Logical and composite channel mapping in an MPEG network
First Claim
1. A decoder for extracting service information for a particular data service from a broadband data stream containing a plurality of service transport streams carrying a plurality of data services, comprising:
- means for selecting said particular data service from said plurality of data services by specifying a logical channel number;
a tuner which selects a frequency containing service components of said particular data service;
processing means for extracting a logical channel table from said service components, said logical channel table mapping said logical channel number to a particular service transport stream and a program number of said particular service transport stream on which said particular data service can be found; and
means for extracting said particular data service from said broadband data stream by specifying said particular service transport stream and said program number corresponding to said logical channel number selected by said selecting means.
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Accused Products
Abstract
Two additional structures for addition to the Digital Video Broadcasters (DVB) Service Information (SI) for implementation of the MPEG-2 Systems Standard (ISO/IEC 13818-1 are provided: the Logical Channel Table (LCT) and the Composite Channel Table (CCT). The LCT provides the mapping between a Logical Channel Number (LCN) representing a service and the transport stream/program number on which the service can be found. LCT entries may designate either simple conventional channels or Composite Channels. The LCT contains a Composite Channel Indicator (CCI), which when set to `1`, indicates that the selected channel is a composite channel. In this case, the LCT entry gives the home channel of the Composite Channel, which provides the CCT to the decoder so that the tuner can be retuned to the actual program designated in the CCT for current viewing. Each entry in the CCT associates a Composite Channel Number (CCN) with a LCN and represents the "present" definition for the composite channel. A simple LCN is used as a key to the LCT to determine the transport stream ID and program number for the service components in the usual way. As time progresses, the entry for a specific CCN will change; therefore, the CCN is used as a "pointer" to the LCN which is the currently active service for the composite channel. These tables work with conventional MPEG-2 service definitions to decode multi-service transport streams.
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Citations
10 Claims
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1. A decoder for extracting service information for a particular data service from a broadband data stream containing a plurality of service transport streams carrying a plurality of data services, comprising:
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means for selecting said particular data service from said plurality of data services by specifying a logical channel number; a tuner which selects a frequency containing service components of said particular data service; processing means for extracting a logical channel table from said service components, said logical channel table mapping said logical channel number to a particular service transport stream and a program number of said particular service transport stream on which said particular data service can be found; and means for extracting said particular data service from said broadband data stream by specifying said particular service transport stream and said program number corresponding to said logical channel number selected by said selecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification