Multiple Moving Talker Tracking by Integration of Two Successive Algorithms

In this paper, an estimation accuracy of multiple moving talker tracking using a microphone array is improved. The tracking can be achieved by the adaptive method in which two algorithms are integrated, namely, the PAST (Projection Approximation Subspace Tracking) algorithm and the IPLS (Interior Point Least Square) algorithm. When either talker begins to speak again after a silent period, an appropriate feasible region for an evaluation function of the IPLS algorithm might not be set. Then, the tracking fails due to the incorrect updating. Therefore, if an increment of the number of active talkers is detected, the feasible region must be reset. Then, a low cost realization is required for the high speed tracking and a high accuracy realization is desired for the precise tracking. In this paper, the directions roughly estimated using the delayed-sum-array method are used for the resetting. Several results of experiments performed in an actual room environment show the effectiveness of the proposed method.

Authors:

• Kenji Suyama
• Masahiro Oshida
• Noboru Owada

Keywords:

• moving talkers tracking
• microphone array
• signal subspace

References:

[1] M. Brandstein and D. Ward, "Microphone arrays signal processing
techniques and applications," Springer, 2001.
[2] M. Fallon and S. Godsill, "Multi target acoustic source tracking using track before detect" in Proc. IEEE WASPAA, pp. 102-105, 2007.
[3] D. Tsuji and K. Suyama, "A moving sound source tracking based on two
successive algorithms," in Proc. IEEE ISCAS, C2L-E5-5, 2009.
[4] R. O. Schmidt, "Multiple emitter location and signal parameter estimation"
IEEE Trans. IEEE AP., vol. 34, no. 3, pp. 276-280, 1986.
[5] B. Yang, "Projection approximation subspace tracking," IEEE Trans. SP.,
vol. 43, no. 1, pp. 95-107, 1995.
[6] K. H. Afkhamie, Z. Luo, and K. M. Wong, "Adaptive linear filtering using interior point optimization techniques," IEEE Trans. SP., vol. 48, no. 6, 2000.
[7] N. Ohwada and K. Suyama, "Multiple sound source tracking method
based on subspace tracking," in Proc. IEEE WASPAA2009, pp.217-220,2009