Jont B. Allen's Articulation and Intelligibility PDF

By Jont B. Allen

ISBN-10: 1598290088

ISBN-13: 9781598290080

This lecture is a overview of what's recognized approximately modeling human speech reputation (HSR). A version is proposed, and information are verified opposed to the version.

There appear to be lots of theories, or issues of view, on how human speech reputation services, but few of those theories are finished. what's wanted is a suite of versions which are supported via experimental remark, that symbolize how human speech attractiveness rather works. ultimately there's the sensible challenge of creating a computing device recognizer. a technique to do that is to construct a computing device recognizer in accordance with the reversed engineering of human acceptance. This has no longer been the normal method of automated speech reputation (ASR).

What is required is a few perception into why this massive distinction among human functionality and trendy desktop functionality exists. writer Jont Allen addresses this and different questions.

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Humans recognize speech based on a hierarchy of context layers. Humans have an intrinsic robustness to noise and filtering. In fact, the experimental evidence suggests that this robustness does not seem to interact with semantic context (language), as reflected by the absence of feedback in the model block diagram. Their is a long-standing unanswered question: Is there feedback from the back end to the front end? 3 assumes that events are INTRODUCTION 19 extracted from the cochlear output in frequency regions (up to, say, the auditory cortex), and then these discrete events are integrated by a noiseless state machine representing the cerebral cortex.

Going from 5 to 25 isolated words (test 1–3) causes a 4 dB SNR reduction in performance at the 50% correct level. Presenting the 25 words as pseudo-sentences, that make no sense (test 4), has no effect on Pc (SNR). However, adding a grammar (test 2) to a 25 word test returns the score to the 5 word test. In summary, increasing the test size from 5 to 25 words reduces performance by 4 dB. Making 5 word grammatically correct sentences out of the 25 words restores the performance to the 5 word low entropy case.

To appreciate and understand these tools intuitively we need a brief introduction to some practical issues in modeling articulation and intelligibility with probability theory. In the next section three key topics are discussed: entropy, channel capacity, and probability composition laws. Chance performance plays its largest role at very low SNRs, where all of the signal channels have error 1. Chance may be modeled as a side channel that reduces the error to the maximum entropy condition. Context is modeled using conditional probability, and is most important at high SNRs.

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Articulation and Intelligibility by Jont B. Allen

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