PROGRAM SPECIFIC INFORMATION FORMATION FOR DIGITAL DATA PROCESSING

摘要

PROGRAM SPECIFIC INFORMATION (PSI) IS FORMED (115) SUITABLE FOR USE IN RECOVERING DATA CONTENT OF A PROGRAM IN THE FORM OF A PACKETIZED DATASTREAM. PACKET IDENTIFIERS (PIDS) THAT IDENTIFY INDIVIDUAL PACKETIZED DATASTREAMS CONSTITUTING THE PROGRAM ARE RENUMBERED AND CORRESPONDING PACKETIZED DATASTREAMS THAT CONSTITUTE DIFFERENT PROGRAMS ARE GIVEN THE SAME PID (115). A PROGRAM MAP TABLE (PMT) IS CREATED THAT (115) ASSOCIATES THE RENUMBERED PIDS WITH THE INDIVIDUAL PACKETIZED DATASTREAMS CONSTITUTING THE PROGRAM. A PROGRAM ASSOCIATION TABLE (PAT) IS ALSO CREATED (115) FOR ASSOCIATING THE PROGRAM WITH PIDS THAT IDENTIFY PACKETS COMPRISING THE PMT. A PARAMETER MAY BE EMPLOYED WITHIN THE PSI TO INDICATE THAT THE PSI IS TO BE APPLIED IN SUBSEQUENT PROCESSING OF THE PROGRAM IRRESPECTIVE OF A SUBSTANTIVE DIFFERENCE BETWEEN THE PSI AND PREVIOUS PSI CONTENT. IN ADDITION, THE PSI MAY INCORPORATE A VERSION NUMBER THAT IS VARIED BETWEEN SUCCESSIVE OCCURRENCES OF THE PSI IRRESPECTIVE OF SUBSTANTIVE CHANGE IN PSI CONTENT. ONE OR MORE PRIVATE DATA I ELEMENTS MAY ALSO BE INCLUDED IN THE PMT TO DESCRIBE THE PROGRAM. (FIG 1)