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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.
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Adaptation of Zephyr RTOS and Sound Open Firmware on a HiFi4 DSP of the NXP i.MX RT685 MCU
Staniček, Vít ; Strnadel, Josef (referee) ; Šimek, Václav (advisor)
Tato práce se zabývá analýzou mikrokontroléru i.MX RT685 vyráběného firmou NXP Semiconductors, v něm realizovaného Tensilica HiFi 4 DSP jádra a popisuje úsilí adaptace RTOS Zephyr společně s vrstvou Sound Open Firmware na tuto platformu. Aplikace demonstrující zpracování digitálních zvukových signálů nad těmito technologiemi je v této práci implementována rovněž. Práce je motivována záměrem jak efektivně realizovat techniky pro digitální zpracování zvukových signálů na této platformě, tak sjednotit jejich použití.
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Software-defined antenna array
Sedláček, David ; Prokopec, Jan (referee) ; Maršálek, Roman (advisor)
Hlavným cieľom tejto práce bolo vyvinúť demonštračnú platformu pre implementáciu algoritmov na odhad smeru príchodu signálu. Celkovo bolo opísaných šesť techník, ktoré boli následne implementované v Pythone spolu so simuláciami príchodu signálov. Bola vykonaná štúdia dostupného hardvéru, v ktorej boli porovnané rozdiely medzi na mieru prispôsobenými a voľne dostupnými riešeniami. Navrhli sa konkrétne hardvérové a softvérové konfigurácie pre praktickú implementáciu metód odhadu príchodu signálu. Na záver boli navrhnuté experimentálne merania na overenie účinnosti implementovaných metód. Vykonali sa testovacie merania a ich výsledky boli kriticky zhodnotené.
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Instruction Mapping Process on the VLIW Architectures
Mego, Roman
This paper deals with the process of instruction mapping on the digital signal processors. This process is used by the newly developed tool, which is designed for generating low-level assembly code for very long instruction word processors. The tool is suitable for creating cores of the signal processing algorithms.
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Design of sigma-delta digital-to-analog converter in CMOS technology
Soukup, Luděk ; Pristach, Marián (referee) ; Fujcik, Lukáš (advisor)
This master’s thesis deals with the issue of digital to analog conversion and possibility of its realization in digital circuits. Goal of this project is to design sigma-delta digital to analog converter with resolution of 14 bits and frequency band (0 ÷ 20) kHz. Main functional blocks: interpolator and modulator sigma-delta will be realized like digital structures. Reconstruction filter will be realized like an analog structure. For design a check of parameters of designed converter programs MATLAB and Simulink are used. Designed digital structures will be described by VHDL language.
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Automatic detection of tool fracture in metal sheet punching
Kluz, Jan ; Rajchl, Matej (referee) ; Brablc, Martin (advisor)
This Bachelor thesis deals with the design and subsequent implementation of the realtime fault detection system during the sheet metal punching process with a tool of small dimensions (0.5 × 12 mm). The proposed system is important for significant ease of the operator's work, acceleration of the process of production, as well as saving of the company finance budget. The first part of this thesis deals with the theoretical background of the studied issue. The following part is a brief theoretical introduction to the field of digital signal processing. The next chapter presents methods developed for fault signals detection including speed enhancing and data flow reducing algorithms. The main examined methods were: frequency peaks, frequency bands, autocorrelation, frequency correlation methods and machine learning including deep machine learning. Deep machine learning of the neural network achieved the best results overall. Features from time and frequency domain were used for purposes of creating the classification model using machine learning. The possibility of developing the predictive maintenance system is also described, including research of this area in a modern industry. Subsequently, the achieved results and their evaluation are presented. The end of this thesis is dedicated to the description of the implementation of classification system into realtime form and connecting this system to the punching press computer using Arduino Uno microcontroller and basic signal control electronics. The proposed system has been successfully assembled, tested and put into on-site testing.
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FFT implementation in FPGA and ASIC
Dvořák, Vojtěch ; Bohrn, Marek (referee) ; Fujcik, Lukáš (advisor)
The aim of this thesis is to design the implementation of fast Fourier transform algorithm, which can be used in FPGA or ASIC circuits. Implementation will be done in Matlab and then this form of implementation will be used as a reference model for implementation of fast Fourier transform algorithm in VHDL. To verify the correctness ofdesign verification enviroment will be created and verification process wil be done. Program that will generate source code for various parameters of the module performing a fast Fourier transform will be created in the last part of this thesis.
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Implementation of Simple Speech Recognizer in a Web Browser
Crkoň, Jakub ; Glembek, Ondřej (referee) ; Szőke, Igor (advisor)
The goal of this project is to implement simple speech recognizer for web browser. This paper describes fundamental components required for implementing speech recognizer and techniques which are used for optimization process of speech recognition in web browser. At first, the paper focuses on introduction of speech recognition theory. It describes individual parts and principles of speech recognizer. In next section, thesis describes design, implementation and principles of acceleration of speech recognizer with limited computing resources of web browser. The implementation is divided into modules making up the library for usage in web browser. The library is easily extendable and usable in various web applications. Finally, it discusses potential directions of development and usability of this project.
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Web-Based Demonstration of Linear Filtering
Novotný, Ondřej ; Bařina, David (referee) ; Černocký, Jan (advisor)
The aim of this work is to create a demonstration application of discrete linear filtering. The introductory section summarizes the theory of digital filtering and filter design. The following chapter describes the existing applets. Subsequently, the concept of the demonstration and its implementation are described. The final part contains tutorial examples of using the demonstration and summary of users' reactions.
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