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Methods for instantaneous speed estimation in ultrasonic object detection
Šilar, Adam ; Pikula, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The main goal of this master thesis is to explore suitable methods for estimating the instantaneous velocity of a moving object. The estimation of instantaneous velocity is based on the knowledge of the Doppler effect, which causes a shift in the frequency of ultrasound to another frequency depending on the velocity. Using the knowledge of the Doppler effect, a procedure is described for designing and programming a generator of simulated ultrasound data in the LabVIEW environment. The thesis theoretically describes methods for estimating instantaneous velocity, and selected methods are applied to test data to obtain information about the object's instantaneous velocity. The selected methods are tested for various parameters and compared with each other. The methods were subsequently practically tested on real measured data and compared with their simulated versions.
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Wearable ECG Measurement System
Trenz, Tomáš ; Krajsa, Ondřej (referee) ; Červenka, Vladimír (advisor)
This bachelor thesis deals with the measurement of ECG data. The main theme is digital filtering desired signals from noise and artifacts, which arises mainly to interfere with the power grid, moving the measured entity or electromagnetic interference. A secondary objective is the issue of compression for data transmission.
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Using Hilbert Huang transformation for analysis of non-stationary signals from physical experiments
Tuleja, Peter ; Balík, Miroslav (referee) ; Rášo, Ondřej (advisor)
This paper discusses the possible use of Hilbert-Huang transform to analyze the data obtained from physical experiments. Specifically for the analysis of acoustic emission in the form of acoustic shock. The introductory section explains the concept of acoustic emission and its detection process. Subsequently are discussed methods for signal analysis in time-frequency domain. Specifically, short-term Fourier transform, Wavelet transform, Hilbert transform and Hilbert-Huang transform. The final part contains the proposed method for measuring the performance and accuracy of different approaches.
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Wearable ECG Measurement System
Trenz, Tomáš ; Krajsa, Ondřej (referee) ; Červenka, Vladimír (advisor)
This bachelor thesis deals with the measurement of ECG data. The main theme is digital filtering desired signals from noise and artifacts, which arises mainly to interfere with the power grid, moving the measured entity or electromagnetic interference. A secondary objective is the issue of compression for data transmission.
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Using Hilbert Huang transformation for analysis of non-stationary signals from physical experiments
Tuleja, Peter ; Balík, Miroslav (referee) ; Rášo, Ondřej (advisor)
This paper discusses the possible use of Hilbert-Huang transform to analyze the data obtained from physical experiments. Specifically for the analysis of acoustic emission in the form of acoustic shock. The introductory section explains the concept of acoustic emission and its detection process. Subsequently are discussed methods for signal analysis in time-frequency domain. Specifically, short-term Fourier transform, Wavelet transform, Hilbert transform and Hilbert-Huang transform. The final part contains the proposed method for measuring the performance and accuracy of different approaches.
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