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May 2011

Correlation Matrix Interpolation in Sound Source Localization for a Robot

  • K. Nakamura, K. Nakadai, H. Nakajima, G. Ince,
  • in Proceedings of the 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2011),
  • IEEE,
  • 2011,
  • pp. 4324-4327,
  • Conference paper

In microphone array processing, a Correlation Matrix (CM) between multiple channel input signals is widely utilized for various purposes such as Sound Source Localization (SSL), etc. The CM corresponds to spatial information between a microphone and a sound source, and it dynamically changes as they move in a dynamic environment. Since pre-measured CMs have difficulties in dealing with dynamically changing environments due to their discreteness, this paper addresses a CM interpolation utilizing a few discrete known CMs. The proposed method is based on an integration of eigen-value-scaling and linear interpolation, which requires a few measurements and low computational costs. Apart from conventional methods, this paper deals with an interpolation based on a correlation-matrix not based on a transfer-function, which achieves the integration approach. The evaluation shows better estimation performance compared to conventional transfer-function-based methods. We also applied the interpolation to SSL and confirmed its validity.

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