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Psychoacoustical Measurement of Binaural Hearing Characteristics
Novotný, Ota ; Trzos, Michal (referee) ; Schimmel, Jiří (advisor)
This diploma thesis deals with a binaural hearing issues (it means hearing by both of ears), a human hearing ability to locate position of a sound source at three-dimensional space and parameters that affect this ability. In the second part, it focuses on psychoacoustic experiment, its main features and errors that can occur and which affect a results credibility. Method of pair comparisons is described more closely here. The last part of this thesis describes a technical solution of experiment in Java environment. The application should have a graphical interface and should be able to register a new user and perform a psychoacoustical experiment. The process of experiment is following. The aplication selects a random position of defined virtual sound source on the defined range and it plays this sound into headphones on button click. The users task is to set the application controls, representing a virtual sound source position, that way, where the user hear the sound come from. On another button click the application plays the same sound, but this sound comes from application controls set position (set by user). User compares this pair of sounds and modifies the position of second sound source until these two positions are same. The application stores these results for later processing on another button click. Principles of generating testing sound sources (sine wave, narrowband noise and sound file with wav extension) and their 3D positioning by measured head model impulse responses correlation are described thereinafter. An ability of human hearing system to locate a virtual sound source in dependence on sound parameters is discussed in conclusion.
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Návrh akustického interiérového prvku
Kováčová, Jana
The diploma thesis is devoted to the design of an acoustic interior element for a public space interior, but can also be used in private. The work describes the history of screens and screens, typology of furnishing elements, and the issue of interior acoustics plus concepts related to this topic. The practical part is devoted to research and design and screen design. It contains a description of the process of sketching, modeling in the respektive programs as well as visualization of both the model itself and its location in space. Verification of the stability of the digital model, using the finite element method elements. There is also an evaluation of the acoustic parameters in the real selected office space.
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Home for seniors
Koláříková, Eliška ; Pilný, Ondřej (referee) ; Berková, Petra (advisor)
The aim of the master´s thesis is to design a Residential care home as smart building. It is situated in the centre of Křenovice near Brno. The master´s thesis is divided into three parts, first part presents design documentation, second part is focused on building services and the final part presents noise control in building. Residential care house is designed as two-storey building without basement with flat roof. On the first floor there is utility area for senior house and healthcare facility and on the second floor there are flats for seniors. Residential care house is built on footing. Load-bearing and non-load-bearing walls are designed from hollow bricks type THERM. External walls are insulated with mineral wool. The roofing of residential care house is made up of extensive green roof. The building services of the building includes two ground-water heat pumps with boreholes for heating and cooling, photovoltaic panels, HVAC, hot water cylinder and rainwater storage tank. The final part is focused on noise control in building. It is about acoustic in construction. Noise study is also included.
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The analysis of acoustic properties of innovative wood-based materials
Svojanovský, Jan ; Nop, Patrik (referee) ; Jirásek, Ondřej (advisor)
The content of this work is research of innovative wood-based materials in the acous-tic perspective. Basically, the goal is to determine the influence of the internal structure of the wood-based material on variables, which are sound speed, acoustic resistance, or acous-tic constant. In total were measured 15 samples, each one was made in a different way. Each sam-ple was weighted, and the length of its sides was measured. By using the ultra sonic timer, it was measured the time of the sound impulses, which go through the samples in all of their axes for the purpose of observation the influence the fibers on speed of sound in the materi-al. The next thing to do was to determine another magnitude, which describe acoustic of the material. All measurements were taken in room conditions (room humidity). Six of the sam-ples, which were randomly selected from those 15 samples, were measured once again after two weeks. In those two weeks were all the samples saved in air-conditioned place in which was the room humidity distinct lower. In the end all the samples were compared with each other and they were also com-pared with materials which are commonly used in production of musical instruments or acoustic components. Possible use in the music industry was assigned to each sample.
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Flat Plates Noise
Zlámal, Josef ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The master thesis summaries the findings results of a study focused on the spread of noise vibrating flat plates. Part of this thesis is measurements of flat plate noise in the anechoic chamber and finally their processing and evaluation. The next part of the thesis is focused on FEM acoustic simulation and comparing results with measurements.
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Metodická příručka pro práci s audio analyzátorem Audio Precision
DOLEJŠÍ, Marek
This thesis is focused on the use of the Audio Precision audio analyzer, model APx515. The goal of this thesis is to educate the operator of the measuring instrument about its functions and features. Supporting chapters cover deeper understanding in the field of audio. This thesis was written on the request of the Department of Physics and Biophysics, the University of South Bohemia and shall be used as a methodological guide for working with this audio analyzer. The first part of this document will discuss the theory of audio analysis, and in the second section I will cover the practical usage of the instrument. In the theoretical part, there are various kinds of measurements and audio tests described. Special attention is devoted to commonly used units in audio engineering including their explanation. The next chapter, Acoustic, describes basic terms about sound from a physical and psychoacoustic point of view and also focuses on human hearing. The Chapter about Hi-Fi then describes issues relating to quality music reproduction. The practical part focuses on the use of the analyzer. Several kinds of connections for different tests are described. They are followed by measurement results of a sample of devices of different kinds: preamplifiers, power amplifiers, integrated amplifiers and DACs in consumer electronics.
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Computer assisted physics education in basic schools
SALCER, David
The goal of this master's theses is to create interactive educational package for teaching physics at primary schools. Next part of the thesis will be creating new interactive materials for teaching "Acoustic" and then testing the materials in their compatibility/usability part and test it in real teaching.
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Protective Guards of Machine Tool
Zlámal, Josef ; Učeň, Oldřich (referee) ; Novotný, Lubomír (advisor)
The master thesis deals with the problematics of machine guard. The first part of the thesis is focused on the analysis of machine guards, legislative safety requirements and noise issues. The second part of the thesis describes design and construction of the machine guard in case of the vertical turning centre, TOSHULIN - POWERTURN 2000, including the calculation of noise reduction.
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