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Audio Effect Design Based on Delay Line
Bilkovič, Ondrej ; Balík, Miroslav (referee) ; Říha, Kamil (advisor)
The aim of this thesis is the design and construct a commercial guitar delay stomp box, by implementing the analogue technology BBD. The thesis includes explanations of theoretical principles needed in order to design such device. The aim is also to elaborate on the process of designing the individual sections of the device and testing their properties, and testing the properties of the device as a whole.
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Standard baffle - laboratory device
Hodinka, Tomáš ; Říha, Kamil (referee) ; Balík, Miroslav (advisor)
The purpose of this project is the design and the construction of a laboratory preparation for loudspeaker measurements, a standard baffle. Standard baffle is a rectangular panel with a loudspeaker placed eccentrically. Measurements with this baffle are then done in an anechoic chamber. The main purpose of a standard baffle is the ability to measure loudspeakers without the effect, that is caused by the pressure properties of a closed baffle and without an acoustic short circuit. The standard baffle is designed, so that it is self-supporting, transferable by 2 people, easy to be stored, modular and able to support loudspeakers that are up to 12 inches in diameter. The designed baffle is detachable into 3 parts. The base, the panel, and the inserts. The base is a big, heavy board with a key on the upper side. This key fits into a key groove in the panel and that allows the two parts to assemble. The plane is made of four layers of different types of plywood. That allows the design to make a compromise between the toughness and weight. The inserts are designed, so that the replacement and manipulation of loudspeakers during measurement are as past and as simple as possible. During measurement the loudspeakers are mounted in their respective inserts, which can be mounted and dismounted from the standard baffle without any tools. The test measurements demonstrated that the standard baffle is unsuitable for reference measurements. Resonance of the plane, reflections from the base, refractions from the outer edges of the baffle and potentially different causes unduly distort the results of measurements. These distortions are displayed with a considerable consistency even between different loudspeakers. This indicates that these distortions could be filtered oud by, for example, using a specialized software.
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Speech quality objective methods
Kovařík, Jiří ; Balík, Miroslav (referee) ; Sysel, Petr (advisor)
In terms of the bachelor´s thesis was created a computer programme for the quality speech estimation. This programme was created in the MATLAB programming language using GUI programing environment. Through the use of created programme was processed group of records disturbed by various noises from the real environment. As a speech quality objective methods was chosen classical SNR, Segmental SNR, PESQ, Itakura distance, Itakura – Saito distance For this programme were created service instructions. In this work are these speech quality objective methods described furthermore the process of the human voice creation, speech modeling and a linear predictive coding.
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Power LED control using ATtiny
Martynek, Tomáš ; Kubánek, David (referee) ; Balík, Miroslav (advisor)
Target of this bachelor’s thesis is to develop suitable DC/DC converter for driving power LED with Atmel Tiny micro. There is PHILIPS white power LED – Luxeon Star/O as the light source used. Micro’s AD converter measures current through this LED. This value is used for current driving using PWM micro output. Whole device is accumulator powered, design allows usage of three AA alkaline batteries instead of NiMH accumulators. During design phase was choosing between 2 and 3 AA batteries power solution. Because of the longest working time, the final solution uses 3 AA batteries – in this configuration works the flashlight about 7 hours. Flashlight can charge NiMH batteries from external constant current power source. Micro controls whole charging process and disconnects accumulators from current source after full charge using method of negative voltage change. Timer method is backup method in case, when negative voltage drop is very small – the charging time is limited to max. 9 hours. Micro can detect bad or non-possible charged cells.
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Acceleration of Vector and Cryptographic Operations on x86-64 Platform
Šlenker, Samuel ; Martinásek, Zdeněk (referee) ; Balík, Miroslav (advisor)
The aim of this thesis was to study and subsequently process a comparison of older and newer SIMD processing units of modern microprocessors on the x86-64 platform. The thesis provides an overview of the fastest computations of vector operations with matrices and vectors, including corresponding source codes. Furthermore, the thesis is focused on authenticated encryption, specifically on block cipher AES operating in Galois Counter Mode, and on a discussion of possibilities of instruction sets for cryptographic support.
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Basscomb design
Gomola, Roman ; Balík, Miroslav (referee) ; Káňa, Ladislav (advisor)
The following text describes the design basscomb intended to strengthen and reproduce bass. In individual chapters is described as electrical and mechanical design of the combo, which is actually a type of enclosure port tube with built-in amplifier and the corrective circuits. The first part is devoted to a description of the speaker MONACOR GF-650 and amplifier design based on the IO LM 3886, which includes a power supply of the entire facility. The next section describes the correction amplifier, solutions five-band octave graphic equalizer. In penultimate section describes the selection and design of the baffle, its production and finishing. The last section is devoted to the measurement of manufactured.
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Big Muff Type Distortion Guitar Effects
Beránková, Tereza ; Balík, Miroslav (referee) ; Kubánek, David (advisor)
Presented thesis is focused on construction and functionality of distortion effects and equalizers. It investigates the possibility of their usage in guitar distortion effect called Big Muff which consist of several blocks. One of them is tone control and this thesis intention is to implement equalizer instead. Part of this thesis is also creation of a laboratory task focused on measuring and understanding to this guitar effect
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Tube guitar amplifier
Mostecký, Jan ; Balík, Miroslav (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor thesis studies guitar tube amplifiers. The thesis introduces basic concepts behind electrical valve circuits. After that there is a scheme of a modified vacuum tube amplifier designed by the author. The functionality of the design has been verified via computer simulation. Designed amplifier was built afterwards and its functionality was verified via measurements.
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