The design and implementation of data server for data broadcast service

This paper describes the design and implementation of the data server that provides viewers with data broadcast service to enhance the conventional broadcast service with only audio/video. There are asynchronous, synchronous and synchronized data services according to the timing association with main AN program, but only asynchronous data service is now prevailing in DTV environment. The asynchronous data service is too limited to broadcast the interactive data service such as quiz show, advertisement, polling and bidding. The proposed data server had been designed to encode asynchronous, synchronous and synchronized data elements for a variety of data broadcast services.