|
|
Complete design of three-way speakers
Jalový, Michal ; Petržela, Jiří (referee) ; Slezák, Josef (advisor)
This project describes complete design of Three-way speakers. The introduction discussed the basic theoretical knowledge to the understanding of loudspeaker system design issues with regard to the physiology of hearing, the theory of acoustics, speaker characteristics, types of enclosures and the use of switches. Furthermore, based on the formula calculated parameters of a loudspeaker cabinet and speaker points to the loudspeaker of the proposed speakers.The proposal also relies on the specific measurement properties of the selected speaker impedance. Finally all data are presented for practical implementation speakers.
|
|
|
Loudspeaker Box for Laboratory Measurements of Loudspeaker Impedance
Nevole, Tomáš ; Káňa, Ladislav (referee) ; Schimmel, Jiří (advisor)
In this thesis there are solved problems of design and construction of a universal modular loudspeaker box, which should serve for laboratory measurements of broadband electro-magnetic loudspeaker’s impedance. These measurements should demonstrate how the electric parameters are changed by changing the acoustic impedance of surrounding into which the speaker transmits. In the first part there is explained necessary theory for solving the task, such as way of sound’s transmission in the environment, variable sorts of speakers and their characteristics. A special focus is given to description of the electro-magnetic speaker’s parameters and construction that was used for the loudspeaker box. Then there are introduced needed mathematical formulas for algebraic design of the loudspeaker box, various types of the loudspeaker boxes (open, closed, vented) and their parameters. In this thesis there is also solved the problem with leaks and settled the matter, if it is better to build one modular box or 2 or 3 separate boxes. Most important characteristics are the impedance characteristics for this thesis but the SPL characteristics are also included. Unfortunately the simulating programs couldn’t generate the hodographs of impedance. After the algebraic calculations, in the thesis there are presented outputs from simulation programs Unibox 408 and WinISD 0.6. The outputs also are compared with the algebraic calculations. In the last part of the thesis there is already described the own construction of the loudspeaker box and presented results from the box’s measuring in the anechoic chamber (in the laboratory of electro-acoustic). The measuring of the modular impedance characteristic was realized on the single speaker and all the boxes. The measuring of the SPL (sound pressure level) characteristic was realized on the boxes only. All these results are compared with the calculations and simulations and the inaccuracies are substantiated in the end. The comparing of the manufacturer’s characteristics with the measured characteristics is also included.
|
|
|
Complete design of three-way speakers
Jalový, Michal ; Petržela, Jiří (referee) ; Slezák, Josef (advisor)
This project describes complete design of Three-way speakers. The introduction discussed the basic theoretical knowledge to the understanding of loudspeaker system design issues with regard to the physiology of hearing, the theory of acoustics, speaker characteristics, types of enclosures and the use of switches. Furthermore, based on the formula calculated parameters of a loudspeaker cabinet and speaker points to the loudspeaker of the proposed speakers.The proposal also relies on the specific measurement properties of the selected speaker impedance. Finally all data are presented for practical implementation speakers.
|
|
|
Comparison of analysis of speech in dependence on age and gender
Báňa, Josef ; Smékal, Zdeněk (referee) ; Atassi, Hicham (advisor)
This thesis deals with analysis of speech signal in dependence on the gender and the age of the speaker. We tried to investigate through the features to find the best set for the automatic classification of speakers. It also contains a brief discussion about the speech signal and its characteristics. We used a program called Praat for the speech analysis purpose. This program is also described in this work. We mainly focused on the suprasegmental features of speech. Our first step was to make our own speech corpus which should contain speech records from speakers with various age and gender. We made the analysis using Praat and reported it within this thesis. For the automatic classification purpose, twelve features were selected basing on there quality criteria and used with a neural network to classify the speakers to classes with different age and gender. As it was mentioned, a neural network was used as a classifier. We used “Neural Network Toolbox” in the Matlab program to create and train our networks.
|
|
|
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.
|
|
|
Design of Speaker
Kulich, Petr ; Sládek, Josef (referee) ; Zvonek, Miroslav (advisor)
Subject of this bachelor thesis is design of speakers. I aimed at sound system type 2.1, two satelite speakers and subwoofer. Main point of this design is simple portability and adjustability of speakers. With that corresponds used technology and ergonomic parameters. I took into account price and interier variability.
|
|
| |
|
| |
|
| |
|
|
The instrumentation of the theater hall
SUFČÁK, Pavel
The goal of this bachelor thesis is to summarize technical equipment of the theater hall in Prachatice, make calculations of reverberation times of specific hall and come up with adjustments to improve acoustic characteristics of examined hall. Come up with electroacoustic improvements of installed technical devices in the hall and make a list of improvements for future.
|
guest ::
