Directivity characteristics of adaptive microphone-array for noise reduction (AMNOR)

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概要

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• AMNOR is a new type of noise-reduction microphone system which uses a microphonearray and digital signal processing. In this paper, the theory of AMNOR is described in the frequency domain, and its directivity characteristics are studied. Then, iti is shown that, under some simple noise conditions, AMNOR forms the same directivity patterns at those formed by conventional directional microphones. In contrast to the directivity characteristics of conventional directional microphones which are assumed to be optimal for some restricted noise environments, AMNOR can realize the optimal directivity characteristics adaptively for a wide variety of existing noise environments. This is accomplished in AMNOR by the following three functions; (1) AMNOR forms M-1(where M is the number of microphone elements) dead angles with respect to the noise arrival directions, (2) AMNOR optimizes the directivity lobe figure (3) AMNOR performs directivity control of (1) and (2) for each frequency band independently.

• 社団法人日本音響学会の論文

著者

• Kaneda Yutaka

  Ntt Cyber Space Laboratories:(present Address) Acoustics Signal Processing At The Department Of Info

• Kaneda Yutaka

  Ntt Human Interface Laboratories

• Kaneda Y

  Tokyo Denki Univ. Tokyo Jpn

関連論文

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• Directivity characteristics of adaptive microphone-array for noise reduction (AMNOR)
• Two-Channel Blind Deconvolution of Nonminimum Phase FIR Systems

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