1. a Panasonic Technologies, Inc. , 5055 Mark Dabling Boulevard, Colorado Springs, CO, 80918, USA
2. b Electronics Research Laboratory , Matsushita Electronics Corporation , 1-1 Saiwai-cho, Takatsuki, Osaka, 569-1193, JAPAN
3. c Department of Electrical and Computer Engineering , University of Colorado , 1420 Austin Bluffs Parkway, Colorado Springs, CO, 80933-7150, USA
4. d Symetrix Corporation , 5055 Mark Dabling Boulevard, Colorado Springs, CO, 80918-3862, USA