Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
1997-10-21
2001-08-28
Chin, Wellington (Department: 2664)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C348S086000
Reexamination Certificate
active
06282212
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a repeat use data inserting apparatus for inserting repeat use data into program data in accordance with appropriate timings, as well as to a digital broadcast transmitting system which comprises the repeat use data inserting apparatus and which transmits a unified stream of program data and repeat use data prepared by the repeat use data inserting apparatus.
Recent years have seen the commercialization of multi-channel digital broadcasting systems using advanced digital compression techniques to transmit numerous channels of program data in a single data stream. The multi-channel digital broadcasting system needs to have the capability of repeatedly inserting so-called repeat use data into each of a plurality of channels of program data in accordance with suitable timings. In the context of this specification, repeat use data refers to repeatedly used data during broadcast such as news clips and commercial messages.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a repeat use data inserting apparatus and a digital broadcast transmitting system using the apparatus, whereby the storage capacity and transfer rate for repeat use data are reduced, the process for changing time base information is eliminated, momentary interruption of video or audio data is averted, and generation of noise is suppressed.
One aspect of the present invention provides a repeat use data inserting apparatus for repeatedly inserting repeat use data into program data in accordance with appropriate timings, and a digital broadcast transmitting system for use with that apparatus, the repeat use data inserting apparatus comprising: data holding means for holding the repeat use data made of a plurality of material data in the form of separately encoded streams; and data multiplexing means for multiplexing separately encoded streams of a plurality of material data constituting the program data during a period other than a data insertion period during which the repeat use data is inserted into the program data, the data multiplexing means further inserting repeatedly the repeat use data into the program data during the data insertion period by multiplexing the separately encoded streams of the plurality of material data constituting the repeat use data held in the data holding means.
In the repeat data inserting apparatus and digital broadcast transmitting system of the invention, the repeat use data is held by the data holding means in the form of separately encoded stream of the plurality of material data. In that setup, during a period other than the data insertion period, the data multiplexing means multiplexes the separately encoded streams of the plurality of material data constituting the program data. During the data insertion period, the data multiplexing means multiplexes the separately encoded streams of the plurality of material data constituting the repeat use data held in the data holding means.
The program data and the repeat use data are multiplexed as described, and so are the separately encoded streams constituting the material data. As a result, a bit stream of repeat use data is repeatedly inserted into a bit stream of program data, whereby a unified stream of data is acquired.
Other objects and further features of the invention will be apparent from the following detailed description when read in conjunction with the accompanying drawings.
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Weiss, S.M., “Switching Facilities In MPEG-2:Necessary But Not Sufficient”, SMPTE Journal, SMPTE Inc. Scarsdale, NY. vol. 104, No. 12, Dec. 1, 1995, pp. 788-802, XP000543847.
Sarginson, P.A., “MPEG-2:A Tutorial Introduction To The Systems Layer”, IEE Colloquium on MPEG What It is and What It Isn't, GB, IEE, London, 1995, pp. 4-1-4-13, XP000560804.
Chin Wellington
Frommer William S.
Frommer & Lawrence & Haug LLP
Pham Brenda
Polito Bruno
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