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Time delay estimation and signal reconstruction using multi-rate measurements

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2 Author(s)
Jahromi, O. ; Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada ; Aarabi, P.

This paper considers the problem of fusing two low-rate sensors (e.g., microphones) for reconstructing one high-resolution signal when time delay of arrival (TDOA) is present as well. We show that under certain conditions the phase of the cross-spectrum-density of low-rate measurements becomes independent of the signal in the high-rate front end of the system. We then utilize this fact to demonstrate that it is possible to extend a class of TDOA estimation techniques known as the generalized cross correlation technique to linear-phase multi-rate sensor systems. Finally, we illustrate how the combination of the theory of linear-phase multirate filter banks and TDOA estimation can result in a practical, multi-sensor signal reconstruction system.

Published in:

Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on  (Volume:6 )

Date of Conference:

6-10 April 2003