|
|
Stereo audio amplifier with class D and SD modulation for laboratory measurements
Kováč, Martin ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
This thesis deals with the technology of amplifiers with sigma-delta modulation. The primary aim was to the design and testing of an amplifier with sigma-delta modulation and its use in laboratory exercises in the subject BPC-AUD. In the power part, the SSM3302 stereo amplifier from Analog Devices is used, which uses three-layer output sigma-delta modulation. This amplifier will deliver output power into a 4 load. Part of the work is the design and construction of a control block consisting of a correction amplifier controlled by digital potentiometers from Arduino nano.
|
|
|
Stereo ADC and DAC converter for audio
Koiš, Christopher ; Polák, Ladislav (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor's thesis deals with the problem of designing a programmable digital sound processor with its input connected to a device, such as a personal computer or a mobile phone, and an output intended for headphones. One segment of this thesis handles digital filters, specifically FIR and IIR filters. The MATLAB environment was used to design the filters shown in this thesis. Furthermore, the buses SPI, I2C and I2S that are used on the device are described. The parameters of individual functional blocks are summarized, and the designed circuit schematic are displayed in this thesis. In the practical part of this thesis a prototype printed ciruit board was designed and its' electrical parameters were measured and processed. Finally, the last part of this thesis describes the inner workings of the program that the microcontroller executes.
|
|
|
Measurement of the SISO/MISO Signal in the DVB-T2 System
Buchta, Šimon ; Kratochvíl, Tomáš (referee) ; Polák, Ladislav (advisor)
Tato bakalářská práce je zaměřena na měření a analýzu televizního signálu druhé generace digitálního pozemního vysílání (DVB-T2), zahrnujíc různé přenosové techniky a chyby, jež mohou vznikat v tzv. OFDM modulátoru. Pro tento účel bylo navrženo a zrealizováno měřící pracoviště. První část práce je věnována zkoumání a následnému zhodnocení výsledků měření reálného DVB-T2 signálu vysílaného v České republice. Druhá část této práce se zaměřuje na měření signálu DVB-T2 s odlišnou konfigurací, na příklad užití MISO přenosové techniky a přídání vlivu chyb v OFDM modulátoru a výkonového nevyvážení mezi vysílači. Tyto konfigurace jsou zkoumány v různých kanálových modelech pro fixní a mobilní příjem. Získané výsledky jsou zkoumány nejen z pohledu konvenčních objektivních parametrů (MER, BER), ale také z pohledu použitých měřících přístrojů a přijímačů (set-top-boxů).
|
|
|
Programmable audio equalizer with DSP processor
Tůma, Filip ; Kufa, Jan (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor thesis deals with the design and construction of a 7 band digital equalizer. The main component is a DSP audio codec TLV320AIC3254 from Texas Instruments with intergrated ADC and DAC converters and internal amplifiers. For communication, an Arduino UNO is used, which controls the audio codec registers via an I2C communication interface.
|
|
|
Photovoltaic laptop charger with wireless connectivity
Komár, Josef ; Kratochvíl, Tomáš (referee) ; Kufa, Jan (advisor)
This thesis deals with the design and construction of a photovoltaic charger designed primarily for a laptop. The solar charge controller works using the MPPT (Maximum Power Point Tracking) principle and is controlled by a ESP32 microcontroller. The control algorithm constantly searches for the maximum power point, thus achieving the maximum possible power and efficiency of the PV panel. The produced energy is then stored in the battery system, which has a BMS including protections and cell balancers. The charger includes an adjustable 18 – 22 V output for powering a laptop computer and 5 V output for powering devices via USB. All important parameters (voltages, currents and powers) are sent wirelessly by the charger via Wi-Fi interface.
|
|
|
Stereo audio amplifier with equalizer and remote control
Lipenský, Lukáš ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
The bachelor thesis deals with the possibilities of realization, design and construction of a stereo audio amplifier with a pre-assigned ten band graphic equalizer. The amplifier operates in class D and has an output power of 2x140 W into a 4 load, speakers. The signal adjusted by the equalizer can be amplified in the amplifier and reproduced by the speakers or transmitted to a remote receiver, such as headphones, via a bluetooth module. The equalizer has 10 bands for adjusting the frequency characteristics of the signal and the signal level (volume). The settings of the individual, predefined characteristics according to the type of music you are currently listening to can be selected using the IR remote control.
|
|
|
Application of Business Intelligence in a Corporate Environment
Suszterová, Sandra ; Kratochvíl, Tomáš (referee) ; Luhan, Jan (advisor)
The diploma thesis deals with the design and implementation of a reporting solution using a Business Intelligence tool within a selected corporate environment. The ideal Business Intelligence solution will be selected based on the company's defined requirements and an analysis of available options. The final outcome of the thesis will be an automated reporting system delivered to individual users and also integrated within the company's own business application, presented in a visually attractive and informative way through appropriate Business Intelligence tool.
|
|
| |
|
|
Audio pre-amplifier for two satellites and subwoofer
Štaud, Stanislav ; Brančík, Lubomír (referee) ; Kratochvíl, Tomáš (advisor)
The aim of this thesis was to design, simulate and construction audio pre-amplifier for two satellites and subwoofer and monolithic amplifier for subwoofer in the class AB. Audio pre-amplifier provides bass, treble and switch loudness volume control. It includes subsonic filter and active crossovers Sallen-Key with approximation Linkwitz-Riley. There are low noise operating amplifiers LM833 and TL081 at the place of active amplifiers with very low distortion. End-amplifier can delivers power 50 W to 4 ohms. Of consists delayed switch speaker and supports security against direct voltage on the output of amplifier.
|
|
|
Measurement of diversity broadcasting in DVB-T2 standard
Koblischka, Vítězslav ; Kratochvíl, Tomáš (referee) ; Polák, Ladislav (advisor)
This bachelor thesis compares standards for digital and terrestrial television broadcasting of first-generation DVB-T and second-generation DVB-T2. It focuses particularly on the impact of interference in transmission media simulated by transmission channels for fixed, portable and mobile reception of terrestrial digital signal. Furthermore, the thesis compares SISO broadcast with the diverse MISO broadcast in DVB-T2 standard and evaluates the impact of the mode on error rate depending on the selected transmission channel and systems parameters that were used.
|
guest ::
RSS feed.