System and process for time delay estimation in the presence...

Details System and process for time delay estimation in the presence... System and process for time delay estimation in the presence...

2006-09-26

2006-09-26

Grier, Laura A. (Department: 2615)

Electrical audio signal processing systems and devices

Directive circuits for microphones

C381S094100, C381S071200

Reexamination Certificate

active

07113605

ABSTRACT:
A system and process for estimating the time delay of arrival (TDOA) between a pair of audio sensors of a microphone array is presented. Generally, a generalized cross-correlation (GCC) technique is employed. However, this technique is improved to include provisions for both reducing the influence (including interference) from correlated ambient noise and reverberation noise in the sensor signals prior to computing the TDOA estimate. Two unique correlated ambient noise reduction procedures are also proposed. One involves the application of Wiener filtering, and the other a combination of Wiener filtering with a Gnnsubtraction technique. In addition, two unique reverberation noise reduction procedures are proposed. Both involve applying a weighting factor to the signals prior to computing the TDOA which combines the effects of a traditional maximum likelihood (TML) weighting function and a phase transformation (PHAT) weighting function.

REFERENCES:
patent: 5602962 (1997-02-01), Kellermann
patent: 5610991 (1997-03-01), Janse
patent: 5835607 (1998-11-01), Martin et al.
Brandstein, Michael S., Time-delay Estimation of Reverberated Speech Exploiting Harmonic Structure, May 1999, J. Acoustical Society of America 105(5) pp. 2914-2919.

Affiliated with

Also associated with

Rating

System and process for time delay estimation in the presence... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System and process for time delay estimation in the presence..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and process for time delay estimation in the presence... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3573535