Systems for virtual acoustic imaging using the binaural principle
Systems for virtual acoustic imaging using the binaural principle
This work concerns binaural control through the use of loudspeakers in systems used for virtual acoustic imaging. Various aspects involved in the process are investigated. An interpolation and extrapolation scheme is described that provides an accurate method for estimating the head related transfer function at arbitrary locations. A number of practical issues are described, discussed and clarified. These include microphone location, the treatment of ear canal responses and transducer responses, and the design of inverse filters.
Features of the "Stereo Dipole", a system with closely spaced control transducers, are discussed. The principles behind such a system and the practical implementation of a system with finite source separation are described and evaluated. Factors contained in the plant that could lesson the performance such as individual differences in head related transfer functions, misalignment of head and control transducers, and reflections in the reproduction space are examined closely.
The system inversion (cross-talk cancellation) is difficult over certain frequency ranges. Furthermore, the process involved gives rise to a number of problems such as a loss of dynamic range. Following a detailed investigation, a number of methods are described that aim to overcome or mitigate the problems associated with virtual acoustic imaging. The "Optimal Source Distribution" introduces the concept of a variable transducer span that enables natural and effective spatial sound reproduction with the minimum manipulation of sound signals. A number of practical solutions such as discretization are suggested for the realization of such optimally distributed transducers. Characteristics of the plant at various elevation positions of the control transducers are also investigated. As a consequence, a position in the frontal plane above the listener's head is found to be an attractive alternative to the conventional horizontal position.
University of Southampton
Takeuchi, Takashi
e465d0fa-c21b-4373-95f7-ebfb5bc5fa07
2001
Takeuchi, Takashi
e465d0fa-c21b-4373-95f7-ebfb5bc5fa07
Takeuchi, Takashi
(2001)
Systems for virtual acoustic imaging using the binaural principle.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This work concerns binaural control through the use of loudspeakers in systems used for virtual acoustic imaging. Various aspects involved in the process are investigated. An interpolation and extrapolation scheme is described that provides an accurate method for estimating the head related transfer function at arbitrary locations. A number of practical issues are described, discussed and clarified. These include microphone location, the treatment of ear canal responses and transducer responses, and the design of inverse filters.
Features of the "Stereo Dipole", a system with closely spaced control transducers, are discussed. The principles behind such a system and the practical implementation of a system with finite source separation are described and evaluated. Factors contained in the plant that could lesson the performance such as individual differences in head related transfer functions, misalignment of head and control transducers, and reflections in the reproduction space are examined closely.
The system inversion (cross-talk cancellation) is difficult over certain frequency ranges. Furthermore, the process involved gives rise to a number of problems such as a loss of dynamic range. Following a detailed investigation, a number of methods are described that aim to overcome or mitigate the problems associated with virtual acoustic imaging. The "Optimal Source Distribution" introduces the concept of a variable transducer span that enables natural and effective spatial sound reproduction with the minimum manipulation of sound signals. A number of practical solutions such as discretization are suggested for the realization of such optimally distributed transducers. Characteristics of the plant at various elevation positions of the control transducers are also investigated. As a consequence, a position in the frontal plane above the listener's head is found to be an attractive alternative to the conventional horizontal position.
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Published date: 2001
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Local EPrints ID: 464726
URI: http://eprints.soton.ac.uk/id/eprint/464726
PURE UUID: 8a7acd4c-21a9-4fd8-9795-cf135ec34cd8
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Date deposited: 04 Jul 2022 23:58
Last modified: 16 Mar 2024 19:43
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Author:
Takashi Takeuchi
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