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Database of acoustic records
Terz, Marek ; Schimmel, Jiří (referee) ; Sysel, Petr (advisor)
The databsae of accoustical recordings is a web-based application, which is accessible with an usual web browser. There were used technologies, that are ussually used in web applications. This ensures, that the application is open for using by wide range of users. The application enables uploading WAWE files to the server and allows the user to add various description of the recordings. The application allows also comparing the quality of recordings, which were processed with some method for highlighting the accoustical signal from noise. This function is established by listening tests, which are open for every user, who wants to join the tests.
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Psychoacoustic model of human hearing
Lepa, Ondřej ; Smékal, Zdeněk (referee) ; Sysel, Petr (advisor)
This thesis deals with human auditory system and psychoacoustics. Deals with psychoacoustic model of standard MPEG following the norm ISO/IEC 13818-3, Information technology - Generic coding of moving pictures and associated audio information Part 3: Audio. Closer look is given to determination of PAM, to methods of masking and what potential of masking it has. Next the simple computation of psychoacoustic values is~done in Matlab environment.
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Audio processing in BeagleBone AI
Bateško, Tomáš ; Krajsa, Ondřej (referee) ; Sysel, Petr (advisor)
This masters thesis deals with Texas Instruments AM5729 processor that combines ARM and DSP core used on BeagleBone AI kit. It describes instalation and configuration of development toolchain and explains concept of heterogenous processor communication. Then uses this knowledge and tools in order to implement application where ARM core running Linux uses DSP core as coprocessor for realtime audio processing.
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Perlin noise functions for generation of textures
Jakubíková, Radka ; Sysel, Petr (referee) ; Rajmic, Pavel (advisor)
This work deals with Perlin noise function in theoretical and practical way. Procedural textures can be generated by Perlin noise function. Perlin´s algorithm has many advantages, for example natural appearance, smaller demands on memory capacity and possibility of simple application on cubic objects. It is for these reasons that this technique is widely used nowadays in many varieties and improvements. We can meet these kind of textures mainly in computer games or animated movies. It is possible to create procedural textures by Perlin noise function so that they look like marble, wood or grass. Examples of these textures are generated by a program which is in the practical part of this work. The program was designed for simple presentation of procedural textures made by Perlin noise. Program can be operated via user interface, where the user can change some parameters which affect the look of the texture. The program can be used for presentation of Perlin noise to students.
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Robust detection of keywords in speech signal
Vrba, Václav ; Sysel, Petr (referee) ; Atassi, Hicham (advisor)
The master thesis is divided into two parts theoretical and practical. The theoretical part is focused on methods of analysis and detection of speech signals. In the practical part the system for isolated word recognition was created in Matlab. The system is speaker independent separately for men and women. Also two speech databases were created for further use in the aircraft cockpit. Tests and evaluations were performed even with added noise.
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Localization acoustic near-field sources
Šuránek, David ; Sysel, Petr (referee) ; Míča, Ivan (advisor)
This thesis is focused on acoustic source localization in near field situation. First part of this thesis is dedicated to examining the fundamental issues of acoustic source localization. After that are some of acoustic source localization methods described. Next part is focused on implementation, verification of functionality, comparing of the successfulness and results of the localization. In conclusion are summarized the outcomes of the thesis.
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Speech segmentation
Kašpar, Ladislav ; Galáž, Zoltán (referee) ; Sysel, Petr (advisor)
My diploma thesis is devoted to the problem of segmentation of speech. It includes the basic theory on this topic. The theory focuses on the calculation of parameters for seg- mentation of speech that are used in the practical part. An application for segmentation of speech has been written in Matlab. It uses techniques as segmentation of the signal, energy of the signal and zero crossing function. These parameters are used as input for the algorithm k–means.
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Speech denoising based on wavelet transform and voice recognition in segments
Chrápek, Tomáš ; Sysel, Petr (referee) ; Rajmic, Pavel (advisor)
The wavelet transform is a modern signal processing tool. The wavelet transform earned itself a great success mainly for its unique properties, such as the capability of recognizing very fast changes in processed signal. The theoretical part of this work is introduction to wavelet theory, more specifically wavelet types, a wavelet transform and its application in systems dealing with signal denoising. A main problem connected to speech signals denoising was introduced. The problem is degradation of the speech signal when denoising unvoiced parts. It is because of the fact that unvoiced parts and noise itself have very similar characteristics. The solution would be to apply different attitude to voiced and unvoiced segments of the speech. The main goal of this diploma thesis was to create an application implementing the speech signal denoising using the wavelet transform. The special attention should have been paid to applying different attitude to voiced and unvoiced segments of the speech. The demanded application is programmed as a grafical user interface (GUI) in MATLAB environment. The algorithm implemented in this form allows users to test introduced procedures with a great comfort. This work presents achieved results and discusses them considering general requirements posed on an application of given type. The most important conlusion of this Diploma Thesis is the fact that some kind of trade-off between sufficient signal denoising and keeping the speech understandable has to be made.
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Detection of the voice fundamental frequency
Chloupek, Jiří ; Mekyska, Jiří (referee) ; Sysel, Petr (advisor)
This bachelor thesis deals with the detection of the pitch man. The frequency of the basic tone is one of the basic parameters of speech signal in the frequency domain. In this thesis we describe several methods for pitch detection and practical application of correlation method and cepstral analysis.
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Identification of Ink Cartridges of Industrial Printer
Galád, Dominik ; Sysel, Petr (referee) ; Číka, Petr (advisor)
This thesis deals with the identification of ink cartridges by the industrial printer TSjet. There are described the basic methods of identification of ink cartridges that are commonly used today. There is also described 1-Wire® bus and USART interface. In the second part the thesis deals with suitable security algorithms for data security stored on the identification chip. The practical part describes the design of the system for identification of the ink cartridge. The conclusion of the thesis summarizes the results of design testing in practice and the safety evaluation of the whole system.
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