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Identification of Spectral Components Significance
Dulesov, Egor
The purpose of this work is to compare the chosen methods of spectrum estimate and ways of identification of spectral components for realization to detect the stress in voice signal. Based on learning the special literature chooses the suitable methods of spectrum estimate. Determines an expected form and thresholds of voice signal in stress situation.
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The Spectrum analysis of different types of saxophones
Greiplová, Barbora ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
The bachelor thesis deals with the sound of three types of Yamaha saxophones, specifically soprano, alto and tenor saxophone. Lists the basic parameters of the instrument, how it forms the tone and how it is typical. It focuses on characteristics in its tone using spectral analysis, LPC analysis and directional characteristics. The work focuses on the common properties of saxophones as instruments, it also looks for differences between selected types of saxophones and between individual tones. The results are compared in graphs, tables and verbal evaluation.
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Detection of alcohol in speech signal
Kupka, Petr ; Holčík, Jiří (referee) ; Sigmund, Milan (advisor)
The diploma thesis Detection of Alcohol in Speech Signal first describes the effect of alcohol on the human body. The second part deals with ways to obtain parameters that describe the speech signal. The third part provides a brief overview of previous case studies and patents focused on the detection of alcohol in the speech signal. The fourth part presents the collected own database of voice recordings and developed software application for the analysis of intoxicated speech. The final part describes the measured changes in speech signal parameters that indicate alcohol intoxication.
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Speech signal processing in spectral domain
Pavlíček, Tomáš ; Šebesta, Vladimír (referee) ; Sigmund, Milan (advisor)
The thesis is focused on getting acquainted with methods of adapting speech signals in spectrum domain and with formants. Fist part is dealing with definition of formant, the relation between Czech language and formants, performing formant features and describing the use of formants in practice. This part includes preprocessing of signals before analysis on its own. This work contains a list of the most common methods for counting speech signals spectrum focused on estimation of spectrum by linear prediction. Practical part contains a verification of the most common methods for specifying formants, which are linear prediction coding and Fourier transformation. Next part is dealing with the description of methods used in created program. It also contains the description of functions of this program and the manual for it. In the end of this work the function of created program is verified and specified database is described.
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Analysis of Spectra of Electric Guitars Made of Various Materials
Zezulová, Eliška ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
Bachelor‘s thesis focuses on the spectral analysis of two electric guitars. The Cort X-6 electric guitar is used for harder genres of music. The second Fokus-H Strat guitar is more of a rock-universal type of instrument. The work deals with the spectrums of tones using various guitar pickups and analyzes them with the use of psychoacoustic measurements in the perception of timbre. It examines variations in the sound spectrum when there’s a manipulation with tone and gain controls. The measured values of the tone control are divided into thirds of the potentiometer range. The volume has been halved. The following is a look at the change of sound spectrum when using a harder plectrum. The end of the work is devoted to the difference in colors of two tones that were recorded under the same conditions. Their difference lies in the way of holding the neck of an electric guitar.
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The analysis of the clarinet spectrum from different manufacturers
Suchánek, Tomáš ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
Bachelor’s thesis focuses on spectral analysis of six B clarinets made by manufacturers Buffet Crampon, RZ Woodwind Manufacturing and Yamaha. Instruments were tested by two professional musicians with different timbral preferences and the resulting spectrum is then applied to how psychoacoustic measurements define timbre perception. Furthermore, the impact of different dynamics or reeds is discussed and significant part of analysis also describes directivity patterns of individual higher harmonics or characteristic formant areas.
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Identification of significant spectral components in speach signal in stress
Dulesov, Egor ; Tučková, Jana (referee) ; Poměnková, Jitka (advisor)
The aim of this master’s thesis is to learn the problem of analysis and identification of significant spectral components in speech signal. Based on learning a special literature chooses the suitable methods of spectrum estimate. Does learning the literature in specification of testing of spectral components significate. Makes a procedure for identification of chosen speech formants. Does this procedure for audio signals both of in stress and in normal state. Estimates the results, compares efficiency of chosen methods and determine threshold for chosen formant of analyzed stress signal. States the recommendations for speech spectral analysis in stress situation.
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Simple text-independent voice lock - speaker verification software system
Kotulek, Milan ; Dolenský,, Jan (referee) ; Staněk, Miroslav (advisor)
A brief introduction into biometrics is described in this thesis leading to description and to design a solution of verification system using speech analysis. The designed system provides firstly basic signal processing, then vowel recognition in fluent Czech speech. For each found vowel, observed speech features are calculated. The created GUI application was tested on created speaker database and its efficiency is approximately 54 % for short testing utterances, and approx. 88 % for long testing utterances respectively.
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Comparison of spectrum and directional dharacteristics of double reed instruments
Cočev, Jiří ; Buzzi, Mario (referee) ; Jirásek, Ondřej (advisor)
The Bachelor's thesis deals with analysis of the sound signals of double reed wind musical instruments. Research focuses mainly on properties of the reed and how properties of reed affects the overall sound of the instrument. For the description of the signals were used FFT, LPC, Autocorrelation and Cepstral analysis. In conclusion, the thesis offers possible future direction for the experimental research of double reed wind musical instruments.
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Automatic Categorization of Unknown Words Based on Derivational Relations
Faltusová, Marie ; Dytrych, Jaroslav (referee) ; Smrž, Pavel (advisor)
This master thesis deals with the construction of a system for automatic classification of~unknown words based on derivation bonds. For this purpose, the system was designed to~extract derivative links based on electronic dictionaries and to create word-forming models from them. Based on this knowledge, it is then possible to incorporate unclassified words into existing nests formed from the obtained bonds, and their models, or create new ones. The reader will be gradually acquainted with the reasons that lead to the continuous transformation or expansion of the lexicon, the ways in which the words in~the~Czech language are derived and how to obtain information about the changes caused by this derivation process. This system builds on and extends the research of the branch of morphology in~the~project of a morphological analyzer of the Research Group of Knowledge Technologies, working at the Faculty of Information Technology of the Brno University of~Technology.
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