Now showing items 1-20 of 46

  • A continuously adaptive vector predictive coder (AVPC) for speech encoding 

    Masgrau Gómez, Enrique José; Mariño Acebal, José Bernardo; Vallverdú Bayés, Sisco (Institute of Electrical and Electronics Engineers (IEEE), 1986)
    Conference report
    Open Access
    In this work we present a waveform speech coding system including vector quantization. This system can be seen as a vector version of the scalar ADPCM speech coder. In such system the speech samples are grouped in vectors ...
  • Acoustic cancellation of engine noise by fast adaptive IIR filtering 

    Masgrau Gómez, Enrique José; Rodríguez Fonollosa, José Adrián (Elsevier, 1990)
    Conference report
    Open Access
  • Adaptive Multistage Vector Quantization 

    Rodríguez Fonollosa, José Adrián; Masgrau Gómez, Enrique José (1989)
    Conference report
    Open Access
    The authors present a novel multiple-stage vector-quantization method that allows the adaptation of the quantizer to the signal to be coded. This adaptation is computationally very simple and is made with no increase in ...
  • Adaptive system identification based on higher-order statistics 

    Rodríguez Fonollosa, José Adrián; Masgrau Gómez, Enrique José (1991)
    Conference report
    Open Access
    The problem of estimating the autoregressive (AR) parameters of a causal AR moving average (ARMA) (p,q) process using higher-order statistic is addressed. It is shown that there is always a linear combination of p+1 slices ...
  • Adaptive vector predictive speech coding with sample by sample update at 16 Kbps 

    Masgrau Gómez, Enrique José; Mariño Acebal, José Bernardo (1986)
    Conference report
    Open Access
    A vectorial generalization of the ADPCM system is introduced. Once the speech signal is grouped in vectors, they are coded using a vector predictor (VP) and a vector quantizer (VQ). Both subsystems are continously adaptive; ...
  • A new algorithm for adaptive IIR filtering based on the log-area-ratio parameters 

    Rodríguez Fonollosa, José Adrián; Masgrau Gómez, Enrique José (Elsevier, 1990)
    Conference report
    Open Access
  • APVQ encoder applied to wideband speech coding 

    Salavedra Molí, Josep; Masgrau Gómez, Enrique José (Institute of Electrical and Electronics Engineers (IEEE), 1996)
    Conference report
    Open Access
    The paper describes a coding scheme for broadband speech (sampling frequency 16 KHz). The authors present a wideband speech encoder called APVQ (adaptive predictive vector quantization). It combines subband coding, vector ...
  • A speech enhancement system using higher order ar estimation in real environments 

    Salavedra Molí, Josep; Masgrau Gómez, Enrique José; Moreno Bilbao, M. Asunción (1993)
    Conference report
    Open Access
    We study some speech enhancement algorithms based on the iterative Wiener filtering method due to Lim-Oppenheim [2], where the AR spectral estimation of the speech is carried out using a second-order analysis. But in our ...
  • AVPC-Subband Coding System for Speech Encoding 

    Masgrau Gómez, Enrique José; Mariño Acebal, José Bernardo; Rodríguez Fonollosa, José Adrián; Salavedra Molí, Josep (1987)
    Conference report
    Open Access
    The combination of Vector Quantization (VQ) and predictive techniques -named AVPC systems- has been shown as interesting systems for speech waveform coding at medium-high rates (ref. 1 to 3). In this work we present a such ...
  • Codificación APVQ de voz en banda ancha para velocidades entre 16 y 32 KBPS 

    Salavedra Molí, Josep; Masgrau Gómez, Enrique José (1996)
    Conference report
    Open Access
    This paper describes a coding scheme for broadband speech (sampling frequency 16KHz). We present a wideband speech encoder called APVQ (Adaptive Predictive Vector Quantization). It combines Subband Coding, Vector Quantization ...
  • Codificación APVQ-extendida de voz de banda ancha 

    Masgrau Gómez, Enrique José; Salavedra Molí, Josep (1994)
    Conference report
    Open Access
    This paper describes a coding scheme for broadband speech. It can be seen as a vectorial extension of an conventional ADPCM encoder. In this scheme, the vector signal is formed with one sample of the normalizaed prediction ...
  • Cohn's filters with parallel-coupled transmission lines and no discontinuities 

    Mariño Acebal, José Bernardo; de los Reyes, Elías; Masgrau Gómez, Enrique José (Warsaw University of Technology, 1980)
    Conference report
    Open Access
    A new method for designing Cohn's parallel-coupled transmission-line filters is introduced. This method is particularly well suited to obtain designs without discontinuities in the junction of the different transmission ...
  • 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. ...
  • Cuantificación vectorial adaptativa de la voz 

    Rodríguez Fonollosa, José Adrián; Masgrau Gómez, Enrique José; Carbonell, Rafael M. (1989)
    Conference report
    Open Access
    Vector quantization (VQ) is a simultaneous quantization of a sequence of samples or vector. This process allows to malee effective use of the interrelations among the different vector components and performance arbitrarily ...
  • Design of bandstop filters by reactance transformation 

    Mariño Acebal, José Bernardo; Nadeu Camprubí, Climent; Masgrau Gómez, Enrique José (Institution of Electrical Engineers, 1980-01-31)
    Article
    Open Access
  • Design of digital equalizers with minimax error 

    Mariño Acebal, José Bernardo; Masgrau Gómez, Enrique José; Nadeu Camprubí, Climent (1980)
    Conference report
    Open Access
    A new method for designing digital equalizers with simultaneous specification of magnitude and phase is introduced. The approximation is carried out using minimax error criteria. The method is eficient in iterations number ...
  • Evaluación de las características de adquisión y seguimiento de arrays adaptativos 

    Masgrau Gómez, Enrique José; Lagunas Hernandez, Miguel A. (Fundación Universidad-Empresa, 1986)
    Conference report
    Open Access
    En el presente trabajo se lleva a cabo un estudio comparativo de varios algoritmos para arrays adaptativos en el contexto de comunicaciones marinas vía satélite. Los algoritmos considerados pertenecen a dos grandes grupos ...
  • Filtros en el dominio de la frecuencia 

    Mariño Acebal, José Bernardo; Masgrau Gómez, Enrique José; Nadeu Camprubí, Climent; Serra, Miquel; Carol Vilanova, Antonio (1985)
    Book
    Open Access
  • Improved convergence of gradient algorithms for adaptive IIR filters 

    Rodríguez Fonollosa, José Adrián; Masgrau Gómez, Enrique José (Institute of Electrical and Electronics Engineers (IEEE), 1989)
    Conference report
    Open Access
    The introduction of a simple correction term in gradient algorithms for adaptive IIR filtering is shown to improve their convergence and robustness. The error surface, i.e. the mean-squared value of the output error as a ...
  • Including Zeros in the Backward Adaptive Predictor of AVPC Coders 

    Masgrau Gómez, Enrique José; Rodríguez Fonollosa, José Adrián (1989)
    Conference report
    Open Access
    The inclusion of a pole-zero vector predictor in the backward loop of an AVPC coder[1] is approached . We hope to reach the same profit shown by the pole-zero predictor in the ADPCM-CCITT standard. By using a VLMS transversal ...