National Repository of Grey Literature 7 records found  Search took 0.00 seconds. 
The Noise Database
Végh, Zoltán ; Špiřík, Jan (referee) ; Hudec, Antonín (advisor)
n semestral thesis proposed a system for recording acoustic signals, which in this case presented a concrete noise, and I have been tested software has to improve the quality of recorded samples. This system consists of several blocks, such as signal pre-processing blocks, to formulate requirements for the improvement of recordings, such as sampling frequency and bit resolution. The first step is therefore to establish settings for the recording device. Then followed the reprocessing of signals such as filtration and separation.
Database of recordings for detection of voice activity
Pelikán, Pavel ; Hudec, Antonín (referee) ; Míča, Ivan (advisor)
This thesis deals with voice activity detection (VAD) and requirements for creating a speech database. One of the existing tools for marking recordings was chosen. On the basis of the gained knowledge, database of isolated words, sentences, text and spontaneous speech was created. The practical part consists of a detailed description of database and mark creation. Furthermore, the thesis deals with the conversion of marks into Matlab. There are also some auxiliary scripts for operations with marks. Prepared and a database was created in an anechoic chamber and includes recordings from 16 speakers.
Speech Enhancement Methods
Kukučka, Peter ; Mekyska, Jiří (referee) ; Hudec, Antonín (advisor)
Aim of this work is summarize some single-channel methods of speech enhancement. These methods are explained in this work: Basic Spectral Subtraction Method, Modified Spectral Subtraction, Multi-band Spectral subtraction, spectral subtraction MMSE and Wiener filtering. All methods are implemented. Preprocessing, voice activity detector and speech scores are explained in this paper, too.
Digital filter for acoustic band, implemented by microcontroller
Hudec, Antonín ; Sysel, Petr (referee) ; Kubánek, David (advisor)
Microcontrollers of the ATmega family are not very suitable for real-time digital signal processing. Although they can reach 20 MIPS with maximum clocking of 20 MHz (most of the instructions are within one clock cycle), ATmega has just one 8bit multiplier unit, which is too little for demanding tasks like real-time digital signal filtration. My objective is to find out whether it is possible to filter digital signal with ATmega. If the answer is yes, what is the maximum sampling rate and what output quality can be achieved.
The Design of a USB Device
Klír, Tomáš ; Strašil, Ivo (referee) ; Hudec, Antonín (advisor)
In theoretical part of this master thesis is analyzed USB 2.0 interface, including USB OTG. Mainly are described here properties which are good to know for USB device design. In brief is given here a structure of the FAT file system. Practical part contains design of OTG Device and it’s realization including implementation of libraries for communication via USB and for working with FAT file system.
Design and implementation of signal processing library using Android
Janovský, Martin ; Hudec, Antonín (referee) ; Trzos, Michal (advisor)
The diploma thesis solves the problem of design and implementation of library for digital signal processing on Android platform. It describes problems with development software on this platform. There is also a debate about portion of Android on market. It describes technologies and ways, that were used for developing an application. It also explains the efficient programming techniques, in some cases, offering alternative solutions and ways. Effectiveness examines from the perspective of processing power and memory consumption. Continues through analysis Android platform architecture, and some features of its system to the description of some of its parts. Gets up to the description of work with the audio data formats, or to work with files and various collections of data. Then description continues with functions and the application itself. The actual library is controlled through the user interface and some other functions. User select parameters of each signal to be processed. The signal can be generated or the recorded sound signal. After selecting the parameters of each filter, the user can play the output signal and observe the change. In other part different instruments are compared and discussed some improvements, which accelerate and improve the entire application. The conclusion summarizes the results and benefits of the entire diploma thesis.

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1 Hudec, Adam
1 Hudec, Andrej
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