IEICE TRANSACTIONS on Fundamentals
Sharp Directivity Function Based on Fourier Series Expansion and Its Directional System Realization with Small Number of Microphones
Summary :
In order that speech recognition system may have a high recognition rate in a noisy environment, a wide-band sharp directional microphone system is required at the input for securing a high S/N ratio. The authors have already reported the realization of a wide-band uni-directional microphone system by three-microphone integration method. In this paper, we intend to describe the derivation of a sharp directivity function and the realization of its microphone system. First, setting the shape of the characteristic function to bring a sharp directional pattern and then expanding it into the Fourier series, we derive a new directivity function. Next, on the basis of this directivity function, we will present a sharp directional microphone system with only three non-directional microphones and the subsequent analog signal processing. And also, the directional pattern acquired by the proposed method and the effect of the dispersion in the sensitivity of the constituent microphones on the directivity are discussed in detail.
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- IEICE TRANSACTIONS on Fundamentals Vol.E84-A No.4 pp.975-983
- Publication Date
- 2001/04/01
- Publicized
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- Type of Manuscript
- Special Section PAPER (Special Section on Acoustic Signal Processing)
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Masataka NAKAMURA, Toshitaka YAMATO, Katsuhito KOUNO, Atsuyuki TAKASHIMA, "Sharp Directivity Function Based on Fourier Series Expansion and Its Directional System Realization with Small Number of Microphones" in IEICE TRANSACTIONS on Fundamentals,
vol. E84-A, no. 4, pp. 975-983, April 2001, doi: .
Abstract: In order that speech recognition system may have a high recognition rate in a noisy environment, a wide-band sharp directional microphone system is required at the input for securing a high S/N ratio. The authors have already reported the realization of a wide-band uni-directional microphone system by three-microphone integration method. In this paper, we intend to describe the derivation of a sharp directivity function and the realization of its microphone system. First, setting the shape of the characteristic function to bring a sharp directional pattern and then expanding it into the Fourier series, we derive a new directivity function. Next, on the basis of this directivity function, we will present a sharp directional microphone system with only three non-directional microphones and the subsequent analog signal processing. And also, the directional pattern acquired by the proposed method and the effect of the dispersion in the sensitivity of the constituent microphones on the directivity are discussed in detail.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e84-a_4_975/_p
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@ARTICLE{e84-a_4_975,
author={Masataka NAKAMURA, Toshitaka YAMATO, Katsuhito KOUNO, Atsuyuki TAKASHIMA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Sharp Directivity Function Based on Fourier Series Expansion and Its Directional System Realization with Small Number of Microphones},
year={2001},
volume={E84-A},
number={4},
pages={975-983},
abstract={In order that speech recognition system may have a high recognition rate in a noisy environment, a wide-band sharp directional microphone system is required at the input for securing a high S/N ratio. The authors have already reported the realization of a wide-band uni-directional microphone system by three-microphone integration method. In this paper, we intend to describe the derivation of a sharp directivity function and the realization of its microphone system. First, setting the shape of the characteristic function to bring a sharp directional pattern and then expanding it into the Fourier series, we derive a new directivity function. Next, on the basis of this directivity function, we will present a sharp directional microphone system with only three non-directional microphones and the subsequent analog signal processing. And also, the directional pattern acquired by the proposed method and the effect of the dispersion in the sensitivity of the constituent microphones on the directivity are discussed in detail.},
keywords={},
doi={},
ISSN={},
month={April},}
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TY - JOUR
TI - Sharp Directivity Function Based on Fourier Series Expansion and Its Directional System Realization with Small Number of Microphones
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 975
EP - 983
AU - Masataka NAKAMURA
AU - Toshitaka YAMATO
AU - Katsuhito KOUNO
AU - Atsuyuki TAKASHIMA
PY - 2001
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E84-A
IS - 4
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - April 2001
AB - In order that speech recognition system may have a high recognition rate in a noisy environment, a wide-band sharp directional microphone system is required at the input for securing a high S/N ratio. The authors have already reported the realization of a wide-band uni-directional microphone system by three-microphone integration method. In this paper, we intend to describe the derivation of a sharp directivity function and the realization of its microphone system. First, setting the shape of the characteristic function to bring a sharp directional pattern and then expanding it into the Fourier series, we derive a new directivity function. Next, on the basis of this directivity function, we will present a sharp directional microphone system with only three non-directional microphones and the subsequent analog signal processing. And also, the directional pattern acquired by the proposed method and the effect of the dispersion in the sensitivity of the constituent microphones on the directivity are discussed in detail.
ER -
English
