Establishment of a sound field reproduction method with high flexibility
| Project/Area Number |
17560336
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Communication/Network engineering
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| Research Institution | University of Yamanashi |
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Principal Investigator |
OZAWA Kenji University of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Associate Professor, 大学院医学工学総合研究部, 助教授 (30204192)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Three dimensional information / Acoustical transfer function / Binaural recoding / reproduction / ARMA model / Individual compensation / DSP starter kit / word intelligibility / dummy head |
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| Research Abstract |
Recording and reproduction of a three-dimensional sound field with high flexibility is important for high-performance collaboration in a tele-collaboration system. The purpose of this research is to establish a sound field reproduction method that compensates for individuality of binaural signals, which are recorded with two microphones embedded in the two ears of a dummy head (acoustical mannequin) and reproduced via headphones.
Two kinds of sound fields were addressed in the term of this research project : One was a dead field intended in FY 2005 and the other was a reverberant field intended in FY 2006. Reverberation of a room is observed as peaks and dips in an acoustic transfer function measured in the room. When the ARMA (Auto-Regressive Moving-Average) model is applied to the transfer function, reverberation can be controlled by controlling the numbers and locations of poles and zeros in the z-plane. In FY 2005, a compensation function proposed in this research was obtained by smoothing the transfer functions with reduced numbers of poles and zeros. In FY 2006, a compensation function for a reverberant room was obtained by adding peaks and dips which were derived by using the ARMA model. The effects of these compensation functions were evaluated by psychoacoustical experiments. Experimental results show that the proposed compensation functions are effective for sound quality as well as sound localization if the numbers of poles and zeros are adequate.
Besides the above mentioned research, the following two research items were undertaken :
1. It was shown that controlling sound field information in a tele-collaboration system brings high word intelligibility irrespective of talking face images.
2. A two-channel measurement system of HpTFs (Headphone-to-ear-canal Transfer Functions) was constructed using a DSP (Digital Signal Processor) starter kit.
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Report
(3 results)
Research Products
(24 results)
