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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 with external devices by I2C bus
Prax, Jakub ; Šebesta, Jiří (referee) ; Frýza, Tomáš (advisor)
This diploma paper deals with the data bus line I2C and a supportive demonstration tool for the subject Microprocessor technology taught at the Radioelectronics faculty. The data bus line I2C is convenient when short-distance data transmission with restricted spatial possibilities is required but high velocity of data transmission is not necessary. The tool is compiled in such a way that enables it to also perform other tasks apart from those dealing with the I2C data bus line. The data bus line in the tool is utilized for transmission of date, time, temperature, data for the D/A converter, data from and to the EEPROM memory and data to 16 bits expander.
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