1. Yi Yuan, Nick S. Kapsokavathis, Ke Chen, and Sen M. Kuo, “Active Noise Control System,” US Patent No. 5,359,662, Oct. 25, 1994.

2. Sen M. Kuo, Minjiang Ji, M. Kathryn Christensen, and Robert A. Herold, “Indirectly Sensed Signal Processing in Active Periodic Acoustic Noise Cancellation,” US Patent No. 5,502,770, Mar. 26, 1996.

3. Sen M. Kuo, “Active Noise Control System and Method for On-Line Feedback Path Modeling and On-Line Secondary Path Modeling,” US Patent No. 5,940,519, August 17, 1999.

4. Sen M. Kuo, “Off-line Feedback Path Modeling Circuitry and Method for Off-line Feedback Path Modeling and Off-line Secondary Path Modeling,” US Patent No. 5,991,418, Nov. 1999.

5. Sen M. Kuo, “Digital Hearing Aid and Method for Feedback Path Modeling,” US Patent No. 6,097,823, August 2000.

6. Sen M. Kuo, “Off-line Feedback Path Modeling Circuitry and Method for Off-line Feedback Path Modeling,” US Patent No. 6,198,828, March 6, 2001.

7. Sen M. Kuo, “Active Noise Control System and Method for On-Line Feedback Path Modeling,” US Patents No. 6,418,227, July 9, 2002.