Download e-book for kindle: Distant speech recognition by Dr Matthias Woelfel, Dr. John McDonough

By Dr Matthias Woelfel, Dr. John McDonough

ISBN-10: 0470517042

ISBN-13: 9780470517048

ISBN-10: 0470714085

ISBN-13: 9780470714089

A whole evaluate of far-off automated speech reputation

The functionality of traditional computerized Speech acceptance (ASR) platforms degrades dramatically once the microphone is moved clear of the mouth of the speaker. this can be because of a vast number of results reminiscent of history noise, overlapping speech from different audio system, and reverberation. whereas conventional ASR platforms underperform for speech captured with far-field sensors, there are many novel innovations in the acceptance method in addition to thoughts constructed in different parts of sign processing which can mitigate the deleterious results of noise and reverberation, in addition to keeping apart speech from overlapping audio system.

far away Speech attractiveness provides a modern and accomplished description of either theoretic abstraction and sensible matters inherent within the far away ASR challenge.

Key positive aspects:

  • Covers the whole subject of far-off ASR and provides useful suggestions to beat the issues concerning it
  • Provides documentation and pattern scripts to let readers to build state of the art far-off speech attractiveness platforms
  • Gives proper history details in acoustics and filter out suggestions,
  • Explains the extraction and enhancement of category proper speech gains
  • Describes greatest probability in addition to discriminative parameter estimation, and greatest probability normalization strategies
  • Discusses using multi-microphone configurations for speaker monitoring and channel mix
  • Presents a number of purposes of the equipment and applied sciences defined during this e-book
  • Accompanying web site with open resource software program and instruments to build cutting-edge far-off speech reputation structures

This reference should be a useful source for researchers, builders, engineers and different execs, in addition to complicated scholars in speech know-how, sign processing, acoustics, records and synthetic intelligence fields.

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Additional info for Distant speech recognition

Sample text

The periodicity of voiced speech gives rise to a spectrum containing harmonics nf0 of the fundamental frequency for integer n ≥ 1. These harmonics are known as partials. 3 Block diagram of the simplified source filter model of speech production observed over an infinite interval, will have a discrete-line spectrum, but voiced sounds are only locally quasi-periodic. The spectra for unvoiced speech range from a flat shape to spectral patterns lacking low-frequency components. The variability is due to place of constriction in the vocal tract for various unvoiced sounds, which causes the excitation energy to be concentrated in different spectral regions.

The gradual movement of the vocal tract articulators, however, results in speech that is quasi-stationary over short segments of 5–25 ms. 1. The classification of speech into voiced and unvoiced segments is in many ways more important than other classifications. The reason for this is that voiced and unvoiced classes have very different characteristics in both the time and frequency domains, which may warrant processing them differently. As will be described in the next section, speech recognition requires classifying the phonemes with a still finer resolution.

A particular subset of fricatives are the sibilants, which are characterized by a hissing sound produced by forcing air over the sharp edges of the teeth. Sibilants have most of their acoustic energy at higher frequencies. An example of a voiced sibilant is /z/ such as in “zeal”, an unvoiced sibilant is /s/ such as in “seal”. Nonsibilant fricatives are, for example, /v/ such as in “vat”, which is voiced and /f/ such as in “fat”, which is unvoiced. , [j] as in “yes” [jes] and [î] as in Japanese “watashi” [îataCi], pronounced with lip compression.

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Distant speech recognition by Dr Matthias Woelfel, Dr. John McDonough

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