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Stress recognition from speech signal
Staněk, Miroslav ; Přibil, Jiří (referee) ; Tučková,, Jana (referee) ; Sigmund, Milan (advisor)
Předložená disertační práce se zabývá vývojem algoritmů pro detekci stresu z řečového signálu. Inovativnost této práce se vyznačuje dvěma typy analýzy řečového signálu, a to za použití samohláskových polygonů a analýzy hlasivkových pulsů. Obě tyto základní analýzy mohou sloužit k detekci stresu v řečovém signálu, což bylo dokázáno sérií provedených experimentů. Nejlepších výsledků bylo dosaženo pomocí tzv. Closing-To-Opening phase ratio příznaku v Top-To-Bottom kritériu v kombinaci s vhodným klasifikátorem. Detekce stresu založená na této analýze může být definována jako jazykově i fonémově nezávislá, což bylo rovněž dokázáno získanými výsledky, které dosahují v některých případech až 95% úspěšnosti. Všechny experimenty byly provedeny na vytvořené české databázi obsahující reálný stres, a některé experimenty byly také provedeny pro anglickou stresovou databázi SUSAS.
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Analog Guitar Multieffect
Zapletal, Ondřej ; Petržela, Jiří (referee) ; Staněk, Miroslav (advisor)
Presented thesis is focused on guitar effects used for sound modification produced by an electric guitar. The main aim of this thesis is an introduction into guitar effects topic and the design of selected types chosen as follows: overdrive, noise gate and delay. Final multieffect is created by these mentioned components. Another part of presented thesis is the design of source feeding the whole final multieffect. Furthermore, the design of chosen components is presented in this thesis as well as the including of control simulations and PCBs.
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Speech signal processing in time domain
Marko, Ján ; Staněk, Miroslav (referee) ; Sigmund, Milan (advisor)
The bachelor´s project deals with the processing of speech signals. The work includes a search of available publications on the issue of determining the voiced segments of speech and fundamental frequency. Attention is devoted to methods for speech recognition features in the time domain. Comparing theoretical and practical results on the real speech signals evaluates the use of methods, highlighting their advantages and disadvantages.
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Music based electronic light effect
Grygar, Josef ; Staněk, Miroslav (referee) ; Šotner, Roman (advisor)
This work is focused on music baset light effect, it´s principles and possibilities of realization. Music based light effect can affect our perception of reproduced music. This work include design and realization of spectral analyzer, anti-aliasing filter and output power parts. Spectral analyzer uses Fast Fourier transform (FFT) to count resulting spectrum, which is displayed on LED bargrafs. In the theoretical part the priciples of analog to digital conversion are closer described. According to this information, selection of suitable microcontroller is discused.
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Signal analysis of spoken consonants
Jurák, Petr ; Staněk, Miroslav (referee) ; Sigmund, Milan (advisor)
The aim of this work is at first to explore the characteristics and problems of the Czech consonants and the speech recognition. Then create a study of the methods used in automatic consonants and then create an algorithm to detect groups of the Czech consonants. The consonants are mainly involved in speech intelligibility. This work mainly deals with segmental description of the speech. Prosodic features are not yet considered.
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Phonetic processing of speech using Praat
Kráčala, Martin ; Staněk, Miroslav (referee) ; Sigmund, Milan (advisor)
The goal of this bachelor thesis is to create a Czech manual for beginners with software Praat. Praat is a software package designed for speech processing. It can be used for speech analysis and synthesis. In this work is described Praat user interface, operations with files in the program, sound recording, editing and analysis of these sounds. Manual is supplemented with examples of solved phonetic problems. The second goal of this thesis is to create a script to extract vowels and some consonants from voice records. The thesis contains description of chosen principles of recognition of vowels based on formants and intensity contour and the principle of recognition of consonants based on the ratios of energy in predetermined frequency bands. The success rate of the script is thoroughly examined and various optimization methods are discussed.
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Analog Guitar Multieffect Using Tube for Signal Distortion
Kufa, Michal ; Kincl,, Zdeněk (referee) ; Staněk, Miroslav (advisor)
Presented thesis is oriented on the short survey of guitar effects functionality and the design of chosen guitar effects set embedded into one device. The first effect is related to input signal distortion using a vacuum tube, in this case the couple of double-diode tubes. Next effect is noise gate filtering parasitic artefacts included in input signal lower than set threshold level. The last realized guitar effect is chorus. Each individual effect can be controlled by footswitch. The first two sections are focused on the theory of guitar signal processing, the third section solves the whole design of chosen device, the realization and the proof of designed device functionality are described in further sections.
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Tube Microphone
Škoda, Adam ; Šotner, Roman (referee) ; Staněk, Miroslav (advisor)
The presented thesis deals with a tube microphone using a condenser microphone capsule for sound capturing. Moreover, two essential aspects of a tube microphone – the basis of its operation and its design – are also discussed in this thesis. In the designed microphone, there is a vacuum tube known as ECC81. This vacuum tube is used as an amplifying element of an input sound signal. This paper also includes the choice of the most suitable microphone circuit, its modification and the design of a voltage source used for feeding and heating the vacuum tube. Some appropriate simulations were applied to find out the functionality of all designed parts of the microphone system. Following step was the practical realization of all microphone parts as well as the activation and the complete parameters and characteristics measurements of realized microphone system. After the provided measurements, the microphone was compared to equivalent commercial products. Evidently, the realized microphone is qualitatively similar to other commercial products. Presented thesis also contains the list of components and PCBs.
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