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Digital Audio Signal Feature Extraction and Modification in Dynamic Plane
Kramoliš, Ondřej ; Sysel, Petr (referee) ; Schimmel, Jiří (advisor)
This thesis deals with basic methods of root mean square and peak value measurement of a digital acoustic signal, algotithms to measure audio programme loudness and true-peak audio level according to recommendation ITU-R BS.1770-1 and digital systems for control of signal dynamic range. It shows achieved results of root mean square and peak value measurement and results of implementation of dynamic processor with general piecewise linear non-decreasing static curve and algorithms according to recommendation ITU-R BS.1770-1.
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3D Audio Standards in Home Theatre Environment
Kováč, Daniel ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
This work deals with object-based sound. There is a description of the difference between channel-based and object-based sound and the development of this sound to today's form. Subsequently, formats that work with objects are described, and they are compared with each other. MPEGH-3D Audio format is specified here, which is a standard today, and also the method of positioning the virtual audio source by vector-base amplitude panning. It also describes how an encoder and decoder supporting speaker configurations 5.1.2, 5.1.4 and 7.1.4 has been developed according to the MPEG-H 3D Audio specification. Lastly, the work deals with the problem of panning the object sound to the standard configuration and there is also a mention of the listening test.
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Modeling of Linear Distortion of Audio Devices
Vrbík, Matouš ; Sysel, Petr (referee) ; Schimmel, Jiří (advisor)
Methods used for correction and modeling of frequency response of sound devices are discussed in this paper. Besides classic methods of digital filter design, more advanced and complex numerial methods are reviewed, Prony and Steiglitz-McBride in particular. This paper focuses on structure utilizing parallel sections of second-order IIR filters. Methods for calculating coefficients of this structure are presented and later implemented. For selected method, utilizing dual frequency warping, an interative algorithm for automatic calculation of parameters necessary to filter design is implemented - so called Particle Swarm Optimization. Six ways of evaluation filter design precision are presented and the results are compared. Functions realizing filter design are implemented in C++, MATLAB and Python. A VST module simulating the filter in real time is also provided.
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Recording and Processing of 3D Sound for Sound Design
Šilar, Prokop ; Rund, František (referee) ; Schimmel, Jiří (advisor)
Objective of this thesis is research of available tools for sound production of 3D and 360° video, ambisonic theory elaboration, selection and description of plug-in moduls to be used for teaching ambisonics. These ambisonic-related formats are described: A-format, B-format (FuMa), B-format (AmbiX), C-format and D-format. Loudspeaker configurations for ambisonic recordings playback are also described (loudspeaker configuration according to the ITU-R BS 775-3 recommendation and quadrophonic loudspeaker configuration). Also, these plug-in moduls are described: Sennheiser AMBEO Orbit, SoundField by Rde, Soundfield SurroundZone2, Ambisonic Toolkit for Reaper and Facebook Audio 360 Spatial Workstation. Moreover, there is described ambisonics-related work in Reaper, Cubase and Nuendo DAWs and there are demonstrational projects for work with ambisonics demonstrating basic signal operations and spatial panning of close-miked sound sources in the DAWs and plug-in modules in question. These plug-in modules and their use in DAWs in question are described in purpose of basic foundation of ambisonic-related teaching at this school with the use of instruments just available. Even theory described here can be used as teaching foundation compiling the basics of the problematics in question. Demonstrational projects made for this thesis can be used directly in the laboratory exercises.
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Loudspeaker design for home environment
Šafer, Radim ; Schimmel, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
The subject of my bachelor‘s thesis is a design of the loudspeaker for home listening. Foremost I focused on simulations of the loud-speakers, which I use to a design itself. The loudspeaker is a two-way and stereophonic, which is optimised for a woofer Beyma 6B30/P and a tweeter Beyma T2010. The enclosure is closed, made of the M.D.F. material. The vibration damping is ensured by a polyester damping cottonwool. The maximum standardised wattage of the loudspeaker is 50 W, nominal impedance is 8 ?, internal capacity is around 15 litres, sensitivity 90 dB and weight 10 kg.
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Electronic Booking System for Laboratories and Laboratory Equipment
Povoda, Lukáš ; Mach, Václav (referee) ; Schimmel, Jiří (advisor)
The main aim of this paper is to create the database structure and the web interface of the reservation system. This system is for the reservation of the laboratories and of the measuring equipement (for hire). System was created by the most widely language intended for creating Web application - language PHP, and database system MySQL, specifficaly base on the storage system InnoDB formed for relation database and the transaction. This paper descbires the princip of the work of modern patterns like Model-View-Presenter or Dependency injection and their both practical use. The code of the web application has been based on PHP framework Nette, on PHP library dibi created for database MySQL, on library mPDF created for generation of the PDF files from HTML code. System has been created according to convention of framework Nette and already mentioned design pattern, so it means that all changes such as spreading, changes of implemented funcions, changes of design of web interface, work with the datas or implemenation of the new interface and of new funcions will be simpler and take less time then for example the use of the system without convention and pattern.
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Real-Time Audio Signal Processing in Embedded Computer
Novák, Pavel ; Trzos, Michal (referee) ; Schimmel, Jiří (advisor)
The Bachelor thesis deals with operating systems, particularly with Windows Embedded Standard 7 for built-in computers. The first part of the thesis is focused on the most compact installation development. The second one is oriented on sound card and sound interface ASIO driver installation. The application for the real time sound processing inTone is also described in detail there.
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XML-based automated generation of conference proceedings
Repka, Branislav ; Schimmel, Jiří (referee) ; Rajmic, Pavel (advisor)
This document deals with creating materials using XML and XSL for the conference. Specifically, Automated generation Conference proceedings in format PDF and HTML page and business cards to organize a conference. This paper describes the XML technology and their applications. Also work includes the design and creation of business cards and conference proceedings using XML technologies.
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Influence of drivers position on the characteristics of the loudspeaker system
Bičan, Jan ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
This thesis deals with the measurement and description of properties of the two-way variable modular loudspeaker system marked as OM-3, especially the influence of the mutual position of drivers on its characteristics. The thesis examines individual factors taking their contribution on characteristics of the loudspeaker system in total. Further it measures and evaluates options of compensations of mutual position changes of drivers using an all-pass filter. Within this thesis is also included laboratory task preparation which is focused on this problematics.
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