Patent ID: 7577982
Filing Date: 2009-08-18
Classification: H04H,H04L

Abstract:
1. An apparatus for changing a channel in a digital broadcasting system, comprising: a digital broadcast server for transmitting a multiplexed stream, obtained by multiplexing at least one down broadcast data obtained by downsizing at least one broadcast data to an IP (Internet protocol) network over a set channel, and transmitting up broadcast data obtained by upsizing the down broadcast data and at least one difference broadcast data obtained by differentiating the broadcast data, to the IP network over respective set channels; and a set-top box for accessing a channel over which the multiplexed stream is transmitted to perceive a down broadcasting PID set for transmitting at least one down broadcast data contained in the multiplexed stream, upsizing and outputting down broadcast data having a down broadcasting PID corresponding to selected channel information from the multiplexed stream when a user selects a certain channel, summing difference broadcast data corresponding to a difference broadcasting PID obtained from streams received over the selected channel using the down broadcasting PID corresponding to the channel information and broadcast data obtained by upsizing the down broadcast data corresponding to the down broadcasting PID corresponding to the channel information, and outputting the result for display on a digital television.