EXPLOITATION OF NULL PACKETS IN PACKETIZED DIGITAL TELEVISION SYSTEMS
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Abstract
A system and method for adding auxiliary data DA to an output data stream from a statistical multiplexer is disclosed. An auxiliary multiplexer accepts a statistically multiplexed data stream, and substitutes auxiliary data packets for null data packets. The auxiliary multiplexer controls the number of null packets in the statistically multiplexed data stream by controlling the target bandwidth BT of the statistical multiplexer, or by modifying the statistical multiplexer equation to make the auxiliary data stream a participant in the negotiation process of allocating throughput among the data sources.
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Citations
47 Claims
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1-28. -28. (canceled)
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29. A method of adding auxiliary data DA to a data stream, comprising the steps of:
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accepting a statistically multiplexed data stream having null data, wherein the data stream comprises a set of data packets all having a packet ID including a first data packet and a second data packet temporally adjacent the first data packet; and substituting at least a portion of the auxiliary data DA for the null data in the statistically multiplexed data stream comprising substituting at least a portion of the auxiliary data DA for the data in the second data packet if the first data packet includes at least a number NB consecutive zero data values and the second data packet includes all zero data values. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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38. A method of adding auxiliary data DA to a statistically multiplexed data stream, comprising the steps of:
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controlling an amount of the null data in the statistically multiplexed data stream to provide sufficient null data to permit the substitution of at least some of the auxiliary data DA in the statistically multiplexed data stream for the null data; and substituting at least a portion of the auxiliary data DA for the null data in the statistically multiplexed data stream. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification