|
|
Optimization of the Bank Loan Application
Skovajsa, Radek ; Kořínková, Martina (referee) ; Čižinská, Romana (advisor)
The work is based both on theoretical basis and practical working processes of banks for assessing client's financial standing in Czech market environment. Basic preconditions for successful credit allocation to a business entity will be set along with evaluation of the importance of information from a credit requisition form's compulsory enclosure. A detailed analysis of the client's economy from a bank perspective will be succeeded by identification of critical risks and positives of an applicant's financial position.
|
|
|
Two-way stereo speaker system
Kočvara, Pavel ; Polák, Ladislav (referee) ; Kratochvíl, Tomáš (advisor)
The Bachelor thesis deals with design of a passive two-way stereo speaker system with performance 50 W RMS / 8 for normal domestic use. With respect to its sensitivity 90 dB/W/m mid-range speakers Beyma 5MP50/N and tweeter Beyma T2030 were used. The enclosure is a type of bass-reflex and it is made of MDF material with internal damping from polyurethane coat.
|
|
|
Design and Construction of Transmission Line Loudspeaker Cabinet
Dobiášovský, Jiří ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
Thesis is dealing with the topic of design and construction of the transmission line loudspeaker enclosures. Theoretical part is focused on speaker choice, its design elements and their influence on parameters of the speaker. Individual parameters of the speaker, mathematical equations for their determination and choice of suitable speaker for transmission line loudspeaker enclosure is furthermore discussed and defined. Principle of transmission line enclosures is discussed together with its advantages and disadvantages compared to other types of enclosures. The individual design elements and their influence on the resulting characteristics of the enclosure are described. In the practical part, with regard to the facts stated in the theoretical part of the work, a suitable speaker is selected and the subsequent design and construction of a variable transmission line speaker is described. This might serve as a teaching aid in future. Part of the work is also a description of procedures for measuring loudspeakers with multiple speakers or resonators.
|
|
|
Compensation of loudspeaker measurements using standard baffle
Štěpáník, Jiří ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
The frequency response of the loudspeaker is one of the key data that needs to be known, for example, when designing a speaker cabinet or speaker system. The frequency response should be achieved with the highest possible accuracy and with a minimum of distortion. How to achieve such characteristics is described in the standard ČSN EN 60268-5, which states as one of the ways the use of standard enclosures. Except for the standard baffle, these baffles have correction curves for the measured characteristics described in the standard. However, this does not mean that the standard baffle does not distort the measurement. The aim of this work is to analyze the distortion of measurements caused by this baffle and other elements and their compensation. The work contains a description of certain parts of the standard ČSN EN 60268-5 with focus on the standard baffle. Especially on its construction and methods of measuring the speakers mounted on it. Several test measurements were performed within the work. These measurements were performed in a anechoic chamber with speakers mounted on a modular standard baffle, which is a modification of the standard baffle which is also described in the work. The measurements performed include the measurement of frequency characteristics at different distances of the microphone from the speaker at different positions of the baffle in the anechoic chamber. The test measurements show that the modular standard baffle and anechoic chamber cause measurement distortion. In other measurements, the distortion by the anechoic chamber is minimized and the distortion caused by the base of the modular standard baffle is completely eliminated. The thesis then presents the theory of sound diffraction at the edges of a standard baffle and the theory of the extended Biot-Tolstoy-Medwin method of modeling these diffractions using numerical calculations. Based on this theory, software compensation of diffraction distortion was performed in Matlab. It is not entirely clear from the results of the compensation to what extent it can be considered successful. It can be speculated that it only works on certain frequencies. It is necessary to verify the functionality of this compensation method by another test measurement.
|
|
|
Design and Implementation of Active Loudspeaker System with Digital Input
Uchytil, Filip ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
The work is focused on a design of an active loudspeaker system with a bi-amp amplifier and a digital input. There is described the theory of a loudspeaker enclosure design and its practical implementation. Furthermore the work deals with a design and construction of input circuits such as a preamplifier, Baxandall tone control, active crossover, all-pass filter and S/PDIF. On the basis of the amplifier´s theory the optimal construction of amplifiers and their design are selected. The complex design of the loudspeaker box is devised so that it would reach a maximum acoustic power during the preservation of a low distortion.
|
|
|
Up-firing loudspeakers for 3D Audio
Pešek, Marko ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
This bachelor theses dealing with study multichannel 3d audioformat Dolby Atmos and parameters of up–firing loudspeakers, which assures overhead audiosignal reproduction coming towards hearer. According to the knowledge is made proposal of up–firing loudspeakers, fabrication and measurement their properties.
|
|
|
Variable Two-Way Loudspeaker Cabinet - Laboratory Tool
Rehák, Jan ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
The objective of this work is to build a two-way loudspeaker system that will enable changing loudspeaker topology in both vertical and horizontal axes and to suggest two laboratory tasks. The theoretical part of this work will briefly discuss loudspeaker crossovers. Then it will discuss how topology of loudspeakers in a loudspeaker system can affect its behavior at crossover frequency. Frequency characteristics of various loudspeaker baffles will be shown. On these, the effect of a baffle’s exterior on its behavior will be discussed. A two-way loudspeaker system will be designed. The construction process and drawings of each part are also included in this work. The finished product will be tested and, following from these tests, a conclusion will be drawn about the validity of the theoretical assumptions of its design. After that, appropriate parameters of a crossover for the two-way loudspeaker system will be chosen.
|
|
| |
|
|
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.
|
|
|
Transmission line loudspeaker enclosure property measurement
Pavlik, Miroslav ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
The aim of the master thesis is to describe the characteristics of transmission line loudspeakers. Getting to know the modular transmission line enclosure, which allows changing the position of the speaker and also the combination of two mid-bass speakers. Another goal is the study of types of measurements of frequency characteristics and the subsequent processing of the procedure of composing frequency characteristics in the free field. One of the main points of the diploma thesis is the demonstration of individual properties of the enclosure using frequency characteristics. The last point is the creation of a laboratory assignment.
|
guest ::
