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Design of a spherical microphone array
Voch, Filip ; Schimmel, Jiří (referee) ; Liska, Matej (advisor)
Spherical microphone array is one of the ways to record spatial sound. This paper proposes rigid spherical array for beamforming and mixed order ambisonics using MEMS sensors connected with TDM bus. MEMS sensors are used due to their small size. Digital output signal is transferred to external signal processor using time division multiplexing. This paper describes an approach to design of the array for beamforming using mathematical methods for node layout on a sphere and for ambisonics using spherical harmonic functions. For prototype realization there is created design with uniformly distributed microphones on the sphere. There are flexible printed circuit boards designs for connecting the microphones. Those boards are then connected to central printed circuit board, where are the signals converted to resp. from differential signal for transfer between the array and the signal processor. RJ-45 connectors are being used for this transfer. Microphones are connected to the buses by USB-C connectors. The result is framework solution including 3D model and printed circuit board designs for microphone connection. 3D model is designed in Fusion 360 software and printed circuit boards in KiCad.
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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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Sound Design for 360-Degree Videos
Pilát, Peter ; Oramus, Tomáš (referee) ; Rund, František (advisor)
The main theme of this work is the creation of sound for 360 ° videos. The work discusses the area of spatial sound and focuses mainly on the whole process of creating from recording through mix, master to sharing. Furthermore, the scene is designed, a complete recording and processing is performed, a detailed procedure is described and sample tasks are created for further use.
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Acoustic Signal Pickup and Processing Using B Format Technology
Wiesner, Jakub ; Vlach, Jan (referee) ; Schimmel, Jiří (advisor)
The work is aimed to proposal of system for acoustic signal pickuping, software processing and conversion into signals for surround sound systems. The work describes sound sensation by human auditory organ and associated effects of binaural hearing and multichannel stereo and surround sound systems. Next aim of the work is to describe ambisonics, surround sound and formats for surround sound pickuping, transmission, processing a decoding. An ending part introduces problems of surround sound pickuping by using of SoundField technology and output signals decoding process of this technology into signals of other surround sound systems.
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Recording and Processing of 3D Sound for Sound Design
Šilar, Prokop ; Rund, František (referee) ; Schimmel, Jiří (advisor)
Objective of this thesis is research of available tools for sound production of 3D and 360° video, ambisonic theory elaboration, selection and description of plug-in moduls to be used for teaching ambisonics. These ambisonic-related formats are described: A-format, B-format (FuMa), B-format (AmbiX), C-format and D-format. Loudspeaker configurations for ambisonic recordings playback are also described (loudspeaker configuration according to the ITU-R BS 775-3 recommendation and quadrophonic loudspeaker configuration). Also, these plug-in moduls are described: Sennheiser AMBEO Orbit, SoundField by Rde, Soundfield SurroundZone2, Ambisonic Toolkit for Reaper and Facebook Audio 360 Spatial Workstation. Moreover, there is described ambisonics-related work in Reaper, Cubase and Nuendo DAWs and there are demonstrational projects for work with ambisonics demonstrating basic signal operations and spatial panning of close-miked sound sources in the DAWs and plug-in modules in question. These plug-in modules and their use in DAWs in question are described in purpose of basic foundation of ambisonic-related teaching at this school with the use of instruments just available. Even theory described here can be used as teaching foundation compiling the basics of the problematics in question. Demonstrational projects made for this thesis can be used directly in the laboratory exercises.
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Acoustic Signal Recording and Processing Using B-Format Technology
Kurc, David ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This bachelor’s thesis is focused on the system of recording and processing of acoustics signals called Ambisonics. It describes single sections of this system in the chain of acoustic signal processing. At most it is aimed at the B-format technology as the main ambisonic instrument, its encoding from the signals recorded with the special microphone capsule of the soundfield type or with help of encoding equations and its decoding into single speaker channels of various speaker arrays. The UHJ transmission format is also mentioned. The application B-format Decoder was created in the MATLAB programming environment. It consists of several functions and has friendly user interface, which provides the processing and decoding of B-format components for the speaker array with entered parameters. Among others this interface ensures loading, displaying, analysis and playback of source and resulting acoustic signals.
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Sound panning in multichannel sound systems
Orlovský, Kristián ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
This thesis is aimed at simulation of auditory space. The first part is based on theoretical information and explains two of the most frequently used sound panning methods: Vector Base Amplitude Panning and Ambisonics. It shows the ways for sound panning by these methods. In next step are methods compared based on theoretical information and simulations in Matlab environment and one most suitable method is chosen for using in second part. This part describes image source method which enables parameters computation of direct sound wave and optional number of early reflections in rectangular room. Also is focused on problem of frequency dependent reflections. In conclusion it offer knowledge obtained by simulation of different auditory spaces with different topology.
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Sound Design for 360-Degree Videos
Pilát, Peter ; Oramus, Tomáš (referee) ; Rund, František (advisor)
The main theme of this work is the creation of sound for 360 ° videos. The work discusses the area of spatial sound and focuses mainly on the whole process of creating from recording through mix, master to sharing. Furthermore, the scene is designed, a complete recording and processing is performed, a detailed procedure is described and sample tasks are created for further use.
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Recording and Processing of 3D Sound for Sound Design
Šilar, Prokop ; Rund, František (referee) ; Schimmel, Jiří (advisor)
Objective of this thesis is research of available tools for sound production of 3D and 360° video, ambisonic theory elaboration, selection and description of plug-in moduls to be used for teaching ambisonics. These ambisonic-related formats are described: A-format, B-format (FuMa), B-format (AmbiX), C-format and D-format. Loudspeaker configurations for ambisonic recordings playback are also described (loudspeaker configuration according to the ITU-R BS 775-3 recommendation and quadrophonic loudspeaker configuration). Also, these plug-in moduls are described: Sennheiser AMBEO Orbit, SoundField by Rde, Soundfield SurroundZone2, Ambisonic Toolkit for Reaper and Facebook Audio 360 Spatial Workstation. Moreover, there is described ambisonics-related work in Reaper, Cubase and Nuendo DAWs and there are demonstrational projects for work with ambisonics demonstrating basic signal operations and spatial panning of close-miked sound sources in the DAWs and plug-in modules in question. These plug-in modules and their use in DAWs in question are described in purpose of basic foundation of ambisonic-related teaching at this school with the use of instruments just available. Even theory described here can be used as teaching foundation compiling the basics of the problematics in question. Demonstrational projects made for this thesis can be used directly in the laboratory exercises.
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