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Sound level meter for embedded systems
Stejskal, Tomáš ; Schimmel, Jiří (referee) ; Botta, Miroslav (advisor)
The aim of this work is the design and implementation of a sound level meter for emdedded systems. It is designed sound level meter sensor. This sensor includes a microphone, microphone preamplifier and ADC. This sensor is connected to a development kit STM32F4 Discovery, where sound is processed. It is processed filtration, time weighting, calculation of sound leve and loudness weighting. The sound level is then sent via the serial communication USART. This thesis includes a theoretical analysis of noise and its human perceptions. It also describes the development platform used.
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Microphone array application
Toman, Vít ; Hanák, Pavel (referee) ; Fedra, Zbyněk (advisor)
Master’s thesis deals with description of issues of reading spatial audio signals using microphone array. Basic method of beamforming (Delay and Sum) is characterized on basis of chosen conception of the microphone array. Specific issues of audio detection and digital signal processing of converted audio signals are characterized and some ways how to solve the issues are adumbrated. Features and limitations of chosen ARM processor in the digital processing of multiple audio signals are described. Especially features and limitations of an internal A/D converter from the perspective of the beamforming are described.
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Control Unit for Autonomous Vacuum Cleaner
Matějů, Jan ; Kopečný, Lukáš (referee) ; Žalud, Luděk (advisor)
This paper is in introduction focused on review of robotic vacuum cleaning and evaluation of available products qualities. However the main focus of this paper is system design of all subsystems, control systems and PCD design of robot electronics. In this paper is also described a method for evaluating approximate distance of robot from the obstacle. There are also described problems of system design of IR proximity sensors. The last part of this work is development of control software for robot and its testing.
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FPGA based sound card for PC
Štraus, Pavel ; Kováč, Michal (referee) ; Kubíček, Michal (advisor)
This project deals with implementation of a first order Sigma–Delta AD converter on the FPGA. This ADC is design for an audio signal processing. ADC is build up partially from digital blocks implemented in FPGA (programmed using VHDL) and from few analog components placed external to FPGA. Output from ADC is PCM signal. Data from ADC is created UDP datagram, which is sent to PC via network connection. Income data are received in created program, which save data to text file. This text file is processing in MATLAB.
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Audio Interface for Embedded PC
Staroň, Martin ; Hanák, Pavel (referee) ; Schimmel, Jiří (advisor)
The scope of my master thesis is a designing computer sound interface including measurement of audio performance. This work is concerning both design analog front - ends and digital support circuits. The sigma delta Analog to Digital (ADC) and Digital to Analog (DAC) converters is included in this conception. Those converters has been made into two separate printed circuit boards. All signal paths in this circuitry are utilizing differential mode that are quoted as balanced among audio engineers. Modern circuit components are used in this design, such as fully differential operational amplifiers, electronically controlled gain preamplifiers, low drop linear stabilizers with low noise level, DC component suppression circuits and low jitter active components. Theoretical part of this thesis contains specification of choosed sound defitions, questioning audio program loudness leveling. Further criteria of suitable active and passive components are included. In this thesis the simulations of fundamental circuits block are meant likewise. Practical part involve complete layout of printed circuit boards of and prototyping. Designed prototype device has wide application usage. It is intended to use not only as industrial computers, but also as dedicated sound converters, measurement cards, mixing consoles, switching matrixes, active loudspeakers, embedded systems.
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Metal components testing equipment
Krupa, Zdeněk ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
This thesis deals with designing a portable indicator for measuring of content of ferromagnetic phase in non-ferromagnetic steels. The first part of the thesis describes the principle of sensor used in the indicator. A market survey is presented, with a description of selected indicators that are suitable for measurement of content of ferromagnetic phases. The following part deals with a design of the device hardware, which is focused on finding a suitable indicator concept. Circuits for battery charge, measuring chain and other circuits are designed in this part. The following part of the thesis describes the function of the software. First it describes the software for DSP, then the software for personal computer. The software for DSP has been programmed in the C language, the software for the personal computer in the C# language. The last part but one describes an inspectional measurement of the indicator. This measurement has been performed on testing samples as well as other materials. The final part presents a summary of the outcomes and provides recommendations for possible improvement.
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Communication assembly for optical cableless linking
Kapuš, Martin ; Kovář, Jan (referee) ; Kolka, Zdeněk (advisor)
This Graduate Thesis is about communication module for optical wireless network. This device read data from RS232 port and two analog inputs and sends it through internet to a remote Computer. Furthermore allows voice communication between local user on module and user on remote computer. Device allows communication with standard headphones and microphone, or with Bluetooth handsfree. Basic part is microprocessor MCF5223 and Bluetooth Ezurio BISM II module. Control program has been written in C language. Printed circuit is created by EAGLE program. This device is managed via web interface and settings have been stored into EEPROM memory. Work contains description of separately parts and blocks, source code of program, description of source code and printed circuit designs.
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