Patent ID: 7586986

Claim:
A system decoder of a digital TV, comprising: a buffer unit simultaneously receiving packet data input from a plurality of channels, giving a channel identifier (ID) to each channel, and temporally storing, time-sharing and outputting the packet data; a packet identifier (PID) processing unit consisting of one PID filter shared by a plurality of channels and a PID filter memory, and if there is an extension PID field in the PID filter memory matching with the extension PID field of a packet output from the buffer unit, processing the input packet as defined for the values of the rest of the fields set for a corresponding address; and a section processing unit consisting of one section filter shared by a plurality of channels and a section filter memory, and if a packet output from the PID processing unit and in processing contains a section, determining whether to take the input packet or not by comparing an extension table ID field set for the section filter memory and an extension table ID of the packet in processing.