Download Techniques for Noise Robustness in Automatic Speech by Tuomas Virtanen PDF

By Tuomas Virtanen

Automated speech popularity (ASR) platforms are discovering expanding use in lifestyle. the various average environments the place the platforms are used are noisy, for instance clients calling up a voice seek process from a hectic cafeteria or a highway. this may bring about degraded speech recordings and adversely have an effect on the functionality of speech reputation structures. because the use of ASR platforms raises, wisdom of the cutting-edge in ideas to accommodate such difficulties turns into serious to process and alertness engineers and researchers who paintings with or on ASR applied sciences. This publication provides a entire survey of the state of the art in concepts used to enhance the robustness of speech attractiveness platforms to those degrading exterior affects.

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The digitizing channel includes zero or more analog transmission channels, analog-todigital conversion, and zero or more digital transmission channels. Our definition of digital transmission channels include storage and retrieval schemes that may incorporate compression. The actual combination of analog and digital transmission channels depends on the particular application in which ASR is deployed. , the number and type of analog and digital transmission channels between the speaker and the recognizer, is known.

I The state index qˆT −1 of the most likely sequence at time T − 1 is obtained as qˆT −1 = argmax δT −1 (i). i The entire state sequence for times t = T − 2, T − 3, . . , 0 is obtained by backtracking as qˆt = ψt+1 (ˆ qt+1 ). 21) The above procedure, known as the Viterbi Algorithm [5,13], forms the basis for the search employed in ASR systems as we shall see later. 3 19 Learning HMM Parameters The above sections described how to determine various probabilities, and how to identify the most likely state sequence to explain an observation sequence when all HMM parameters are known.

Therefore, we must factor the problem. , the set of words it can recognize, is finite, although the words can compose infinitely many word sequences. Therefore, we only learn HMMs for the words that the system can recognize. 4. 9 Illustrating the composition of HMMs for word sequences from the HMMs for smaller units. Here, the HMMs for the words “SING” and “SONG” are composed from the HMMs for the phonemes /S/, /IH/, /AO/, and /NG/. 7. itself is so large that it may not be possible to train HMMs for all the words in it.

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