Speech recognition with rapid environment adaptation by spectrum equalization. - Keizaburo Takagi; Hiroaki Hattori; Takao Watanabe (ICSLP, 1994)

Speech recognition using tree-structured probability density function. - Takao Watanabe; Koichi Shinoda; Keizaburo Takagi; Eiko Yamada (ICSLP, 1994)

Rapid environment adaptation for robust speech recognition. - Keizaburo Takagi; Hiroaki Hattori; Takao Watanabe (ICASSP, 1995)

High speed speech recognition using tree-structured probability density function. - Takao Watanabe; Koichi Shinoda; Keizaburo Takagi; Ken-ichi Iso (ICASSP, 1995)

Unsupervised and incremental speaker adaptation under adverse environmental conditions. - Keizaburo Takagi; Koichi Shinoda; Hiroaki Hattori; Takao Watanabe (ICSLP, 1996)