Method and Apparatus for Speech Analysis and  Synthesis (with C. I. Byrnes), United States Patent  5,940,791,  August 17, 1999.

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

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