Ara es mostren els items 1-20 de 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)
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      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 ...
    • A new algorithm for adaptive IIR filtering based on the log-area-ratio parameters 

      Rodríguez Fonollosa, José Adrián; Masgrau Gómez, Enrique José (Elsevier, 1990)
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    • A speech enhancement system using higher order ar estimation in real environments 

      Salavedra Molí, Josep; Masgrau Gómez, Enrique José; Moreno Bilbao, M. Asunción (1993)
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      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 ...
    • Acoustic cancellation of engine noise by fast adaptive IIR filtering 

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

      Rodríguez Fonollosa, José Adrián; Masgrau Gómez, Enrique José (1989)
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      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)
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      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)
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      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; ...
    • APVQ encoder applied to wideband speech coding 

      Salavedra Molí, Josep; Masgrau Gómez, Enrique José (Institute of Electrical and Electronics Engineers (IEEE), 1996)
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      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 ...
    • AVPC-Subband Coding System for Speech Encoding 

      Masgrau Gómez, Enrique José; Mariño Acebal, José Bernardo; Rodríguez Fonollosa, José Adrián; Salavedra Molí, Josep (1987)
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      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)
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      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)
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      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)
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      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)
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      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)
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      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)
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    • Design of digital equalizers with minimax error 

      Mariño Acebal, José Bernardo; Masgrau Gómez, Enrique José; Nadeu Camprubí, Climent (1980)
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      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)
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      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)
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    • 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)
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      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)
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      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 ...