National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
Automation of measurement of directional characteristics of sound sources
Nimmerrichter, Benjamin ; Liska, Matej (referee) ; Schimmel, Jiří (advisor)
This bachelors thesis deals with the topic of automating the measuring of directional sound radiation characteristics of sound sources with the use of one to sixteen, possibly thirty-two microphones connected to an audio device, which supports the ASIO driver technology, which is connected to a computer with an installation of the MATLAB software. In the scope of this thesis a program was created, which is capable of measuring the 2D and 3D directional characteristics of sound sources and it can show the frequency spectrum of the signal. This work addresses the problematics of the effective value of discrete signals, calibration of microphones for measuring sound pressure level, the calculation and measuring of the level of acoustic pressure in dB (SPL), the autocorrelation of a discrete signal, plotting of the measurement in a polar or spherical plot and the calculation of the signal to noise ratio. This thesis contains a theoretical introduction to the measurement and to the propagation of sound, then the composition of the program and the measurement and an assessment of the measured results.
Audio Amplifier with Network Streaming and Sound Equalization
Liska, Matej ; Zeman, Kryštof (referee) ; Štůsek, Martin (advisor)
Diploma thesis contains the theory for the design and realization of a prototype audio amplifier device with the possibilities of digital or analog input content. It approach the features of D/A converter, analog filtering, volume control and amplification. Besides others, it describes the regulation of supply power voltages for individual active parts of device and approaches the software audio platform for acquisition and processing of audio data, including equalization. The thesis contains an general schematic design, created placement of individual components on board, including their table of descriptions and evaluation of the achieved results, including measured values and graphs.
Analýza tvarů půdních agregátů na lesních půdách ŠLP Křtiny
Liška, Matěj
The thesis deals with soil aggregates and their shapes. There were collected soil samples commonly occurring in ŠLP Křtiny. It was a cambisol, brown soil, luvisol, rendzina and ranker. Sampling was made always in a coppice and high forest. In these soils it was carried out due to grain size analysis to determine clay content and digital analysis focused on the water-stable aggregates external structure. There was determined volume and the surface of the aggregates and the mutual relationship. It was found that the aggregates of the same soil at different ages show a trend of size and shape change. These changes depend on the content of clay and organic matter. Catalog was created from digitally scanned aggregates that displays aggregates shapes with its parameters and summarizes the basic info of soils.
Experimental Software Musical Instrument Controlled by Light Color
Liska, Matej ; Indrák, Michal (referee) ; Dlouhý, Dan (advisor)
Bachelor thesis contains the theory for realization of experimental software instrument controlled by light color. It brings knowledge of sound and light waves and color pro- cessing. Besides others, it describes process of generating digital signals using additive synthesis, methods of signal processing and sonification techniques. It solves program- ming possibilities of creating, processing, playing and saving digital audio signals. The audio source is written in Java language on the JavaFX programming platform.
Phylogenetic connections of human locomotion in sport
Liška, Matěj ; Kračmar, Bronislav (advisor) ; Slezáková, Pavla (referee)
Title: Fylogenetic aspects of human locomotion Objectives: To find fylogenetic connection between human locomotion and animal locomotion as animal are considered to be our predecessors. Methods: Study and analysis of accessible literary sources. The results gained in the research will be generalized and used to find the fylogenetic connection of human and animal locomotion. Results: Similar locomotive principles happened to be found in connection with first vertebrates, amphibians, birds, mammals and humans. The need for presence of punctum fixum was also found to implement the crossed motion model. There were summarized necessary adaptations to bipedal human locomotion. Key words: punctum fixum, kvadrupedal crossed model, human locomotion, motion, development
Vyhodnocení produkce vánočních stromků ze soukromé plantáže
Liška, Matěj
The bachelor thesis deals with Christmas tree production and general economic evaluation of Christmas tree growing on a plantation. It consists of Christmas tree production and also planting, harvesting and selling Christmas trees. Some species useful for growing Christmas trees and particular technological processes leading to successful growing of trees on plantations are described. The thesis contains a market research based on prices of Christmas trees in the Czech Republic and a questionnaire, the aim of which is to explore public attitude to Christmas trees. The results show that 85 % of respondents prefer a real Christmas tree to an artificial one.

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