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FPGA-Based Sound Acquisition Prototype from MEMS Microphone Array
Liska, Matej ; Tomešek, Jiří
This paper presents a comprehensive exploration of an Field Programmable Gate Array (FPGA) prototype designed for efficient data acquisition from Micro Electro Mechanical Systems (MEMS) microphones through a Time Division Multiplexed (TDM) interface. The primary focus lies in the seamless integration of software and hardware elements, showcasing the implementation of IP cores for controlling TDM peripherals, generating clock signals, and facilitating communication with the Future Technology Devices International (FTDI) chip. The paper underscores the flexibility of the device design, which can be seamlessly deployed across various FPGA boards, thereby mitigating dependency on specific hardware models. Leveraging a large number of GPIO pins on the FPGA board, the PCB design incorporates multiple TDM buses and efficient communication channels with the FTDI chip, streamlining data transfer to the PC. This work not only presents a functional prototype but also lays the groundwork for future advancements in FPGA-based sound acquisition systems, promising enhanced versatility and efficiency in audio signal processing applications.
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Spatial audio processing of a spherical microphone array
Tomešek, Jiří ; Honzík,, Petr (referee) ; Liska, Matej (advisor)
The diploma thesis focuses on the processing of spatial sound from a spherical microphone array, their properties, and the principles of capturing. It further explains the principles of operation of MEMS microphones and subsequent implementation. The interface between the microphone array and the computer is created using a programmable gate array along with a USB converter. The thesis outlines a suitable method for software implementation for communication, control, and interconnection of specific hardware. The implementation of individual functionalities was carried out and explained using the VHDL programming language in an FPGA. Data reception from the microphones via a TDM interface, control logic, and communication between the FPGA and the computer through an FTDI interface were implemented. Within the thesis, an application was also created in the Matlab environment for controlling the FPGA and processing data from the microphones, including a graphical user interface. The application implements the ambisonics method and a method for processing the audio signal using spatial filtering.
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Measuring Loudspeaker System for Laboratory Practices
Tomešek, Jiří ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This bachelor's thesis deals with the design of a two-way speaker system and a variable baffle for a subwoofer for the purposes of demonstration measurement in the subject of Electroacoustics. The theoretical part explains the individual speakers, TS parameters and formulas for their calculation. Furthermore, various types and constructions of baffles and audio crossovers. Using the simulation program LspCAD, the designs of closed and bass reflex baffles with right and wrong parameters were fine-tuned and simulated. The proposed crossover for a two-way speaker system was also simulated. Drawing documentation was prepared for the designs. Furthermore, the baffles and crossovers were implemented, and their characteristics were measured. Finally, the existing laboratory tasks were reworked so that students could use the implemented baffles and the chosen design procedure.
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Measuring Loudspeaker System for Laboratory Practices
Tomešek, Jiří ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This bachelor's thesis deals with the design of a two-way speaker system and a variable baffle for a subwoofer for the purposes of demonstration measurement in the subject of Electroacoustics. The theoretical part explains the individual speakers, TS parameters and formulas for their calculation. Furthermore, various types and constructions of baffles and audio crossovers. Using the simulation program LspCAD, the designs of closed and bass reflex baffles with right and wrong parameters were fine-tuned and simulated. The proposed crossover for a two-way speaker system was also simulated. Drawing documentation was prepared for the designs. Furthermore, the baffles and crossovers were implemented, and their characteristics were measured. Finally, the existing laboratory tasks were reworked so that students could use the implemented baffles and the chosen design procedure.
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