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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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Integrated multichannel audio amplifier for home cinema
Fišer, Ondřej ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
This paper describes complete design of amplifier for home cinema system. Described amplifier has 2 digital inputs (TOSLINK and S/PDIF) and single analog input. With this inputs it is possible to connect amplifier to a source of surround audio 5+1 signal. Paper further discuss design of correction circuits, preamplifier, power amplifier and power source. The whole is controlled by 8-bit microprocessor and has a graphics output implemented through LCD display. The goal of this paper is to design and build high quality amplifier.
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Design and Realization of Loudspeker System for Wavefield Synthesis
Naňák, Pavel ; Koton, Jaroslav (referee) ; Schimmel, Jiří (advisor)
The thesis deal with the design and construction of single cluster of apparatus which can serve as a signal source for wavefield synthesis. Apparatus can be controlled remotely by Ethernet interface. Thesis contains theoretical analyses of speaker system, class D amplifier, digital to analog conversion, digital format of acoustic data ADAT and Ethernet interface. Conceptual design of cluster and description of constructed module is concerned.
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Loudspeaker Box for Wavefield Synthesis
Naňák, Pavel ; Kubánek, David (referee) ; Schimmel, Jiří (advisor)
Purpose of this work is to design active loudspeaker system as a source of sound proper for wavefield synthesis. Loudspeaker system is considerate as a singleband and its length should not overlap 15cm. System should be designed at the best in parameters like frequency characteristic and directional characteristic. Part of work is dedicated to theoretical aspects, explanation of wavefield principles itself and its usage on the field of surround sound, further this work concerns aural transducers, especially electrodynamic one, which is used in this work, and the last topic is about baffle-board for loudspeakers. Hereinafter there are laid two proposals of baffles, one conception is closed baffle and second is bassreflex baffle. Both of those baffle conception are simulated in program LEAP-5 and are optimized for this current work. All construction possibilities introduced in this work are digestedly documented in appendix. Special attention is dedicated to right choice of aural transducer for this loudspeaker and to description of its attributes, there are discussed pro and cons of every chosen transducer and its suitability for this work. Electronic part of work is designing of amplifier and power source suitable for at least four of loudspeakers. Amplifier is modified for switching input level of signal between -10 dBu and +4 dBu, this range is reached by switching the amplification of amplifier. Amplifier is realized in class D, because of the demands on small the size of the system. Amplifier is powered by external source designated to be small and effective at the same time. Each module of power source and amplifier has their schemes and designs of printed circuit boards are documented in appendix.
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Surround amplifier and processor for home audio listening
Šenfluk, Petr ; Brančík, Lubomír (referee) ; Kratochvíl, Tomáš (advisor)
The aim of bachelor’s thesis is design of an effect amplifier and processor for home audio listening. It includes three-channel class-D audio power amplifier supplemented with analog and digital input stages processing analog stereo signal. These input stages have a function of pre-amplifier, automatic volume control, analog filters and digital delay line, which make it usable generally in three elective modes. These elective modes are stereo reproduction, stereo reproduction supplemented with subbass channel and additional reproduction creating surround effect.
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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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Wavefield Synthesis for Linear Loudspeaker Array
Panáček, Richard ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This master thesis is meant to create a function for processing audio signals with Wavefield Synthesis for linear loudspeaker array. The text focuses on general issues of Wave Field Synthesis and practical design of 2.5D synthesis. It introduces Huygens’ principle followed by Rayleigh’s Theorem together with Rayleigh’s integrals. True design realizations are introduced based on theoretical procedures. The text states advantages and disadvantages of Wave Field Synthesis with linear loudspeaker array and also recounts solutions of some of the problems. The practical part of this thesis is devoted to designing two functions of Wave Field Synthesis inside the programming platform Matlab. The first function serves for processing signals from audio recordings and the second one for processing signals in real time. Proper functioning of procedures used in this thesis is then tested by a listening test.
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Other places
Jáchim, Jan ; Skála, Jiří (referee) ; Klímová, Barbora (advisor)
Walk through a fictional dreamed space. Audiovisual installation combines surround sound and parallel text commentary. Using the imagination of sound illusion, projected text and absence of image, it aims to motivate the spactator's dreaming.
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Experimental granular software with spatial setting
Pospíšil, Tomáš ; Dlouhý, Dan (referee) ; Indrák, Michal (advisor)
This thesis deals with a design and realization of the experimental software, which has the task to distribute the granular synthesis into surround sound, specifically into the octofonic sound system. The software is designed as a VST3 plugin, which was created in a JUCE framework. Apart of problematics mentioned above the thesis also contains theoretical and technical knowledge linked with granular synthesis, surround sound and a form of realization of a resulting software. The end of this thesis is dedicated to the testing phase and deficits of resulting software.
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