DATASTREAM PACKET ALIGNMENT INDICATOR IN A SYSTEM FOR ASSEMBLING TRANSPORT DATA PACKETS
摘要
In a digital television signal processing system, a special codeword, a Packet Alignment Flag (PAF) (14), is inserted into an MPEG codeword bitstream to signify the presence of a Group of Pictures (GOP). The PAF immediately precedes a Picture Start codeword for an "I" frame, which initiates a GOP. A data packet (12) under construction when a PAF (14) appears is terminated since a GOP is intented to begin a packet boundary. Such termination may result in an abbreviated packet of less than a prescribed number of codewords needed to complete a data packet. The last word of each packet is designated as such to facilitate the subsequent combining of data packets (12) with respective headers (18). An incomplete data packet is filled with null (zeroed bits) words to make up a complete data packet with a prescribed number of words.
申请公布号
WO9515652(A1)
申请公布日期
1995.06.08
申请号
WO1993US11640
申请日期
1993.11.30
申请人
GENERAL ELECTRIC COMPANY;BUNTING, RICHARD, MICHAEL;HARRIS, DAVID, ISAAC;ACAMPORA, ALFONSE, ANTHONY;BROOKS, CHARLES, ALAN
发明人
BUNTING, RICHARD, MICHAEL;HARRIS, DAVID, ISAAC;ACAMPORA, ALFONSE, ANTHONY;BROOKS, CHARLES, ALAN