This document discusses the transition from analog to digital television around the world and in the Philippines specifically. It outlines the different digital TV systems like ATSC, DVB-T, DTMB, and ISDB-T which Japan and most of South America use. The Philippines announced in 2010 it would change from NTSC analog to ISDB-T digital by 2015, later extended to 2020. It describes stations testing digital broadcasts and features of decoder boxes needed to receive the digital over-the-air signal, comparing models from MBB and Mangotech.