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Method and Apparatus for Speaker Recognition (with C. I. Byrnes), United States Patent  6,256,609, July 3, 2001.

A Tunable High-Resolution Spectral Estimator (with C. I. Byrnes and T. T. Georgiou), United States Patent 6,400,310, June 4, 2002.

Method and Apparatus for Speaker Verification Using a Tunable High-resolution Spectral Estimator (with C. I. Byrnes and T. T. Georgiou), United States Patent  No. 7,233,898,  June 19, 2007.