|
|
Automation of measurement of directional characteristics of sound sources
Nimmerrichter, Benjamin ; Liska, Matej (referee) ; Schimmel, Jiří (advisor)
This bachelors thesis deals with the topic of automating the measuring of directional sound radiation characteristics of sound sources with the use of one to sixteen, possibly thirty-two microphones connected to an audio device, which supports the ASIO driver technology, which is connected to a computer with an installation of the MATLAB software. In the scope of this thesis a program was created, which is capable of measuring the 2D and 3D directional characteristics of sound sources and it can show the frequency spectrum of the signal. This work addresses the problematics of the effective value of discrete signals, calibration of microphones for measuring sound pressure level, the calculation and measuring of the level of acoustic pressure in dB (SPL), the autocorrelation of a discrete signal, plotting of the measurement in a polar or spherical plot and the calculation of the signal to noise ratio. This thesis contains a theoretical introduction to the measurement and to the propagation of sound, then the composition of the program and the measurement and an assessment of the measured results.
|
|
|
RMS Value Measurement Algoritihms
Zedník, Josef ; Štohl, Radek (referee) ; Šedivá, Soňa (advisor)
This master´s thesis focuses on theoretic analysis selected methods for determination effective value of non-coherent sampled voltage signals. In thesis are described algorithms for calculation effective value in time and frequency domain. One of task this thesis was design methods of program for simulation selected methods of measurement non-coherent sampled voltage signals. This program is realized in developmental environment of LabVIEW and his realization is described in this thesis. User has possibility calculate effective value and bias characteristic depend on selected method and selected input signal. Part of this thesis are simulations, which compares selected methods of calculation effective value.
|
|
|
Automation of measurement of directional characteristics of sound sources
Nimmerrichter, Benjamin ; Liska, Matej (referee) ; Schimmel, Jiří (advisor)
This bachelors thesis deals with the topic of automating the measuring of directional sound radiation characteristics of sound sources with the use of one to sixteen, possibly thirty-two microphones connected to an audio device, which supports the ASIO driver technology, which is connected to a computer with an installation of the MATLAB software. In the scope of this thesis a program was created, which is capable of measuring the 2D and 3D directional characteristics of sound sources and it can show the frequency spectrum of the signal. This work addresses the problematics of the effective value of discrete signals, calibration of microphones for measuring sound pressure level, the calculation and measuring of the level of acoustic pressure in dB (SPL), the autocorrelation of a discrete signal, plotting of the measurement in a polar or spherical plot and the calculation of the signal to noise ratio. This thesis contains a theoretical introduction to the measurement and to the propagation of sound, then the composition of the program and the measurement and an assessment of the measured results.
|
|
| |
|
|
RMS Value Measurement Algoritihms
Zedník, Josef ; Štohl, Radek (referee) ; Šedivá, Soňa (advisor)
This master´s thesis focuses on theoretic analysis selected methods for determination effective value of non-coherent sampled voltage signals. In thesis are described algorithms for calculation effective value in time and frequency domain. One of task this thesis was design methods of program for simulation selected methods of measurement non-coherent sampled voltage signals. This program is realized in developmental environment of LabVIEW and his realization is described in this thesis. User has possibility calculate effective value and bias characteristic depend on selected method and selected input signal. Part of this thesis are simulations, which compares selected methods of calculation effective value.
|
|
| |
|
| |
guest ::
