Digital DPCM Codec for TV Signals Based on Delta M/DPCM Digital Conversions. - Tatsuo Ishiguro; Toshio Oshima; Hisashi Kaneko (IEEE Trans. Commun., 1974)

Reduction of Edge Busyness in Delta Modulation. - Toshio Oshima; Tatsuo Ishiguro (IEEE Trans. Commun., 1975)