1세그먼트 is a mobile terrestrial digital audio/video and data broadcasting service in Japan, 아르헨티나, 브라질, 칠레, 우루과이, 파라과이, 페루, and the Philippines.

1 seg is designed as a component of ISDB-T, the terrestrial digital broadcast system used in those countries, as each channel is divided into 13 세그먼트, with a further segment separating it from the next channel; an HDTV broadcast signal occupies 12 세그먼트, leaving the remaining (13일) segment for mobile receivers, 그러므로 이름, “1세그먼트” 또는 “원세그”. See full seg.