A digital hearing aid that compensates loudness for sensorineural impaired listeners. - Futoshi Asano; Y. Suzuki; Toshio Sone; S. Kakehata; M. Satake; Koichi Ohyama; T. Kobayashi; T. Takasaka (ICASSP, 1991)

An all-ASIC implementation of a low bit-rate video codec. - Hiroshi Fujiwara; Ming L. Liou; Ming-Ting Sun; Kun-Min Yang; Masanori Maruyama; Kazuyoshi Shomura; Koichi Ohyama (IEEE Trans. Circuits Syst. Video Technol., 1992)

Estimation of aliasing error in layered coding system. - Masahiro Iwahashi; Koichi Ohyama; Noriyoshi Kambayashi (ICASSP (5), 1994)

Design of Motion Compensation Filters for Frequency Scalable Coding - Drift Reduction. - Masahiro Iwahashi; Koichi Ohyama; Wataru Kameyama; Noriyoshi Kambayashi (ISCAS, 1994)