|(11)||EP 2 809 075 A3|
|(12)||EUROPEAN PATENT APPLICATION|
|(54)||Method and apparatus of channel switching using pre-acquisited PSI tables|
|(57) The present invention provides a method (S410-S450) and an apparatus (360) for switching channels to reduce channel zapping time, which use channel information (PSI) obtained prior to channel switching (S420) to generate (i.e., extract from a transport stream) audio and video data of a switched channel, thereby skipping the process of calculating channel information of a channel to be switched at the time of channel switching (S450). Channel information can be obtained for example by using an "idling" tuner amon a plurality of tuners (320), by using an IP network (305), or by transporting program association tables (PAT) respectively program map tables (PMT) for a plurality of transport streams over a single transport stream in order that the receiver obtains channel information for plural transport streams without receiving all of them.