[1] Applied Physics Laboratory, University of Washington, 1013 NE 40 St., Seattle, WA 98105, United States
[2] University of Michigan, Ann Arbor, MI, United States
[3] University of Washington, Seattle, WA, United States
[4] Signal Processing Division, Analytic Sciences Corporation, Reston, VA, United States
[5] Speech Resaearch Dept., AT and T Bell Laboratories, Murray Hill, NJ, United States
[6] MathSoft, Seattle, WA, United States
[7] Applied Physics Laboratory, University of Washington, Seattle, WA, United States