National Repository of Grey Literature 86 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Analysis of Expressive Music Performance using Digital Signal Processing Methods
Ištvánek, Matěj ; Mekyska, Jiří (referee) ; Smékal, Zdeněk (advisor)
This diploma thesis deals with methods of the onset and tempo detection in audio signals using specific techniques of digital processing. It analyzes and describes the issue from both the musical and the technical side. First, several implementations using different programming environments are tested. The system with the highest detection accuracy and adjustable parameters is selected, which is then used to test functionality on the reference database. Then, an extension of the algorithm based on the Teager-Kaiser energy operator in the preprocessing stage is created. The difference in accuracy of both systems is compared – the operator has on average increased the accuracy of detection of a global tempo and inter-beat intervals. Finally, a second dataset containing 33 different interpretations of the first movement of Bedřich Smetana’s composition, String Quartet No. 1 in E minor "From My Life". The results show that the average tempo of the entire first movement of the song slightly decreases depending on the later year of the recording.
Practical examples of signal processing
Hanzálek, Pavel ; Smékal, Zdeněk (referee) ; Mekyska, Jiří (advisor)
The thesis focuses on the issue of signal processing. Using practical examples, it tries to show the use of individual signal processing operations from a practical point of view. For each of the selected signal processing operations, an application is created in MATLAB, including a graphical interface for easier operation. The division of the thesis is such that each chapter is first analyzed from a theoretical point of view, then it is shown using a practical demonstration of what the operation is used in practice. Individual applications are described here, mainly in terms of how they are handled and their possible results. The results of the practical part are presented in the attachment of the thesis.
Research of dynamics features comparing audio records
Zemánková, Šárka ; Smékal, Zdeněk (referee) ; Kiska, Tomáš (advisor)
This work deals with the analysis of parameters related to the dynamics of sound recordings. It contains a brief description of the history of sound processing in analogue and digital form and the process of audio signal processing nowadays. The following chapter includes selection of the most suitable parameters for describing an audio recording, especially those describing the dynamics. This work further characterizes the methods used in similar researches in the world. There is also a system designed to calculate 43 dynamic parameters and the possibilities of their analysis are outlined as well. 35 different interpretations of one musical work were compared. Finally, the calculated parameters were drawn into scatter plots and evaluated using visual cluster analysis.
Spectrum analysis of the violin
Hanzálek, Pavel ; Smékal, Zdeněk (referee) ; Jirásek, Ondřej (advisor)
This work focuses on the problems of sound spectrum analysis and directional characteristics of the violin. The beginning of the work deals with the development of the violin, generally about timbre and directional characteristics. The theoretical part also deals with different types of sound spectra and LPC analysis on general. The practical part deals with practical tasks of work such as a description of the application created in MATLAB for examination of the time spectrum of tones, FFT spectra, formants by LPC analysis and display of directional characteristics. It also deals with the describing the methods, the process of sensing and measuring two different violins with different types of strings and age of corpus.
Parallel implementation of Goertzel algorithm
Skulínek, Zdeněk ; Smékal, Zdeněk (referee) ; Sysel, Petr (advisor)
Technical problems make impossible steadily increase processor's clock frequency. Their power are currently growing due to increasing number of cores. It brings need for new approaches in programming such parallel systems. This thesis shows how to use paralelism in digital signal processing. As an example, it will be presented here implementation of the Geortzel's algorithm using the processing power of the graphics chip.
Analysis of Expressive Music Performance using Digital Signal Processing Methods
Fančal, Petr ; Mekyska, Jiří (referee) ; Smékal, Zdeněk (advisor)
The aim of this master's thesis is the analysis of musical compositions from the standpoint of time resources of music. The introduction briefly describes the basic musicological terms and variables that are in direct relationship to the time resources in expressive music performance. The following part of the work is devoted to the known methods of digital signal processing, suitable for music information retrieval from audio recordings. In the practical part these methods are demonstrated on three recordings in MATLAB environment and the results were compared in terms of used agogics.
Correlation analysis of Parkinson's disease in the acoustic field
Vošček, Jakub ; Mekyska, Jiří (referee) ; Smékal, Zdeněk (advisor)
The topic of this bachelor thesis is the correlation analysis of Parkinson’s disease in the acoustic field. The first part is about the Parkinson disease and its symptoms. It looks closer on problems with speech production, which is called hypokinetic disarthria, and describes the causes of the problems as well as the kind of treatment that is used. The next part involves a study of the pre–processing of signal, i.e. removing the direct component, a preemphasis and a segmentation to smaller frames. Afterwards, individual parameters are calculated in the next step. It is also necessary to calculate simple statistics, for example a median, a standard deviation, etc. after the calculation of some parameters. The calculation of Pearson’s and Spearman’s correlation coefficients is included. Moreover, a block diagram for the data processing is suggested, which involves a description of the functions of the individual blocks. The program is explained in the practical part, which also features parts of the tables with parameters' values and the calculated coefficients. As the conclusion of the work, there are graphs which display correlations of the parameters and the paraclinical data.
Speech Enhancement using Cancelling of Dissonant Components
Studený, Radim ; Mekyska, Jiří (referee) ; Smékal, Zdeněk (advisor)
This work is supposed to remove interferences from speech signal and so increase its clarity, quality of degraded signal and signal-to-noise ratio. The most common sources of interference could be street noise, wind coming on a microfon, speech on the background or music.The metod described in this work remove frequence bands of a signal, which in relation to the fundamental frequency of a speech are disonant. Be specific, to reference tone C there are F#, B a C# tones.
Speech signal processing via web interface
Markovič, Michal ; Smékal, Zdeněk (referee) ; Mekyska, Jiří (advisor)
This work is resolving the possibility of processing a speech signal by using the web interface. A record of the speech signal is made and then saved and stored in servers. Then it’s possible to analyse and process the record with the help of a web application written in the C++ programming language. The results are shown in website.

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