发明公开
EP0948214A3 Method and apparatus for detecting a start code in a bitstream
审中-公开
对于在比特流中检测到起始码的方法和装置
- 专利标题: Method and apparatus for detecting a start code in a bitstream
- 专利标题(中): 对于在比特流中检测到起始码的方法和装置
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申请号: EP99200584.3申请日: 1999-03-02
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公开(公告)号: EP0948214A3公开(公告)日: 2000-03-15
- 发明人: Murray, Kevin Alistair , Davies, Colin , Stubbings, Clive Anthony , Huggett, Anthony Richard , Warburton, Richard John , Funnel, John Stuart
- 申请人: NDS LIMITED
- 申请人地址: 1 Heathrow Boulevard, 286 Bath Road West Drayton, Middlesex UB7 ODQ GB
- 专利权人: NDS LIMITED
- 当前专利权人: NDS LIMITED
- 当前专利权人地址: 1 Heathrow Boulevard, 286 Bath Road West Drayton, Middlesex UB7 ODQ GB
- 代理机构: Anderson, Angela Mary
- 优先权: GB9807208 19980403
- 主分类号: H04N7/62
- IPC分类号: H04N7/62 ; H04N7/50 ; H04N7/30
摘要:
The present invention relates to the detection of a predetermined sequence in a digital bit-stream, and more particularly a method and apparatus for the fast and efficient detection of a start code sequence. As with many packet based bit-streams, packets are identified through the use of a start code. The start code is a unique sequence which occurs only to indicate the start of a packet, and can never occur in the data portion of a bit-stream. Identifying the start of packets is crucial in the processing of packetised bit-streams. In the field of digital broadcasting, a common format of digital video compression is that of the Moving Picture Expert Group (MPEG). MPEG uses a packetised bit-stream and packets are preceded by a start code to enable individual packets to be identified. In any real-time processing of MPEG bit-streams, it is vital to be able to identify the MPEG start codes as quickly and efficiently as possible. Performing this in hardware is a relatively straightforward operation. Detecting start codes using software is also straightforward in a non real-time situation. However, where an end-to-end real-time software solution is required to process MPEG data it may not be possible or desirable to use a hardware-based solution. The present invention overcomes the problems of the prior art and provides a method and apparatus for the fast and efficient detection of the MPEG start code sequence.
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