Interactive video distribution systems – Access control or blocking – Access via pin or password
Reexamination Certificate
1998-03-20
2001-03-06
Kostak, Victor R. (Department: 2611)
Interactive video distribution systems
Access control or blocking
Access via pin or password
C725S123000
Reexamination Certificate
active
06199205
ABSTRACT:
Motion Picture Expert Group-2 (MPEG-2) is one system for encoding video in a digital form, though it is to be expected that other encoding systems will occur in the future.
MPEG-2 can be transported via terrestrial radio, satellite and cable using the appropriate transmission modulation schemes and associated forward error correction methods. This provides a good quality video delivery arrangement and has a large bandwidth.
An MPEG-2 signal also includes the multi-channel audio encoding and the carrying of additional data.
Many MPEG-2 signals of encoded video, each with additional audio and data information, can be carried by one MPEG-2 TRANSPORT STREAM.
If required an MPEG-2 signal can carry only audio, or only data, which means that an MPEG-2 TRANSPORT STREAM has use as a general purpose method of carrying multiple data signals.
Consequently as the use of MPEG-2 increases, for delivering video, so does the opportunity to use the MPEG-2 TRANSPORT STREAM as a means of delivering other data services.
A complete MPEG-2 signal carrying only data as a high bit rate Teletext type of service may be used for providing general information. However such a fixed type of service is only suitable for carrying general public information even if a charge is made for receiving the information.
While MPEG-2 forms a convenient encoding and transport system for the transmission of data, other systems may be used.
SUMMARY OF THE INVENTION
According to the present invention there is provided a telecommunications data transmission arranged for transmission of data blocks and comprising a unidirectional broadband link and a duplex narrowband start-up link between a first and a second terminal the narrowband link providing control and addressing information regarding data blocks sent via the broadband link from the first to the second terminal.
The broadband link may be a satellite link.
REFERENCES:
patent: 5579367 (1996-11-01), Raymond et al.
patent: 5603077 (1997-02-01), Muckle et al.
patent: WO 94/10803 (1994-05-01), None
patent: WO 94/14273 (1994-06-01), None
patent: WO 94/24783 (1994-10-01), None
Kirschstein et al.
Kostak Victor R.
Marconi Communications Limited
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