Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Room Acoustics"”.
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Room acoustics : an investigation into the computer simulation of room acoustics, with special reference to Jameson Hall
… first deals with the theory and measurement of room acoustics while the second examines the room acoustic prediction methods.
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A room acoustics measurement system using non-invasive microphone arrays
This thesis summarises research into adaptive room correction for small rooms and pre-recorded material, for example music of films. A measurement system to predict the sound at a remote location within a room, without a microphone at that location was investigated. This would allow the sound …
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The development of a computer program using a modified room acoustics approach to determine sound levels in regular rooms
… sound pressure levels at an array of points in a room. Necessary inputs are the room dimensions, sound power or sound pressure levels for the sources, absorption coefficients for the room surfaces, the temperature, relative humidity, and if sound pressure levels are given for the source a …
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A hybrid method for impulse response measurements with synthesized musical tones and Masked-MLS Stimuli
… point-to-point propagation of sound in room acoustics or input-output relationships of linear systems in electroacoustics. Measurements of impulse responses or transfer functions are routinely carried out first to determine critical room acoustics parameters of enclosures such as concert …
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Untersuchungen zur räumlichen und gehörbezogenen Analyse von Schallfeldern in Sälen
… in the development of many every day products. Room acoustics deals with the perception of sound fields in enclosures and how they could be influenced. First investigations for a directed layout of those sound fields have been made in the beginning of the last century. First methodically studies …
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Efficient modeling of sound source radiation in free-space and room environments
<p>Motivated by the need to develop efficient acoustics simulations for sources in different room environments, a modeling procedure has been proposed that consists of two steps in general: (1) the modeling of the free-space radiation of the source based on measurements in a anechoic environment, …
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Modelling the perception of percussive low frequency instruments in rooms
Throughout the study of room acoustics, adverse effects and methods of controllingand mitigating modal behaviour are a well researched topic. However, despite this, agap between objective metrics and subjective results is still prevalent, thus resultingin a limited understanding of perceived bass …
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Statistical response predictions in complex systems with dissipation
… in statistical energy analysis and statistical room acoustics. Both the statistical distribution of modal decay rates and the effect of dissipation on the intermodal correlations of natural frequency spectra are explored. It is found that for moderate damping the modal decay rates of complex …
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Physically based real-time auralization of interactive virtual environments
… inside enclosures where methods of Geometrical Acoustics are mostly applied for a high-quality synthesis of aural stimuli that go along with a certain realistic behavior. Here, best results are achieved by combining deterministic methods for the computation of early specular sound reflections …
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Extracting room acoustic parameters from received speech signals using artificial neural networks
Quantitative room acoustics over a century has accumulated a knowledge base centred around objective acoustic parameters. Realistic and accurate measurements are essential in room acoustics. Occupied measurements are difficult to undertake with current technology, yet it is well established that …
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Changes of voice production in artificial acoustic environments
… The current study examined the effects of room acoustics in an artificial setting on voice production in terms of sound pressure level and the relationship with the perceived voice comfort and voice control. Three independent room acoustic parameters were considered: gain (alteration of the …
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An Acoustical Analysis of Domes Coupled to Rooms, with Special Application to the Darussholah Mosque, in East Java, Indonesia
… considered to be detrimental or precarious in room acoustics, especially because of the impact they have on the distribution of sound energy. However, it is often difficult to avoid such surfaces in buildings with specific architectural functions. A primary example of this involves mosques, …
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Finite-Elemente-Methoden, Lösungsalgorithmen und Werkzeuge für die akustische Simulationstechnik
… in two practical application examples from room and building acoustics. The simulation of the low-frequency room acoustics of a recording studio, compared with actual measurement results from the studio, demonstrates the opportunities for numerical acoustics simulations in very complex …
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Blind Estimation of Perceptual Quality for Modern Speech Communications
… separable, is used for blind characterization of room acoustics. In particular, estimators of reverberation time, direct-to-reverberation energy ratio, and reverberant speech quality are developed. Lastly, perceptual quality estimation for text-to-speech systems is addressed. Text- and …
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An Energy Diffusion Model for Interior Acoustics with Structural Coupling Using the Laplace Transform Boundary Element Solution
… the design of concert halls, auditoriums, classrooms, and factories. At low frequencies, interior acoustics are analyzed with the wave equation, but significant computational expense imposes an upper frequency limit. Thus, energy methods are often sought for high frequency analysis. However, …
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Binaural technology for virtual reality
… the sound distribution in the virtual scene (room acoustics), the perception-related consideration of all sound field components, as well as the exact reproduction of the artificial sound at the ears of the user. Therefore, the focus of the thesis is also put on the reproduction technology. In …
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Raumakustik - Interaktion visueller und auditiver Wahrnehmungen
… size, colours, lighting and etc. In addition the acoustics can supplement this determination especially at use some types of the spaces, in which speech or music is of interest (e.g. classrooms, lecture rooms, cinema halls, theatre, concert halls, churches and etc.). The aim of the work is to …
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Digitale Signalverarbeitung für Lautsprecher
… at least if directivity and the influence of room acoustics are not considered. Efficient protection against overloading is an indispensable task in the area of large-scale sound reinforcement and also very useful in home hi-fi applications to avoid permanent damage to loudspeakers. The …
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Beugungssimulation ohne Rechenzeitexplosion: Die Methode der quantisierten Pyramidenstrahlen : ein neues Berechnungsverfahren für Raumakustik und Lärmimmissionsprognose ; Vergleiche, Ansätze, Lösungen
In room acoustics and noise immission prognosis, basically three algorithms for the computation of sound fields are in use. These are, in the order of reflection where they are efficient: the mirror image source method ray tracing methods (ray or beam tracing), among these tracing and recursive …
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