○Yasuaki Kakehi¹, ○Tetsuaki Baba², ○Hidenori Watanabe², ○Shoichi Hasegawa³, ○Junji Watanabe⁴, Daisuke Iwai⁵, ○Tatsuya Honda⁶ (1.Keio University , 2.Tokyo Metropolitan University, 3.Tokyo Institute of Technology, 4.NTT Communication Science Laboratories, 5.Osaka University, 6.Fujitsu)