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SVMs for Automatic Speech Recognition: A Survey

  • Chapter
Progress in Nonlinear Speech Processing

Part of the book series: Lecture Notes in Computer Science ((LNIP,volume 4391))

Abstract

Hidden Markov Models (HMMs) are, undoubtedly, the most employed core technique for Automatic Speech Recognition (ASR). Nevertheless, we are still far from achieving high-performance ASR systems. Some alternative approaches, most of them based on Artificial Neural Networks (ANNs), were proposed during the late eighties and early nineties. Some of them tackled the ASR problem using predictive ANNs, while others proposed hybrid HMM/ANN systems. However, despite some achievements, nowadays, the preponderance of Markov Models is a fact.

During the last decade, however, a new tool appeared in the field of machine learning that has proved to be able to cope with hard classification problems in several fields of application: the Support Vector Machines (SVMs). The SVMs are effective discriminative classifiers with several outstanding characteristics, namely: their solution is that with maximum margin; they are capable to deal with samples of a very higher dimensionality; and their convergence to the minimum of the associated cost function is guaranteed.

These characteristics have made SVMs very popular and successful. In this chapter we discuss their strengths and weakness in the ASR context and make a review of the current state-of-the-art techniques. We organize the contributions in two parts: isolated-word recognition and continuous speech recognition. Within the first part we review several techniques to produce the fixed-dimension vectors needed for original SVMs. Afterwards we explore more sophisticated techniques based on the use of kernels capable to deal with sequences of different length. Among them is the DTAK kernel, simple and effective, which rescues an old technique of speech recognition: Dynamic Time Warping (DTW). Within the second part, we describe some recent approaches to tackle more complex tasks like connected digit recognition or continuous speech recognition using SVMs. Finally we draw some conclusions and outline several ongoing lines of research.

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Authors and Affiliations

  1. Signal Theory and Communications Department, EPS-Universidad Carlos III de Madrid, Avda. de la Universidad, 30, 28911-Leganés (Madrid), Spain

    R. Solera-Ureña, J. Padrell-Sendra, D. Martín-Iglesias, A. Gallardo-Antolín, C. Peláez-Moreno & F. Díaz-de-María

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  1. R. Solera-Ureña
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  2. J. Padrell-Sendra
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  3. D. Martín-Iglesias
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  4. A. Gallardo-Antolín
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  5. C. Peláez-Moreno
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  6. F. Díaz-de-María
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Yannis Stylianou Marcos Faundez-Zanuy Anna Esposito

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Solera-Ureña, R., Padrell-Sendra, J., Martín-Iglesias, D., Gallardo-Antolín, A., Peláez-Moreno, C., Díaz-de-María, F. (2007). SVMs for Automatic Speech Recognition: A Survey. In: Stylianou, Y., Faundez-Zanuy, M., Esposito, A. (eds) Progress in Nonlinear Speech Processing. Lecture Notes in Computer Science, vol 4391. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-71505-4_11

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  • DOI: https://doi.org/10.1007/978-3-540-71505-4_11

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