Centro de Investigaciones de la Informática (CII)
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Examinando Centro de Investigaciones de la Informática (CII) por Autor "Ferrer-Riesgo, Carlos A."
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Ítem Acceso Abierto Bidirectional Alignment of Glottal Pulse Length Sequences for the Evaluation of Pitch Detection Algorithms(2019-10-28) Ferrer-Riesgo, Carlos A.; Rodriguez-Guillen, Reinier; Nöth, Elmar; Universidad Central "Marta Abreu" de Las Villas. Departamento de Telecomunicaciones y Electronica; Universidad Central "Marta Abreu" de Las Villas. Laboratorio de PDSI adjunto a Centro de Estudios de la Informatica; Friedrich Alexander University Erlangen-NuembergThis paper describes a problem in a reported Dynamic Time Warping (DTW) alignment procedure to compare the reference and detected glottal pulse length sequences, oriented to compare the evaluation of Pitch Detection Algorithms (PDAs) in pathological voices. The problem in the existing alignment method tends to overestimate the failure of the PDA, by aligning only the detected to the reference sequence. A solution is presented, which performs a bidirectional alignment reducing the differences present in the definitive comparison. The proposal is evaluated in both synthetic and real voice signals, by running three well-known PDAs, and the magnitude of the error reduction along with comments on the possible factors influencing its value, are given. The alignment variant introduced in this paper allows to perform a fairer comparison of the PDAs performances.Ítem Acceso Abierto Jitter as the main affecting factor in the performance of PDAs(2019-06-23) Rodriguez-Guillen, Reinier; Ferrer-Riesgo, Carlos A.; Universidad Central "Marta Abreu" de Las Villas. Departamento de Telecomunicaciones y Electronica; Universidad Central "Marta Abreu" de Las Villas. Laboratorio de PDSI adjunto a Centro de Estudios de la InformaticaJitter measurement is a frequent task in the acoustic analysis of pathological voices, and it relies in the previous determination of glottal pulse boundaries. The Praat software system has become a widely used tool to obtain both the pulse boundaries and the jitter measures. However, results provided by Praat can be misleading if the internal implementations of the procedures used to obtain the pulse boundaries are ignored. This paper addresses the influence of some of these settings in the ability of Praat to obtain these markers. Simulations are conducted to evaluate the effects of different types of periodicity perturbations (jitter, shimmer, noise, and their combination) and their levels on the resulting performance.Ítem Acceso Abierto Measuring Periodicity Perturbations in Pathological Voice: General-Purpose Software vs. Custom-Tailored Methods(2019-10-02) Rodriguez-Guillen, Reinier; Ferrer-Riesgo, Carlos A.; Universidad Central "Marta Abreu" de Las Villas. Departamento de Telecomunicaciones y Electronica; Universidad Central "Marta Abreu" de Las Villas. Laboratorio de PDSI adjunto a Centro de Estudios de la InformaticaThe acoustic measurement of the severity of the symptoms present in pathological voice is an active research area, for being inexpensive and non invasive. Periodicity perturbations are among the most frequently used, requiring the previous extraction of the individual glottal pulse boundaries. In this paper we explore the performances of methods for detecting glottal pulse boundaries as implemented by freely available software (Praat, intended for phonetic studies) vs. a research-grade pulse cycle detector (reported as a super-resolution method). We compare the sequences of pulse markers as obtained by two of Praat’s internal implementations and the super-resolution method against the hand-marked reference sequence in a dataset of pathological sustained vowels from a well-known database. A group of performance measures is extracted from this comparison, using a Dynamic-Time Warping alignment procedure. The measures obtained show the pros and cons of each alternative. Researchers and clinicians must be aware of the benefits of selecting either approach.