An Improved Method for Digital SSB-FDM Modulation and Demodulation. - Rikio Maruta; Atsushi Tomozawa (IEEE Trans. Commun., 1978)

120-Channel Transmultiplexer Design and Performance. - Tomonori Aoyama; Fumio Mano; Kiyohisa Wakabayashi; Rikio Maruta; Atsushi Tomozawa (IEEE Trans. Commun., 1980)

Design and Performance of a DSI Terminal for Domestic Applications. - Rikio Maruta; Atsushi Tomozawa; Takao Nishitani; Tomonori Okada; Ken'Ichi Nakano; Takashi Araseki; Mutsunari Tajima (IEEE Trans. Commun., 1981)

A Discretely Adaptive Delta Modulation Codec. - Kunihiko Niwa; Akira Yukawa; Atsushi Tomozawa (IEEE Trans. Commun., 1981)

A New Channel Bank with Block Companding. - Kunihiko Niwa; Takashi Araseki; Atsushi Tomozawa (IEEE Trans. Commun., 1982)