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Noise Analysis of Audio Signals
Kabarová, Anísa ; Mach, Václav (referee) ; Schimmel, Jiří (advisor)
The theoretical part of this work deals with the basics of acoustics, noise measurement and statistical noise level analysis. The application part focuses on the implementation of the frequency and time weighting according to the technical standard IEC 61672 and the statistical noise level analysis in MATLAB programming environment. Finally the reliability of the application is tested on real data and the results are compared to those measured by a digital Sound Level Meter.
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Electronic Booking System for Laboratories and Laboratory Equipment
Povoda, Lukáš ; Mach, Václav (referee) ; Schimmel, Jiří (advisor)
The main aim of this paper is to create the database structure and the web interface of the reservation system. This system is for the reservation of the laboratories and of the measuring equipement (for hire). System was created by the most widely language intended for creating Web application - language PHP, and database system MySQL, specifficaly base on the storage system InnoDB formed for relation database and the transaction. This paper descbires the princip of the work of modern patterns like Model-View-Presenter or Dependency injection and their both practical use. The code of the web application has been based on PHP framework Nette, on PHP library dibi created for database MySQL, on library mPDF created for generation of the PDF files from HTML code. System has been created according to convention of framework Nette and already mentioned design pattern, so it means that all changes such as spreading, changes of implemented funcions, changes of design of web interface, work with the datas or implemenation of the new interface and of new funcions will be simpler and take less time then for example the use of the system without convention and pattern.
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Multiplatform audio player
Malár, Ladislav ; Mach, Václav (referee) ; Sysel, Petr (advisor)
This master thesis deals with creating of the cross-platform audio player with the possibility of its use in the speech-language pathology clinic. The theoretical part is focused on the comparison of two multi-platform libraries, of which was one chosen for creating of the player. Subsequently on functionality SQLite database, which was also used as part of the final application. The basis of the practical part is the creation of the cross-platform audio player which is extended about database of patients and also extended about speech signal analysis with the help of VST plugin.
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Loudness Index Measuring
Hloušek, Pavel ; Mach, Václav (referee) ; Kurc, David (advisor)
This thesis deals with noise measuring. There are described methods of measurement and evaluation of noise, focusing on Steven’s loudness calculation method. Basic concepts of acoustics are provided in the first part. There are also mentions measurement of noise using microphones and sound level meter. The second part is focused on the practical solution of thesis. In which it is made measurement of noise using sound level meter NTi Acoustilizer and implementation of the graphical user interface for calculation of the Steven’s loudness index in Matlab.
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Making up missing audio signal sections
Pospíšil, Jiří ; Rášo, Ondřej (referee) ; Mach, Václav (advisor)
The goal of this bachelor’s thesis is to get introduced with methods for reconstruction of missing samples in audio signal using periodicity-based interpolation and AR model based interpolation. Further it’s introducing us with Audio Inpainting method based on sparse representation. In practical part there are programmed three algorithms based on these interpolation methods and described an algorithm which is used in Audio Inpainting. These algorithms are compared with objective methods, SNR measurements depending on gap length and value of input parameter.
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Subjective evaluation of background noise in audio systems
Falešník, Vlastimil ; Mach, Václav (referee) ; Rášo, Ondřej (advisor)
In this bachelor thesis, the effect of additive background noise on audio recordings was researched. This kind of noise often occurs when these recordings are being restored. The most frequent effort is to suppress these unwanted noises. While suppressing the noises, the most problematic part is that it always depends on subjective evaluation of the listener. Practical impacts of these noises were researched throughout two listening tests. Afterwards, it was necessary to choose proper (ordinal) evaluating scale. The listening tests established the subjective assessment of jammed additive noise degree. Finally, the effect of selected parameters on subjective perceived quality was determined.
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Multiplatform player of audio signals
Šenovský, Jiří ; Mach, Václav (referee) ; Sysel, Petr (advisor)
This thesis is about problematic of multiplatform libraries for graphic interfaces. Two most widely used libraries Qt and GTK+ were chosen for further comparation. Short program will be programmed with both of these libraries. Difficulty of using Qt and GTK+ will be explored using this program. On this basis one library will be chosen and multiplatform sound player will be created using this library. It will be extended by record function and showing of timeline and spectrogram of a record.
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Application for Measurement of Musical Instruments Directional Characteristics
Ustohalová, Iveta ; Orlovský, Kristián (referee) ; Mach, Václav (advisor)
This bachelor thesis is focused on the directional charateristics of acoustics music instruments measurements. Compilalation of measuring apparatus including microphone array and the individual steps of measurement and post-processing of audio recordings in *.wav format using program created in MATLAB and ment for this purpose is described. The output are graphs showing the directional charakteristics of selected instruments - violin, clarinet, guitar and accordion in selected one-third octave bands. The measurement results are interpreted and if available, compared with results given in literature.
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Porovnání utužení půdy na zemědělském pozemku v závislosti na použité technologii jejího zpracování
MACH, Václav
The diploma thesis deals with the issue of soil degradation by compaction and with the influence of different method of cultivation on pedocompaction. It describes the problem of soil compaction, origin of this degradation, its impacts and whether it is possible to prevent the compaction or eliminate it afterwards. It also deals with description of measuring device which is able to find out the figures of penetrometric resistance of soil and its moistness. The thesis also closely describes individual work operations that have been done on the land. The tillage is analysed in detail because it is the system of cultivation that can highly influence the compaction. The most commonly used systems of soil cultivation are mentioned with their advantages and disadvantages. The experiment in the diploma thesis deals with the influence of soil compaction using different technology in its process. The field experiment took place on a trial field that was divided into two parts in terms of tillage. The first part was used for ploughing within three years and on the other ploughing was replaced by loosening. After collecting necessary data their evaluation took place. The figures of penetrometric resistance and soil moisture are summarized in tables and plotted in graphs for better interpretation.
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