A noise robust speech recognition system. - Masahiro Hamada; Yumi Takizawa; Takeshi Norimatsu (ICSLP, 1990)

Generation of broadband speech from narrowband speech using piecewise linear mapping. - Yoshihisa Nakatoh; Mineo Tsushima; Takeshi Norimatsu (EUROSPEECH, 1997)

Low bit rate coding for speech and audio using mel linear predictive coding (MLPC) analysis. - Yoshihisa Nakatoh; Takeshi Norimatsu; Ah Heng Low; Hiroshi Matsumoto (ICSLP, 1998)

Scalable audio coder based on quantizer units of MDCT coefficients. - Akio Jin; Takehiro Moriya; Takeshi Norimatsu; Mineo Tsushima; Tomokazu Ishikawa (ICASSP, 1999)