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Hlučnost výrobních strojů ve vybraném podniku
VOJTA, Jiří
The diploma thesis deals with noise measurement. The theoretical part contains the knowledge gained by studying literature. I have described acoustics, sound and noise, noise and health and legislative contexts as well as noise reduction methods. The practical part contains information about the company and individual machinery, the results of measurements and their evaluation according to valid legislation. I have suggested appropriate measures to reduce the noise burden on operators.
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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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Spectral analysis of sound in spatial acoustics
Křenek, Jakub ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
This thesis is focused on the basics concepts of room acoustics and used sound level meters. The first part focuses on the spatial acoustics and acoustic quantities used in it. Next part of thesis describe the structure and features of sound level meters. Following chapters are concerned on the PULSE system architecture and data analysis. PULSE platform contributes multi-spectral analyzer type 3560B PULSE, programming environment LabShop and microphones for difuse and free fields. The practical part describes the installation, setup and the measurement of reverberation time in the Labshop environment.
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Spectral analysis of sound in spatial acoustics
Křenek, Jakub ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
This thesis is focused on the basics concepts of room acoustics and used sound level meters. The first part focuses on the spatial acoustics and acoustic quantities used in it. Next part of thesis describe the structure and features of sound level meters. Following chapters are concerned on the PULSE system architecture and data analysis. PULSE platform contributes multi-spectral analyzer type 3560B PULSE, programming environment LabShop and microphones for difuse and free fields. The practical part describes the installation, setup and the measurement of reverberation time in the Labshop environment.
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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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Automation of Noise Measurements Using XL2 Sounl Level Meter
Švihálek, Filip ; Číž, Radim (referee) ; Schimmel, Jiří (advisor)
This bachelor´s thesis focuses on noise measurement, characterizes used quantities and uncertainties due to the measument of these quantities. The goal is to develop application, which will automate measurement with sound level meter XL2. Automation will use text output of the XL2 and modul for Remote Measurement. Application is developed in development environment Visual Basic for Applications.
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Sound level meter for embedded systems
Stejskal, Tomáš ; Schimmel, Jiří (referee) ; Botta, Miroslav (advisor)
The aim of this work is the design and implementation of a sound level meter for emdedded systems. It is designed sound level meter sensor. This sensor includes a microphone, microphone preamplifier and ADC. This sensor is connected to a development kit STM32F4 Discovery, where sound is processed. It is processed filtration, time weighting, calculation of sound leve and loudness weighting. The sound level is then sent via the serial communication USART. This thesis includes a theoretical analysis of noise and its human perceptions. It also describes the development platform used.
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Brüel a Kjaer sound level meters evaluation and their practical application
NOVOTNÝ, Michal
The aim of this diploma paper was to characterize sound level meters by Brüel and Kjaer Company and especially to offer the description of the Type 2250 and characterization of its functions. One Type 2250 Sound Level Meter was available to the author when working on the diploma paper. This measuring instrument was used for obtaining data from measuring in several different situations. These measuring results were thereafter presented.
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Noise Pollution of the Urban Area Caused by a Dairy Farm
BEHENSKÝ, Luboš
The aim of the work is to determine noise pollution of the urban area caused by a dairy farm in Tajanov. Three receiver locations that were chosen are located on the urban area border at which are crucial for the spreading of noise into this observed area. Nine time intervals were recorded in each receiver location. The length of each time interval was one hour. Equivalent continuous sound pressure levels were quantified for each day and night reference time interval. The levels were compared with the local noise law limits and the share of the dairy farm on the total amount of noise that has been identified.
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