinear autonomous circuits 

      Bonet Dalmau, Jordi; Palà Schönwälder, Pere (2000-02)
      Article
      Accés obert
      We present a direct method for the steady-state and stability analysis of autonomous circuits with transmission lines and generic non- linear elements. With the discretization of the equations that describe the circuit ...

    • A discrete-time equivalent system approach to the periodic response of nonlinear autonomous circuits 

      Palà Schönwälder, Pere; Miró Sans, Joan Maria (1994)
      Text en actes de congrés
      Accés obert
      The problem of computing the steady state response of nonlinear autonomous circuits is solved making use of a discrete-time equivalent system approach. With the application of an s-plane to z-plane mapping, the circuit ...

    • A Flexible IP Active Network Architecture 

      Galis, Alex; Serrat Fernández, Juan (Springer, 2000)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents the main concepts of the IST Project FAIN “Future Active IP Networks” [10], a three-year collaborative research project, whose main task is to develop and validate an open, flexible, programmable and ...

    • A game of billiards with spatial solitary waves in ktp 

      Torruellas, W; Torner Sabata, Lluís (1996-03)
      Article
      Accés restringit per política de l'editorial

    • A generic radio channel emulator to evaluate higher layer protocols in a CDMA system 

      Umbert Juliana, Anna; Díaz Romero, M. del Pilar (Institute of Electrical and Electronics Engineers (IEEE), 2000)
      Text en actes de congrés
      Accés obert
      Currently, we are involved in the standardisation process to specify the next mobile system generation. A wideband code division multiple access (WCDMA) system is considered in most of the region versions. It would be very ...

    • A hybrid-arq system for hf channels based on codeword partitioning 

      Serrat Fernández, Juan; Dalmau, J Royo (1996-04)
      Article
      Accés obert
      A technique by which the codewords of an error-correcting code are partitioned to obtain an error-detecting code with half the original length is described. It is intended to be used in a hybrid-ARQ system for achieving ...

    • A mobile controlled algorithm for improving the throughput in a s-aloha ds-cdma system 

      Sallent Roig, Oriol; Agustí Comes, Ramon (Institute of Electrical and Electronics Engineers (IEEE), 1996)
      Text en actes de congrés
      Accés obert
      This paper presents a novel adaptive DS-CDMA slotted-ALOHA packet random access scheme with transmitter-based spreading codes for mobiles. It is aimed at improving the throughput and message delay delivery when traffic ...

    • A morphological approach for segmentation and tracking of human faces 

      Marqués Acosta, Fernando; Vilaplana Besler, Verónica (Barcelona, 2000)
      Comunicació de congrés
      Accés obert
      A new technique for segmenting and tracking human faces in video sequences is presented. The technique relies on morphological tools such as using connected operators to extract the connected component that more likely ...

    • A near-optimum mac protocol based on the distributed queueing random access protocol (dqrap) for a cdma mobile communication system 

      Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon; Sallent Roig, Oriol (2000-09)
      Article
      Accés obert
      This paper presents and analyses a new near– optimum random access protocol. The proposed access scheme is suitable for a CDMA environment and minimises the total number of spreading codes needed to achieve a certain ...