The Integrated Services Digital Broadcasting (ISDB) (Japanese: 統合デジタル放送サービス, Tōgō dejitaru hōsō sābisu) is a Japanese standard for digital television (DTV) and digital radio used by the country's radio and television networks. ISDB replaced the previously used MUSE Hi-vision analogue HDTV system. Digital Terrestrial Television Broadcasting (DTTB) services using ISDB-T started in Japan in December 2003 and in Brazil in December 2007 as a trial. Since many countries have adopted ISDB over other digital broadcasting standards.