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Musical multi effects analysis
Masár, Igor ; Kubásek, Radek (referee) ; Friedl, Martin (advisor)
This work deals with guitar effect and guitar sound in general. Most widely used effects are described as well as their output time courses are simulated. There is a comparison of analog and digital effects. There is also explained the principal of guitar multiefects, described all parts of guitar efect chain and determined key parameters, which has the main impact on quality of final sound. It is used to describe a methodology for measuring multi-effects and the results obtained by this measurement. The last part deals with psychoacoustic measurements.
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Radar Altimeter for Ultramicro Airplanes
Imrich, Marek ; Maršík, Lukáš (referee) ; Zemčík, Pavel (advisor)
Radar equipment is an integral part of the aviation sector. It is very important to use a suitable module to guide ultralight aircraft during landing. The bachelor thesis is focused on the use of altitude radar based on the microwave sensor IWR6843ISK manufactured by TEXAS Instruments and its application in practice for ultralight aircraft. Its ability in conjunction with a computer is the altitude guidance of an ultralight aircraft to the runway by generating sound tones to indicate to the pilot the distance above the terrain. The main goal of this work is to design a model for the use of a microwave module in conjunction with a computer and its subsequent testing of the suitability for use in performing a landing maneuver. The aim of this work is to design a system that works with millimeter radar and its evaluation of usability in practice. The proposed module generates point clouds, which are then parsed, then the output data are suitably correlated, further transformed to the exact height of the aircraft above the terrain with subsequent sound interpretation to the pilot.
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Microphone Array for Estimation of Direction of Arrival of Sound
Kubišta, Ladislav ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This bachelor's work describe detection of direction receiving sound by analizing of the sound. Work is based on methods of time delay estimation. Programmed algorithm of estimation direction works on cross–correlation and some selected cross–correlation methods. Results of measuring, as programming sound, so sound recorded in laboratory conditions and real enviroment, are mentioned in conclusion. All calculations were done by platform Matlab
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Noise Reduction Methods in Transmissions
Benda, Matouš ; Zubík, Martin (referee) ; Prokop, Aleš (advisor)
Transmissions are basic elements of cars, which are important parts of everyday life. Expect targeted properties transmissions have a great influence for a total noise emitted by car. This thesis deals with possibilities of reducing this noise. In a first part of this thesis, reader is acquainted with the basic knowledge of acoustics, where are definitions of sound and mentioned noise. Another part analyzes transmission, as a mechanical component formed by smaller machinery units. This description is important for understanding transmission of vibrations in the structure, which further due to vibrate surroundings, which the human ear perceives as noise. These vibrations are mainly generated between meshing gears, and therefore the transmission error, which is responsible for these vibrations is analyzed in the next section. The last part discusses noise reduction methods, partitioned by the transmission components, in which are these methods applied.
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Determination of sound source orientation from multichannel audiosignal
Sumtsov, Artem ; Ripel, Tomáš (referee) ; Krejsa, Jiří (advisor)
The goal of this thesis was a research on appropriate methods of determination of sound source orientation and consequently its processing. This thesis describes subsequently four methonds of determination of signal delays between different channels. Each of these methods is evaluated with respect to suitability, usability, error rate and sensibility. In the next part the geometrical model for determination of the sound source orientation is described. Experimental solutions are processed for the situation with three microphones. Calculations are done in Matlab.
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Design of modern speaker body with usage of new technology
Kůst, Martin ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This diploma thesis deals with the analysis and design optimization of a speaker cabinet (enclosure) produced by the additive technology of 3D sand printing. The introductory part is devoted to the theory, both in the field of noise, vibration and the method of their calculations, as well as the theory of speakers and their systems. Numerical and experimental modal analysis is performed, which were compared to determine the mechanical properties of the new material, including material damping. This is followed by experimental and numerical harmonic analysis, with output in the form of a numerical model describing the behaviour of the structure during its excitation. The data are compared with a modal analysis of the internal acoustic space and the critical shapes and their frequencies are determined. At the end of the work, construction modifications are proposed to increase the rigidity of enclosures, the influence of which is evaluated on the created numerical models.
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Audio Saving Module
Strašil, Ivo ; Kouřil, Jiří (referee) ; Říha, Kamil (advisor)
The aim of this thesis was to design and construct an autonomous, hardware voice recorder/player module. The device is made as a compact, built-in component for a motherboard of a target appliance. During recording, the incoming analog voice signal is converted to a digital stream by an ADC with 16 bits resolution and 24 kHz sample rate. Microcontroller LPC2103 (ARM7TDMI core) processes data, recalculates resolution and sample rate, encodes and converts to WAV format and save into a FAT/FAT32 filesystem on a Secure Digital memory card. At playback, the process is opposite: the microcontroller reads file from the memory card, decodes the stream and sends it to a DAC and then to a reconstruction filter. So there is an analog voice signal at the output again. The firmware allows control by logic inputs or by a serial bus, processing of uncompressed WAV files or WAV files with A-law or IMA ADPCM compression, continual recording including automatic freeing of card space by deleting the oldest records and a usage of a voice emphasis filter or of a signal dynamic compression circuit.
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Acoustic emissions of buildings
Smažinka, Josef ; Uher, Pavel (referee) ; Rubinová, Olga (advisor)
The diploma thesis deals with acoustics with the main focus on acoustic emissions of buildings. The first part of the thesis aims to familiarize the reader with the field of acoustics as a whole. They will learn the basic concepts, quantities and relations that exist in acoustics. In the second part I focus specifically on the sources of noise in buildings and their surroundings, how can excessive noise affect health, what standards must be met and how to prevent excessive noise. The last part is devoted to practical measurements in the field, which is focused on real sources of noise in the city of Brno. The aim of this measurement is to compare the noise generated by buildings with other noises in the urban environment.
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Monitoring of hydraulic machines using acoustic emissions
Závorka, Dalibor ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
The goal of this diploma thesis is to clarify possibilities of usage of acoustic emission as a hydraulic machinery diagnostics tool. Especially for exposing presence of ruptures or cracks in the parts of machine, assuming changes in acoustic exposure of the part during operation. This clarification is based on series of simple measured experiments, which consist of monitoring the bolt placed in fluid stream inside of a pipe. This bolt was preloaded against inner wall of pipe by appropriate tightening torque. This preload is supposed to simulate effects of the size of rupture. High preload simulates small rupture or none in object and respectively small preload is supposed to simulate big rupture. A group of pressure sensors and accelerometers measures experiments and their evaluations are processed by script created in software MATLAB. Outputs of this script are charts with effective values of respective sensors from the entire record split into individual frequency spectrums. These charts compare spectrums of each configuration to judge effects of parameters changes.
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2x400W/8 ohms end amplifier
Káňa, Lukáš ; Balík, Miroslav (referee) ; Káňa, Ladislav (advisor)
Submitted text deals with a power amplifier intended for usage in music electronics. First part is related to the common problems of low-frequency amplifiers including principles and individual circuit wiring types. Next part is related to description of self-made power amplifier including wiring scheme diagram. The end of the text concerns about mechanical construction of mounting box and design of possible module layout inside a device.
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