National Repository of Grey Literature 31 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Multichannel audio DAC for laboratory measurements
Kristek, Tomáš ; Kufa, Jan (referee) ; Kratochvíl, Tomáš (advisor)
The content of this bachelor thesis is the design and construction of a multi-channel audio D/A converter, which will be used for laboratory use. It includes a digital signal input using SPDIF communication, the D/A converter itself, control of the D/A converter chip using the SPI bus, power circuits and symmetrical output.
Multichannel audio DAC for laboratory measurements
Kristek, Tomáš ; Kufa, Jan (referee) ; Kratochvíl, Tomáš (advisor)
The content of this bachelor thesis is the design and construction of a multi-channel audio D/A converter, which will be used for laboratory use. It includes a digital signal input using SPDIF communication, the D/A converter itself, control of the D/A converter chip using the SPI bus, power circuits and symmetrical output.
Photovoltaic Battery Charger with Sun Tracking
Knob, Martin ; Kufa, Jan
This paper describes the design of a photovoltaicbattery charger. The charger can track the sun and tilt the panelin azimuth and elevation. The device includes an Maximum PowerPoint Tracking (MPPT) regulator to maximise the energy from thephotovoltaic panel. This photovoltaic charger is designed for Liionbatteries and is equipped with appropriate battery protection.The system is battery-powered and therefore energy selfsufficient.Another purpose of the device is to measure accuratedata for further processing. It will measure the energyconsumption required for its operation and the energy producedby the photovoltaic panel. The device communicates wirelessly viaWi-Fi and sends the measured data to the Thingspeak server.
Photovoltaic battery charger with sun tracking
Knob, Martin ; Frýza, Tomáš (referee) ; Kufa, Jan (advisor)
This thesis describes the design of photovoltaic battery charger. The charger can tracking the Sun and tilt the panel in azimuth and elevation. The device includes an MPPT regulator to optimise the energy produced by the photovoltaic cell from the Sun. This photovoltaic charger is designed to charge Li-Ion batteries and includes appropriate charging and protection circuits. The charger is energy self-sufficient, which means that it does not need an additional power source. Another purpose of this device is to measure electrical quantities. The device sends the measured data wirelessly via Wifi.
Deep Learning based compression of 360° images
Budáč, Adam ; Boleček, Libor (referee) ; Kufa, Jan (advisor)
This diploma thesis deals with 360° image compression based on deep learning. The thesis describes the representation and deformations of a 360° image. It then describes conventional compression methods and methods using machine learning, deep learning and deep neural networks for 360° image compression. Part of the work is the creation of a dataset, which consists of ten 360° images, and the design of a framework that enables image compression using conventional codecs and algorithms based on machine learning, deep learning, and deep neural networks. Images from the dataset are compressed using five conventional codecs and four deep learning algorithms. The quality of compressed images is measured using seven objective metrics and one subjective test. As a result of the experiment, the conventional methods achieved higher compression quality than the methods using deep learning, and the computational complexity of the conventional methods is lower compared to the methods using deep learning.
Weight sensing of beehives with IoT connectivity
Havránek, Daniel ; Kufa, Jan
This paper focuses on designing a device that can measure some beehive parameters, that can inform users about the conditions in a beehive. These parameters are beehive weight, internal and ambient temperature, internal and ambient humidity, and air pressure. The device allows sending the measured data wirelessly through the GSM network and interpreting the results in appropriate way. Low power consumption is desirable due to working without the reach of the distribution network.
Advanced Algorithms for Compression of Videos with Ultra High Resolution
Soukenik, Ondrej ; Polak, Ladislav ; Kufa, Jan
In this paper, attention is devoted to advanced video codecs (HEVC, VVC, VP9 and AV1) and their utilization for compression of videos with Ultra High Resolution (UHD), also marked as 4K and 8K. A Python-based program employing FFmpeg multimedia framework is created to explore compression performances of such video codecs. It allows to automate encoding process and record all important information during the video compression (e.g. the required CPU time, time consumption, RAM usage). The performance of the video compression algorithms is evaluated in terms of objective quality metrics. First experimental results show that video codecs VVC and AV1 could replace HEVC and VP9 for 4K and 8K videos in the future.
System of gas and fire detectors in living spaces
Sedláček, Marek ; Kufa, Jan (referee) ; Frýza, Tomáš (advisor)
This bachelor thesis focuses on sensors and microcontrollers connecting via Wi-Fi to IoT networks. For that purpose, monitoring devices were designed. These devices monitor the presence of gases that can occur in households and in the case of exceeding the limits, they send an acoustic signalisation. The measured values and capacity of the battery are then sent by microcontrollers to the Internet via Wi-Fi.
Microphone cable tester
Vaněk, Pavel ; Kufa, Jan (referee) ; Polák, Ladislav (advisor)
This bachelor work deals with the electricial design and development of a handheld measuring device for microphone cables using time domain reflectometry method. The main aim of the work is to choose a suitable measuring method for locating faults on cables, develop electricial design and create its practical implementation. The build of firmware for the microcontroller unit is also the part of works. The measurement is based on a time-to-digital converter integrated circuit used in Light Detection and Ranging (LIDAR) applications. The designed device was completely implemented and tested by a set of practical measurements.
Mixing console for audio signals
Ryšavý, Ondřej ; Kufa, Jan (referee) ; Kratochvíl, Tomáš (advisor)
Bachelor’s thesis on the topic „Mixing console for audio signals“ deals with the design and production of a mixing console for mixing several independent audio channels. In the first step is designed a block diagram and then a circuit diagram. The overall configuration of the mixing console is: Four mono inputs, designed as a combined XLR/JACK 6,3 mm input, where you can connect a microphone or other mono signal (not both at the same time), two stereo inputs RCA(CINCH). Each channel allows five-band frequency correction, panorama, signal level control and signal level detection. The output is realized per line connectors (for connection to the amplifier), headphone output and headphone amplifier. After design, the mixing console is producted, revived and then measured in an audio laboratory.

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