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dc.contributor.advisorBrena Pinero, Ramón Felipe
dc.creatorValdiviezo Mora, José Aristh
dc.identifier.citationValdiviezo, J.A. (2019). Identification of Pronunciation Errors in L2 English Speech by Spanish Speaking Natives for S-Impure Sounds (Master's Thesis)es_MX
dc.description.abstractIn the field of Computer-Aided Pronunciation Training (CAPT) systems, there are several approaches to detect pronunciation errors. Among those, the cutting-edge in the past years has been Deep Neural Networks (DNN), but this approach is generally only feasible when a high quantity and quality of data are available. In this project, a big database was not available. For that reason a dataset of 1953 audio files was sampled and collected; however a database of this size is considered small and not entirely suitable for a DNN model. Therefore classical supervised learning techniques were revised, applied and tested in this work. The main goal was to identify the pronunciation errors of native Spanish speakers at pronouncing S-impure words. The database build from the 1953 tagged audios was binary classified by three independent judges to identify those recordings that have an S-impure error and later processed to extract key features, Mel Frequency Cepstral Coefficients (MFCC), Spectral-Flux (SF), Root Mean Square Energy (RMSE) and Zero-Crossing (ZR) to train with a K-Nearest Neighbors (KNN), Random Forest (RF) and Support Vector Machine (SVM) algorithms. The resulting model obtained with SVM using the grid-search technique for tuning Hyperparameters provided the best solution. The obtained results show that the model was able to detect errors with an accuracy of 85% which leads to a solid result given that the dataset had high noise levels.es_MX
dc.publisherInstituto Tecnológico y de Estudios Superiores de Monterreyesp
dc.relation.isFormatOfversión publicadaes_MX
dc.rightsOpen Accesses_MX
dc.rightsAtribución-NoComercial-CompartirIgual 4.0 Internacional*
dc.titleIdentification of Pronunciation Errors in L2 English Speech by Spanish Speaking Natives for S-Impure Soundses_MX
dc.typeTrabajo de grado, Maestría / master Degree Workes_MX
dc.contributor.committeememberSoto Rodríguez, Rogelio
dc.contributor.committeememberÁvila Rodríguez, Luis Alberto
dc.contributor.committeememberDe León Flores, Román
dc.publisher.institutionInstituto Tecnológico y de Estudios Superiores de Monterreyes_MX
dc.subject.keywordCAPT Systemes_MX
dc.subject.keywordPronunciation Errores_MX
dc.contributor.institutionCampus Monterreyes_MX
dc.description.degreeMaster of Science in Intelligent Systemses_MX
dc.audience.educationlevelPúblico en general/General publices_MX

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