Generation of valid program clock reference time stamps for duplicate transport stream packets
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United States of America Patent
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Jun 16, 2009
Grant Date -
Nov 22, 2007
app pub date -
May 19, 2006
filing date -
May 19, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention is suitable for use in a communications system that transmits a transport stream, such as an MPEG stream. The present invention addresses the need of generating a valid value for a duplicated packet in the transport stream. A first embodiment of the present invention interpolates between a PCR value in the duplicated packet and the PCR value in the next PCR packet. A second embodiment of the present invention copies an original packet along with its PCR value into a duplicate packet and a PCR-bearing packet. Subsequently, the present invention interpolates a new value for the original packet based on the original value in the duplicated PCR-bearing packet and the previous value in a PCR-bearing packet.
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