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Author: Christian Hacker
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832522581
Category : Computers
Languages : en
Pages : 272
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Book Description
Focus of this work are pattern recognition related aspects of computer assisted pronunciation training (CAPT) for second language learning. An overview of commercial systems shows that pronunciation training is being addressed by the growing field of computer assisted language learning only to a small extend, although in the state-of-the-art section a number of such approaches for automatic assessment can already be presented. In the present thesis different approaches are extended and combined. In particular a large set of nearly 200 pronunciation and prosodic features is developed. By this approach pronunciation scoring is regarded as classification task in high-dimensional feature space. Automatic speech recognition is the basis of most pronunciation scoring algorithms. In this thesis a system is presented, which supports second language learning at school, i.e. the target users are children. For this reason a state-of-the-art speech recognition engine is adapted to children speech, since young speakers are only hardly recognised by automatic systems. Phonetically motivated rules for typical mispronunciation errors are integrated into the system to make it suitable for pronunciation scoring. Evaluating an algorithm for pronunciation assessment is more difficult than simply counting the correctly recognised mistakes, since there exists no objective ground truth. This can be shown by evaluating the annotations of 14 teachers. However, with different measures it can be verified that the accuracy of the system (in comparison with teachers) thoroughly reaches the agreement among teachers. The evaluation is conducted with native German speakers learning English.
Author: Christian Hacker
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832522581
Category : Computers
Languages : en
Pages : 272
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Book Description
Focus of this work are pattern recognition related aspects of computer assisted pronunciation training (CAPT) for second language learning. An overview of commercial systems shows that pronunciation training is being addressed by the growing field of computer assisted language learning only to a small extend, although in the state-of-the-art section a number of such approaches for automatic assessment can already be presented. In the present thesis different approaches are extended and combined. In particular a large set of nearly 200 pronunciation and prosodic features is developed. By this approach pronunciation scoring is regarded as classification task in high-dimensional feature space. Automatic speech recognition is the basis of most pronunciation scoring algorithms. In this thesis a system is presented, which supports second language learning at school, i.e. the target users are children. For this reason a state-of-the-art speech recognition engine is adapted to children speech, since young speakers are only hardly recognised by automatic systems. Phonetically motivated rules for typical mispronunciation errors are integrated into the system to make it suitable for pronunciation scoring. Evaluating an algorithm for pronunciation assessment is more difficult than simply counting the correctly recognised mistakes, since there exists no objective ground truth. This can be shown by evaluating the annotations of 14 teachers. However, with different measures it can be verified that the accuracy of the system (in comparison with teachers) thoroughly reaches the agreement among teachers. The evaluation is conducted with native German speakers learning English.
Author: Florian Hönig
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832545670
Category : Computers
Languages : en
Pages : 264
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Book Description
Worldwide there is a universal need for second language language learning. It is obvious that the computer can be a great help for this, especially when equipped with methods for automatically assessing the learner's pronunciation. While assessment of segmental pronunciation quality (i.,e. whether phones and words are pronounced correctly or not) is already available in commercial software packages, prosody (i.e. rhythm, word accent, etc.) is largely ignored--although it highly impacts intelligibility and listening effort. The present thesis contributes to closing this gap by developing and analyzing methods for automatically assessing the prosody of non-native speakers. We study the detection of word accent errors and the general assessment of the appropriateness of a speaker's rhythm. We propose a flexible, generic approach that is (a) very successful on these tasks, (b) competitive to other state-of-the-art result, and at the same time (c) flexible and easily adapted to new tasks.
Author: Tomás Arias-Vergara
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832555617
Category : Computers
Languages : en
Pages : 276
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Book Description
This book addresses the automatic analysis of speech disorders resulting from a clinical condition (Parkinson's disease and hearing loss) or the natural aging process. For Parkinson's disease, the progression of speech symptoms is evaluated by considering speech recordings captured in the short-term (4 months) and long-term (5 years). Machine learning methods are used to perform three tasks: (1) automatic classification of patients vs. healthy speakers. (2) regression analysis to predict the dysarthria level and neurological state. (3) speaker embeddings to analyze the progression of the speech symptoms over time. For hearing loss, automatic acoustic analysis is performed to evaluate whether the duration and onset of deafness (before or after speech acquisition) influence the speech production of cochlear implant users. Additionally, articulation, prosody, and phonemic analyses show that cochlear implant users present altered speech production even after hearing rehabilitation.
Author: Juan Rafael Orozco-Arroyave
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832543619
Category : Medical
Languages : en
Pages : 146
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Book Description
The analysis of speech of people with Parkinson's disease is an interesting and highly relevant topic that has attracted the research community during several years. The advances in digital signal processing and pattern recognition have motivated the research community to work on the development of computational tools to perform automatic analysis of speech. Most of the contributions on this topic are focused on sustained phonation of vowels and only consider recordings of one language. This thesis addresses two problems considering recordings of sustained phonations of vowels and continuous speech signals: (1) the automatic classification of Parkinson's patients vs. healthy speakers, and (2) the prediction of the neurological state of the patients according to the motor section of the Unified Parkinson's Disease Rating Scale (UPDRS). Recordings of three languages are considered: Spanish, German, and Czech. German and Czech data were provided by other researchers, and Spanish data were recorded in Medellin, Colombia, during the development of this work. Besides the classical approaches to assess pathological speech, a new method to model articulation deficits of Parkinson's patients is proposed. This new articulation modeling approach shows to be more accurate and robust than others to discriminate between Parkinson's patients and healthy speakers in the three considered languages.
Author: Muhammad Hassan Khan
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832548076
Category : Computers
Languages : en
Pages : 162
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Book Description
An automatic recognition of human activities enables their use in several interesting applications of daily life. This dissertation emphases on the analysis of human activities in a visual surveillance scenario and the classification of physical activities in the therapeutic procedure using visual data. The first part of the dissertation proposes a robust gait representation to recognise the identity of a person using his/her walking style, dealing with its several real world challenges as well as taking into consideration the effects of cross-view recognition. In the second part, a complete framework is proposed to capture and analyse the movement of different body parts in human which is useful in the clinical assessment to detect any movement disorders and the assessment of the desired therapeutic program.
Author: Zeyd Boukhers
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832545832
Category : Computers
Languages : en
Pages : 160
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Book Description
The present dissertation addresses the problem of extracting 3D trajectories of objects from 2D videos. The reason of this is the theory that these trajectories symbolise high-level interpretations of human activities. A 3D trajectory of an object means its sequential positions in the real world over time. To this end, a generic framework for detecting objects and extracting their trajectories is proposed. In simpler terms, it means obtaining the 3D coordinate of the objects detected on the image plane and then tracking them in the real world to extract their 3D trajectories. Lastly, this dissertation presents applications of trajectory analysis to understand human activities in crowded environments. In this context, each phase in the framework represents independent approaches dedicated to solving challenging tasks in computer vision and multimedia.
Author: Chris Schwemmer
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832549374
Category : Medical
Languages : en
Pages : 157
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Book Description
Cardiovascular disease has become the number one cause of death worldwide. For the diagnosis and therapy of coronary artery disease, interventional C-arm-based fluoroscopy is an imaging method of choice. While these C-arm systems are also capable of rotating around the patient and thus allow a CT-like 3-D image reconstruction, their long rotation time of about five seconds leads to strong motion artefacts in 3-D coronary artery imaging. In this work, a novel method is introduced that is based on a 2-D-2-D image registration algorithm. It is embedded in an iterative algorithm for motion estimation and compensation and does not require any complex segmentation or user interaction. It is thus fully automatic, which is a very desirable feature for interventional applications. The method is evaluated on simulated and human clinical data. Overall, it could be shown that the method can be successfully applied to a large set of clinical data without user interaction or parameter changes, and with a high robustness against initial 3-D image quality, while delivering results that are at least up to the current state of the art, and better in many cases.
Author: Mellissa Bortz
Publisher: Taylor & Francis
ISBN: 1040137806
Category : Medical
Languages : en
Pages : 518
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Book Description
For decades, the speech-language therapy profession has expressed the need for the development of language assessment materials in languages other than English for children and adults. A Guide to Global Language Assessment: A Lifespan Approach aims to meet this need by providing comprehensive information about how to assess the language of bi- and multilingual and culturally diverse clients across the world. Featuring the viewpoints of contributors from around the world, A Guide to Global Language Assessment also boasts a complete database of available global language assessments. What’s included in A Guide to Global Language Assessment: Case studies, assessment frameworks, and resources for conducting global language assessments for culturally and linguistically diverse populations An array of language assessment methods across a continuum such as ethnographic and dynamic assessments, narratives, and standardized language assessment Methods for developing local norms A Guide to Global Language Assessment: A Lifespan Approach is an essential tool for empowering current and future speech-language therapists, professors, and researchers to address global language assessment across the lifespan.
Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
ISBN: 0309388759
Category : Medical
Languages : en
Pages : 305
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Book Description
Speech and language are central to the human experience; they are the vital means by which people convey and receive knowledge, thoughts, feelings, and other internal experiences. Acquisition of communication skills begins early in childhood and is foundational to the ability to gain access to culturally transmitted knowledge, organize and share thoughts and feelings, and participate in social interactions and relationships. Thus, speech disorders and language disorders-disruptions in communication development-can have wide-ranging and adverse impacts on the ability to communicate and also to acquire new knowledge and fully participate in society. Severe disruptions in speech or language acquisition have both direct and indirect consequences for child and adolescent development, not only in communication, but also in associated abilities such as reading and academic achievement that depend on speech and language skills. The Supplemental Security Income (SSI) program for children provides financial assistance to children from low-income, resource-limited families who are determined to have conditions that meet the disability standard required under law. Between 2000 and 2010, there was an unprecedented rise in the number of applications and the number of children found to meet the disability criteria. The factors that contribute to these changes are a primary focus of this report. Speech and Language Disorders in Children provides an overview of the current status of the diagnosis and treatment of speech and language disorders and levels of impairment in the U.S. population under age 18. This study identifies past and current trends in the prevalence and persistence of speech disorders and language disorders for the general U.S. population under age 18 and compares those trends to trends in the SSI childhood disability population.
Author: Marge Blanc
Publisher:
ISBN: 9780615696102
Category : Autistic children
Languages : en
Pages : 304
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Book Description
