Patent ID: 7506353

Claim:
A speed change playback apparatus of a digital television, comprising: an MPEG decoder configured to receive and record a stream of traffic; decode the recorded stream of traffic at a position different from a recording position; receive a time shift service request including a lime shift service request time point, as a result of receiving the time shift service request, detect and store location information of an I picture of a transport stream packet (TP packet), the location information corresponding to the time shift service request time point, output a signal notifying a detection of the location information of the I picture corresponding to the time shift service request time point, and output plural TP packets from the time shift service request time point; a first and second storing units; and a time shift software module operatively connected to the MPEG decoder and the first and second storing units, the time shift software module configured to upon receipt of the signal, read the location information stored in the MPEG decoder, store location information of plural I pictures, including the location information of the I picture in the first storing unit in time orders from the time shift service request time point, store plural TP packets corresponding to the plural I pictures from the time shift service request time point in the second storing unit, and when a playback request signal including a playback start position is inputted, extract a set of the plural TP packets from the second storing unit based on the stored location information and the playback start position, interrupt the MPEG decoder, and output the set in an order corresponding to the playback request signal to the MPEG decoder for decoding.