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Creating a database of audio recordings with artificial noise in an anechoic chamber
Hájek, Vojtěch ; Povoda, Lukáš (referee) ; Harár, Pavol (advisor)
This bachelor thesis deals with theory of creating the database of sound records and subsequent creating the database of speech records in the anechoic chamber. Database was created as training dataset for learning process of the artificial neural network, which will be able to separate the speech from background noise. Therefore as the part of the database there are also the recordings of various types of noise that will be used as background noise for the voice recordings. The dataset contains records taken from 18 speakers aged from 16 to 76 years. Half of the speakers were men, half women. Database contains 405 records of speach of average length 46,7 secons and total length 315 minutes. By combining each speech record with each noise record at three levels of signal-to-noise ratio was created 7290 mixed records.
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Hydraulic press 20 tons
Hájek, Vojtěch ; Novotný, Lubomír (referee) ; Omes, Jiří (advisor)
This bachelor thesis is focused on design of the hydraulic press for pressing half–circeled depression on strut of hoods for automotive industry. The content of this thesis is calculation of hydraulic circuit, elastic and deformation calculation of frame, creating drawing documents and description of the manufacturing and following establishment according to plan of the manufacturing hall.
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Restoration of signals with limited instantaneous value for the multichannel audio signal
Hájek, Vojtěch ; Vrba, Kamil (referee) ; Záviška, Pavel (advisor)
This master’s thesis deals with the restoration of clipped multichannel audio signals based on sparse representations. First, a general theory of clipping and theory of sparse representations of audio signals is described. A short overview of existing restoration methods is part of this thesis as well. Subsequently, two declipping algorithms are introduced and are also implemented in the Matlab environment as a part of the thesis. The first one, SPADE, is considered a state- of-the-art method for mono audio signals declipping and the second one, CASCADE, which is derived from SPADE, is designed for the restoration of multichannel signals. In the last part of the thesis, both algorithms are tested and the results are compared using the objective measures SDR and PEAQ, and also using the subjective listening test MUSHRA.
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Performance Analysis of C# Programs
Hájek, Vojtěch ; Rogalewicz, Adam (referee) ; Pavela, Jiří (advisor)
The goal of this thesis is to extend the Performance Version System – Perun by implementing a module for profiling programs written in C# language. This extension implements a tracing profiler with the use of .NET runtime profiling aplication interface. Profiler can collect metrics about trace functions and memory consumption. Measured profiles can then be interpreted into graphs like a scatter plot or a treemap.
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Restoration of signals with limited instantaneous value for the multichannel audio signal
Hájek, Vojtěch ; Vrba, Kamil (referee) ; Záviška, Pavel (advisor)
This master’s thesis deals with the restoration of clipped multichannel audio signals based on sparse representations. First, a general theory of clipping and theory of sparse representations of audio signals is described. A short overview of existing restoration methods is part of this thesis as well. Subsequently, two declipping algorithms are introduced and are also implemented in the Matlab environment as a part of the thesis. The first one, SPADE, is considered a state- of-the-art method for mono audio signals declipping and the second one, CASCADE, which is derived from SPADE, is designed for the restoration of multichannel signals. In the last part of the thesis, both algorithms are tested and the results are compared using the objective measures SDR and PEAQ, and also using the subjective listening test MUSHRA.
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Hydraulic press 20 tons
Hájek, Vojtěch ; Novotný, Lubomír (referee) ; Omes, Jiří (advisor)
This bachelor thesis is focused on design of the hydraulic press for pressing half–circeled depression on strut of hoods for automotive industry. The content of this thesis is calculation of hydraulic circuit, elastic and deformation calculation of frame, creating drawing documents and description of the manufacturing and following establishment according to plan of the manufacturing hall.
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History of sport aviation in Liberec region up to 1970
Hájek, Vojtěch ; Hnilica, Jiří (advisor) ; Parkan, František (referee)
This thesis entitled "The History of Sport Aviation in the Liberec Region until 1970" deals with the development of sports aviation in the area of contemporary Liberec region. The thesis focuses on period that ranges from the end of the Second World War until the beginning of normalization period. The thesis includes five major chapters, in which current knowledge about the discussed topic is summarized from the technical and historical point of view.
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Creating a database of audio recordings with artificial noise in an anechoic chamber
Hájek, Vojtěch ; Povoda, Lukáš (referee) ; Harár, Pavol (advisor)
This bachelor thesis deals with theory of creating the database of sound records and subsequent creating the database of speech records in the anechoic chamber. Database was created as training dataset for learning process of the artificial neural network, which will be able to separate the speech from background noise. Therefore as the part of the database there are also the recordings of various types of noise that will be used as background noise for the voice recordings. The dataset contains records taken from 18 speakers aged from 16 to 76 years. Half of the speakers were men, half women. Database contains 405 records of speach of average length 46,7 secons and total length 315 minutes. By combining each speech record with each noise record at three levels of signal-to-noise ratio was created 7290 mixed records.
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Flood control measures, mobile flood barrier, their advantages and disadvantages and use on the territory of Roudnice nad Labem
Hájek, Vojtěch ; Roub, Radek (advisor) ; Bureš, Luděk (referee)
The aim of this work is to describe the characteristics of floods, especially the causes and consequences of flood in 2002. Describe the ways and means of flood protection. Characterize the various flood protection measures that are commonly used. Especially focus on mobile flood protection measures. Proper building of sandbags dams and the possibility of using these dams. Building dams and possible use of inflatable tubes of Tiger Dam System. Characteristics and building alloy barrier walls. Finally, to describe the flood control measures implemented in the territory of Roudnice nad Labem.
The main contribution of this thesis is to assess the individual capabilities of mobile flood protection measures. Assess their strengths and weaknesses and suitability for use in different situations.
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