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1. 发明申请

WO1998023093A1 METHOD AND APPARATUS FOR MODIFYING TABLES OF DATA 审中-公开
标题翻译：用于修改数据表的方法和装置
公开(公告)号：WO1998023093A1
公开(公告)日：1998-05-28
申请号：PCT/GB1997003142
申请日：1997-11-14
申请人： NDS LIMITED , CARTWRIGHT, Charles , WILSON, Giles , CAINES, Christopher
发明人： NDS LIMITED
IPC分类号： H04N07/58
CPC分类号： H04N21/4347 , H04N21/2365
摘要： The present invention concerns a method and apparatus for modifying tables of data included in a digital stream of encoded data. The invention is of particular application to modifying the data in tables of data included in the digital transport stream of a digitally compressed television signal. The tables of data are extracted from the stream and the extracted tables are processed to identify data that are to be dropped. A filter is used to filter out the identified data and new local data is entered into the extracted tables to replace dropped data and thereby form modified tables of data. The filtered stream is multiplexed with the modified tables of data to form an output digital stream. By this means, the constantly updated tables in the input stream are modified only in respect of the local changes and the updates are passed through to the output stream.
摘要翻译：本发明涉及用于修改包含在编码数据的数字流中的数据表的方法和装置。本发明特别适用于修改包含在数字压缩电视信号的数字传输流中的数据的表中的数据。从流中提取数据表，并处理提取的表以识别要丢弃的数据。过滤器用于过滤出所识别的数据，并且将新的本地数据输入到提取的表中以替换丢弃的数据，从而形成修改的数据表。经过滤波的流与修改的数据表复用以形成输出数字流。通过这种方式，输入流中不断更新的表仅在本地更改方面进行修改，并将更新传递到输出流。

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