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Low bit rate voice encoders
Leitner, Jakub ; Mačák, Jaromír (referee) ; Pust, Radim (advisor)
The final thesis deals with coders and voice coders used in speech signal processing. The aim is to create an integral overview of coders and voice coders including a description of their properties, in the second part of the thesis a simulation of algorithms and methods of speech processing is performed in Matlab Simulink program.The basic methods of speech processing and a parametric LPC voice coder were simulated in time domain. In the LPC voice coder model there are implemented the algorithms for obtaining speech segment parameters. These are the algorithm for classification of voiced and unvoiced speech segment, LPC analysis and pitch detection. The output is a parametric signal that enables a receiver to synthesize a speech signal. The appendix 1 contains a list of names of coders or standard numbers of coders and their properties, the appendix 2 includes an overview of speech processing methods.
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Gate Unlocking by Voice
Bauer, Jan ; Pešán, Jan (referee) ; Schwarz, Petr (advisor)
The aim of this BSc. thesis is to create a device for authentication based on human voice. The solution is based on the BSAPI speech processing library developed by Phonexia. The library written in C++ was ported to the Raspberry Pi B+ device. The core functionality of the application was implemented in a Python script. The resulting solution is certainly interesting and may become a reliable security system in near future.
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Analysis of Formant Areas During Sung Vowels
Kukosa, František ; Švancara, Pavel (referee) ; Jirásek, Ondřej (advisor)
The study analyzes the formant zones of male voices in singing vowels with main focus on opera, chest and head vocal registers. The results of this work are based on the recordings of five singers, taken in an anechoic chamber. For the analysis of these recordings in the frequency domain were used the FFT algorithm and the LPC analysis. The results describe the nature of the individual registers and show the importance of the singing formants for singers. Especially for opera vocal register where the vocal formants, along with a natural vibrato technique, are very important.
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Finite element modelling of voice propagation through the vocal tract and around the human head
Tomeček, Vojtěch ; Pellant, Karel (referee) ; Švancara, Pavel (advisor)
This diploma thesis deals with creating of finite element model for the analysis of acustic waves radiation through human vocal tract and through the head surrounding space. The thesis contains a short overview of the anatomy of relevant parts and a short overview of formerly published models relevant to the topic. Then the process of creating the 3D model of human head, including the vocal tract, based on CT scans, and the mesh itself follows. This is succeeded by the computational solution taking in the acount the acoustic absorption of the vocal tract walls and radiation into the open space. The results gained are compared to relevant literature on this topic. The changes in frequency spectra in specific nodes of the mesh are reviewed and compared to relevant literature on the topic. The results could be used as basis of eventual frequention corrections of microphones used for voice diagnosis or registration in general, eg of speach or singing.
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Voice Conversion
Schwarz, Ivan ; Szőke, Igor (referee) ; Černocký, Jan (advisor)
Thesis is dedicated to the making of a system for voice conversion. To methods, which alter voice of one person in a way, that it could be possible for listener to mislead it for someone elses voice. In the first part, Harmonic plus Noise Model (HNM) is described. Signal analysis and synthesis are its main purposes. Methods of voice conversion are considered in the second part. Prosodic modifications are introduced at first and then modification of a spectral envelope is discussed (Especially aplication of conversion matrices). Dynamic Time Warping (DTW) and Linear Prediction Coding (LPC) methods are explained briefly. In last section, implementation process is described and achived results are discussed. Ways of further development are suggested in summary.
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Choirs in Prachatice
SKOBOVÁ, Denisa
The bachelor thesis deals with choirs in Prachatice. It theoretically describes the choirs, presents their history, types of choirs and the personality of the choirmaster. It also deals with vocal defects and voice disorders and related vocal hygiene. In the next part of the work it describes the history of Prachatice and its development. Finally, the thesis deals with the choirs in Prachatice, focusing on their history, current activities, choirmasters and the repertoire of the choirs.
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Community singing as a possibility of active leisure in Jindřichův Hradec
SVOBODOVÁ, Vladimíra
This bachelor's thesis deals with community singing as a possible leisure activity in Jindřichův Hradec. It theoretically describes free time and its use, the beginnings of spiritual and secular music. It characterizes choirs, singing voice and the role of a choirmaster. Furthermore, the thesis describes choirs in Jindřichův Hradec as a possible leisure activity. It deals with their history, current activities, choirmasters, choristers and the singing repertoire of specific choirs. Contribution of choral singing is also mentioned in the thesis.
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Possibilities of physiotherapy for functional disorders caused by vocal loading in singers
BÁRTOVÁ, Kateřina
This bachelor thesis is focused on the possibilities of physiotherapy for functional disorders from excessive vocal load in singers. Functional disorders caused by excessive vocal load are a very common, but also neglected issue of voice. These disorders are caused by a frequent overuse of the vocal cords by speech and singing voice, mainly due to a poor voice technique. Functional voice disorders occur in voices of the untrained, but also in voices of the profesionals. If vocal overload is not treated, phonaesthenia, hyperkinetic dysphonia or hypokinetic dysphonia may occur. If the patient is not getting treated even in this case, irreversible organic changes in their vocal system may occur. In functional vocal disorders, there is a dyscoordination of different parts of the vocal tract, hyperactivity of the exhalatory muscles, extra-laryngeal muscles, and vocal cord adductors. The treatment of functional disorders from excessive vocal load consists in the elimination of the primary causes. Re-education of the voice with the help of voice exercise and re-education of the related body system is important. The aim of this paperis to map the possibilities of physiotherapy for functional disorders from excessive vocal load in singers and to design an exercise unit as a prevention of functional vocal disorders. In the theoretical part, the bachelor thesis deals with the voice, the anatomy of the vocal system and its function. There are described functional voice disorders, their causes, and methods of treatment. Furthermore, the bachelor's thesis focuses on the description of physiotherapy options that can be used for functional disorders from excessive vocal load. The practical part of the bachelor thesis is divided into two parts. The first part is processed in the form of qualitative research. The research sample consists of two singers with repeated problems of overloaded vocal cords. The sample underwent an input and output kinesiological analysis and the design of the therapy was created according to the identified issues. The therapy had positive impact on both patients and helped their improvement. The second part is processed in quantitative form. The research sample consists of 100 amateur and professional singers who filled out a questionnaire focused on the education of respondents in the field of singing, their subjective opinion on the correct performance of singing, questions on vocal disorders and methods of their treatment. The questionnaire contains, as well, a short subjective test of vocal overload. The questionnaire maps singers' awareness and the incidence of vocal disorders among those surveyed. According to the results of the questionnaire, it can be stated that the education of singers is still insufficient. In accordance with the results of the questionnaire, a handbook for singers was compiled in order to prevent voice disorders with the help of prevention and to inform singers about functional voice disorders.
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Demands of the Teacher's Proffesion on the Teachers' Voice
Králová, Michaela ; Tichá, Alena (advisor) ; Koverdynský, Luděk (referee)
This dissertation thesis deals with the demands on teachers' voice and proper use of voice in the teacher's profession. The whole thesis consists of two parts: theoretical and practical. The theoretical part is divided into nine sections: the anatomy and physiology of the vocal tract, voice developement, comparison of spoken and singing voice, psychological impact on voice, voice defects and hygiene, voice reeducation, methods of voice diagnostics and voice acoustics. The research part presents the findings of acoustic voice measurement. Students (only women) of Faculty of Education in Prague participed in the research. The objective of this part was to asses the quality of students' voice and their voice readiness for future teaching.
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Vocal and Voice Disorders
Gerasimova, Olga ; Tichá, Alena (advisor) ; Volavá, Iva (referee)
This thesis deals with vocal and voice disorders and draws on czech and russian authors. The theoretical part consists of a survey of disorder classification by czech and russian voice pedagogues, phoniatricians, physicians and speech therapists. Practical part is focused on vocal hygiene and on description and examples of practical drills, suitable for prevention and therapy of vocal and voice disorders. In the end there are given several musical notation excercises that are applicable to voice training and therapy.
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