Now showing items 1-20 of 29

    • 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 ...
    • 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 ...
    • 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 ...
    • Bandwidth extension of narrowband speech 

      Expósito Pérez, Miquel; Salavedra Molí, Josep (Universidad Politécnica de Valencia, 2014)
      Conference report
      Open Access
      Recently, 4G mobile phone systems have been designed to process wideband speech signals whose sampling frequency is 16 kHz. However, most part of mobile and classical phone network, and current 3G mobile phones, still ...
    • 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 de voz en banda ancha usando asignación dinámica de bits 

      Salavedra Molí, Josep (Universidad de Valladolid, 1995)
      Conference report
      Open Access
      This paper describes a coding scheme for broadband speech. It can be seen as a vectorial extension of a conventional ADPCM encoder. In this scheme, signal vector is formed with one sample of the normalized prediction error ...
    • 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 ...
    • 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. ...
    • Demisyllable-based HMM spotting for continuous speech recognition 

      Lleida Solano, Eduardo; Nadeu Camprubí, Climent; Mariño Acebal, José Bernardo; Salavedra Molí, Josep (Institute of Electrical and Electronics Engineers (IEEE), 1991)
      Conference report
      Open Access
      The authors describe the acoustic processor of a Spanish continuous speech recognition system based on demisyllable units. The acoustic processor is based on a spotting algorithm which takes as input the unknown utterance, ...
    • Distortion effects of several cumulant-based wiener filtering algorithms 

      Salavedra Molí, Josep (1999)
      Conference report
      Open Access
      Some Single-Microphone Speech Enhancement algorithms based on the iterative Wiener filtering Method due to Lim-Oppenheim [2] are evaluated. In the original Lim-Oppenheim algorithm, AR spectral estimation of speech is carried ...
    • Jornada de Docència 2017 

      Daza Fernandez, Vanesa; Pascual Gainza, Pere; Carmona Mejías, Ángeles; Salavedra Molí, Josep; Barrera, Marc de la; Sáez Moreno, Germán; Saludes Closa, Jordi; Antonijuan Rull, Josefina; Prat Farran, Joana d'Arc (2017-06-27)
      Audiovisual
      Open Access
      9h45 h: Obertura de la jornada 10:00 -11:00 h: Conferència plenària “Estudiants participatius: realitat o ficció” Vanesa Daza (Univ. Pompeu Fabra). Parlarem de diferents experiències portades a terme a l’Escola Superior ...
    • Out-of-vocabulary word modelling and rejection for keyword spotting 

      Lleida Solano, Eduardo; Mariño, José B.; Salavedra Molí, Josep; Bonafonte Cávez, Antonio; Monte Moreno, Enrique (International Speech Communication Association (ISCA), 1993)
      Conference report
      Restricted access - publisher's policy
      This paper presents a combination of out-of-vocabulary (OOV) word modeling and rejection techniques in an attempt to accept utterances embedding a keyword and reject utterances with nonkeywords. The goal of this research ...
    • Predicción lineal de la parte causal de la autocorrelación para la identificación del locutor en ambientes ruidosos 

      Villagrasa, C; Hernando Pericás, Francisco Javier; Nadeu Camprubí, Climent; Salavedra Molí, Josep (1994)
      Conference report
      Open Access
      Recently, a new parametrization technique based on the AR modelling of the one-sided autocorrelation sequence (OSALPC) has shown to be attractive for speech recognition because of its simplicity and its high recognition ...
    • Predicción lineal de la parte causal de la autocorrelación para la identificación del locutor en ambientes ruidosos 

      Hernando Pericás, Francisco Javier; Nadeu Camprubí, Climent; Salavedra Molí, Josep (Universidad de las Palmas de Gran Canaria, 1994)
      Conference lecture
      Open Access
    • Predictive neural networks applied to phoneme recognition 

      Freitag, Fèlix; Monte Moreno, Enrique; Salavedra Molí, Josep (1997)
      Conference report
      Open Access
      In this paper a phoneme recognition system based on predictive neural networks is proposed. Neural networks are used to predict observation vectors of speech frames. The obtained prediction error is used for phoneme ...
    • Robust coefficients of a higher order AR modelling in a speech enhancement system using parameterized Wiener filtering 

      Salavedra Molí, Josep; Masgrau Gómez, Enrique José; Moreno Bilbao, M. Asunción; Estarellas, J; Jove, X (Institute of Electrical and Electronics Engineers (IEEE), 1994)
      Conference report
      Open Access
      We study some speech enhancement algorithms based on the iterative Wiener filtering method due to Lim-Oppenheim (1978), where the AR spectral estimation of the speech is carried out using a second-order analysis. But in ...
    • Robust HOS-based techniques applied to speech recognition and enchancement 

      Salavedra Molí, Josep; Hernando Pericás, Francisco Javier; Masgrau Gómez, Enrique José; Moreno Bilbao, M. Asunción (1995)
      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 ...
    • Robust hos-based techniques applied to speech recognition and enhancement 

      Salavedra Molí, Josep; Hernando Pericás, Francisco Javier; Masgrau Gómez, Enrique José; Moreno Bilbao, M. Asunción (1995)
      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 ...
    • Sistema de mejora de voz usando estimación AR de orden superior en ambientes reales 

      Salavedra Molí, Josep; Jové, X; 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 LimOppenheim, where the AR spectral estimation of the speech is carried out using a second-order analysis. But in our ...
    • Some fast higher order ar estimation techniques applied to parametric wiener filtering 

      Salavedra Molí, Josep; Masgrau Gómez, Enrique José; Moreno Bilbao, M. Asunción; Estarellas, J; Hernando Pericás, Francisco Javier (2004)
      Conference report
      Open Access
      Some Speech Enhancement algorithms based on the iterative Wiener filtering Method due to L1m-Oppenheim [2] are presented. In the original Lim-Oppenheim algorithm, speech AR estimation is carried out using classic second-order ...