Shinichi Sakamoto, Kimihiro Sakagami and Toshiki Hanyu Institute of Industrial Science, the University of Tokyo, Komaba, Meguro-ku, Tokyo, 153–8505 Japan Environmental Acoustics Laboratory, Department of Architecture and Civil Engineering, Faculty of Engineering, Kobe University, Rokko, Nada, Kobe, 657–8501 Japan Department of Construction, Junior College, Nihon University, Funabashi, Chiba 274–8501
