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Audio speaker system with baffle made from alternative materials
Hüttl, Ondřej ; Schimmel, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This thesis firstly consists of an analysis and a description of materials suitable for construction of loudspeaker enclosures and a design of the loudspeaker system with the enclosure made of a synthetic stone. Electro – acoustics drivers have been described with a focus to a frequency range, a principle and a construction for an explanation of their function. Drivers based on electrodynamic principle have been described closely. An analysis of materials used for the loudspeaker enclosure production has been done and tradicional and alternative materials have been described as well. Specific modulus, density and stiffness have been taken as an objective evaluative criterion. An evaluation indicates appropriate properties of plastic, aluminum and stone based materials. The function and kinds of loudspeaker enclosures have been described. The function, properties and design of a vented box loudspeaker system have been described closely. The last part of this thesis is individual design of a two-way vented box loudspeaker system with the enclosure made of synthetic stone. A simulation of a driver behavior built in the enclosure and compensation circuits and crossovers design and simulation have been done. The enclosure has been designed with high stress to minimize negative effect of the enclosure to the final sound quality.
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Database of acoustic records
Terz, Marek ; Schimmel, Jiří (referee) ; Sysel, Petr (advisor)
The databsae of accoustical recordings is a web-based application, which is accessible with an usual web browser. There were used technologies, that are ussually used in web applications. This ensures, that the application is open for using by wide range of users. The application enables uploading WAWE files to the server and allows the user to add various description of the recordings. The application allows also comparing the quality of recordings, which were processed with some method for highlighting the accoustical signal from noise. This function is established by listening tests, which are open for every user, who wants to join the tests.
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Web Portal for Support of Education
Vicen, Šimon ; Povoda, Lukáš (referee) ; Schimmel, Jiří (advisor)
The thesis is focused on creation of web page based on wordpress development system in work with single sign-on login system via VUT web site in Brno. Thesis stepwise explains SSO atributes and ways how we can achieve this goal to make it work within given web services. Moreover, the thesis also explains functions of eduid.cz federation and technologies that it works with. Practical part is dealing with design of web, web applications, front-end cloud storage accessed by users and page working with login system via VUT sites and registering its users.
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Pre-Amplifier for MEMS Microphone
Ryšavý, Jindřich ; Honzík, Petr (referee) ; Schimmel, Jiří (advisor)
Thesis discusses the possibility of using MEMS microphones in measuring systems. Describes the characteristics of MEMS components and shows possible realization of analog to digital signal convertor when a microphone with analog output is used. Design of the amplifier is made with respect to low noise and low power consumption. Also is shown the possibility of using antialliasing filter as microphone frequency response correction at the same time.
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Digital audio effect based on wavelet transformation
Mikl, Martin ; Schimmel, Jiří (referee) ; Rajmic, Pavel (advisor)
The Bachelor's thesis deals about problems of digital signal processing. The first part includes function and use of VST Plug-In standard. It describes the history of the VST Plug-In interface, its use in hosting programs, there are a few words about another similar technologies and license terms of use. It is also briefly described the principle of wavelet transform, including some basic mathematical equations. Emphasis is placed on the Discrete-time wavelet transform and Fast wavelet transform. The knowledge of the wavelet transform led into concept of a block diagram with digital audio effect. From this concept has been made digital audio effect in VST Plug-In standart. The final part describes the solution of this effect, including analysis of its component functions. It describes the transmission of the important variables and its controls.
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Digital Transducer Array Loudspeakers System
Ležák, Petr ; Káňa, Ladislav (referee) ; Schimmel, Jiří (advisor)
This thesis discusses loudspeakers with a direct D/A conversion, possibilities of their technical solution and construction. It analyses classic conversion of digital signal to analog with D/A converters, amplifiers and loudspeakers and possibilities of its replacement by loudspeakers with a direct D/A conversion. The main part of thesis is devoted to design of a loudspeaker with a direct D/A conversion and a proper exciter for it. The exciter is designed from a block diagram to a specific electric circuit and printed circuit boards. The loudspeaker system is designed as well and the results of its simulations are included in this thesis. The device was constructed and tested. The program which generates digital harmonic signal on parallel port was written and electric and acoustic properties of the device was measured and discussed.
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Influence of Disposition of Opera Stage and Orchestra Pit on Theatre Acoustics
Berky, Martin ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This semestral thesis describes messurement of reverberation time, monaural and binaural impluse response Divadlo na Orlí during positioning of sound-source in orchestra pit and on the stage. Theoretical part describes messurement of reverberation time and objectiv criteria of soundfield quality in concert and opera. The practical part describes messurement in Divadlo na Orlí and computations in program Matlab. The thesis compares results in various configuration of theratre hall and describes common advices for operas in Divadlo na Orlí.
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Design and Realization of Acoustic Solution for Listening Room
Burda, Jan ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This work is focused on the problem of room acoustics and its analysis options. It describes the basic criteria of acoustic quality space, commonly used materials and acoustic tiles. It also deals with modeling and acoustic analysis of space using EASE. The third part of thesis is a detailed description of the design of acoustic elements based on resonance principle. The last part deals with the measurement of the reverberation time.
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