DIGITAL TELEVISION SYSTEM SUPPORTING MULTI DECODING AND COMMUNICATING METHOD FOR ITS DECODER CHIPS

摘要

A digital television system and a method for communicating between decoder chips thereof are provided to control the output of OSD(On Screen Display) images of a digital broadcasting decoder chip for decoding an exiting digital broadcasting signal and a multi-decoder chip for decoding a broadcasting signal transmitted through an external input device by defining the types of communication messages between the digital broadcasting decoder chip and the multi-decoder chip. A digital television system includes a digital broadcasting decoding unit(11) for receiving and decoding digital broadcasting, a multi-decoding unit(12) for receiving contents from an external device and decoding the contents, a connecting unit for control message communication between the digital broadcasting decoding unit and the multi-decoding unit, and a display unit(10) for outputting a stream outputted from the digital broadcasting decoding unit or the multi-decoding unit through a screen. The digital broadcasting decoding unit determines a user input code to transmit a command message to the multi-coding unit. The multi-coding unit is operated by the command message, and the multi-coding unit transmits a response message to the digital broadcasting decoding unit.