Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-10-28
2003-02-25
Kizou, Hassan (Department: 2662)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S473000, C370S522000, C348S467000, C386S349000, C386S349000
Reexamination Certificate
active
06526051
ABSTRACT:
Arrangement comprising insertion means for the identification of an information packet stream carrying encoded digital data by means of additional information.
The invention relates to a system comprising a data source for supplying an information packet stream, and a processing device for processing an information packet stream, and a data sink for receiving an information packet stream, the data source comprising a source for supplying to the processing device an information packet stream including information packets, which information packets contain digital data coded in accordance with a first coding method and/or in accordance with a second coding method and representing picture information or sound information or data information, and the system including a decoder adapted to decode digital data contained on the information packets and coded in accordance with the first coding method.
The invention further relates to a data source for supplying an information packet stream for supplying an information packet stream including information packets, which information packets contain digital data coded in accordance with a first coding method and/or in accordance with a second coding method and representing picture information or sound information or data information.
The invention further relates to a data sink for receiving an information packet stream containing coded digital data in information packets, which digital data can be coded in accordance with a first coding method and/or a second coding method, comprising a recorder for the recording of recording data representing the picture information or sound information or data information contained in the received coded digital data.
The invention further relates to insertion device adapted to receive an information packet stream which contains coded digital data in information packets, which digital data can be coded in accordance with a first coding method and/or a second coding method.
Such a system of the type defined in the first paragraph is known, for example from the European Patent Application having the Application number 97 890 135.3 (PHO 97.519). This known system comprises a plurality of data sources of the type defined in the second paragraph—namely, a transmission device, a cable TV service device, a DVHS apparatus and a DVD apparatus in a reproduction mode. The known system farther comprises a plurality of data sinks of the type defined in the third paragraph—namely, a TV set a DVHS apparatus and a DVD apparatus in a recording mode.
In a recording mode the known DVHS apparatus is adapted to receive picture information or sound information or data information contained in encoded digital data and to record recording data representing said information and complying with the DVHS standard (Victor Company of Japan, No. 07015 of Jul. 25, 1997), on a magnetic tape. The information applied to the DVHS apparatus should then be included in information packets formed by MPEG transport stream packets of an MPEG transport stream. An MPEG transport stream is described in the International Standard ISO/IEC 13.818-1, Part 1 “Systems”, of Jun. 8, 1994. Information packets of such an MPEG transport stream can include digital data representing picture information coded in accordance with the MPEG coding method in compliance with the International Standard ISO/IEC 13.818-2, Part 2 “Video” and information packets of said stream can include digital data representing sound information coded in accordance with the MPEG coding method in compliance with the International Standard ISO/IEC 13.818-3, Part 3 “Audio”. Other information packets of the MPEG transport stream can include digital data representing picture information or sound information coded in accordance with another coding method than said MPEG coding methods. For example, data information can be constituted by data of an electronic program guide supplied by a broadcasting station in an MPEG transport stream. Furthermore, data information can be formed by data of a computer data base of the Internet can be supplied as an MPEG tort stream by a computer connected to the Internet. Moreover, data information can be formed by data stored on a hard disk of a computer, which data is recorded on a magnetic tape of a DVHS apparatus for backup purposes. Alternatively, information packets of an MPEG transport stream can include coded digital data representing picture information or sound information, which data has been coded by means of another coding method tan the MPEG coding method and is marked as “private data” in an MPEG transport stream. By which coding method coded digital data contained in an MPEG transport stream has been coded depends on the relevant data source.
In the known DVHS apparatus an MPEG transport stream received by the DVHS apparatus is converted into a DVHS information packet stream, which during a subsequent reproduction is reconverted into an MPEG transport stream supplied by the DVHS apparatus. The MPEG transport stream supplied by the DVHS apparatus then corresponds to the received MPEG transport stream to be recorded.
In the known system the processing device is a so-called set-top box arranged between the transmission device and the DIVAS apparatus and to which an MPEG transport stream reproduced by the DVHS apparatus or received and supplied by the transmission device can be applied. The set-top box comprises a decoder for decoding coded digital data contained in the MPEG transport stream packets of the MPEG transport stream and coded in accordance with the MPEG coding method, which now forms the first coding method, said data representing the picture information or the sound information.
In connection with the known system it has been found that an MPEG transport stream supplied by the transmission device or reproduced by the DVHS apparatus, in which the MPEG transport stream packets include digital data coded by means of another, i.e. second, coding method and not coded by means of the MPEG coding method, cannot be decoded by the decoder, As a result of this, the user of the know system cannot determine why his TV set produces neither picture nor sound although he has selected the program of a given transmission device with the aid of the processor or although he has set the DVHS apparatus to the reproduction mode. Moreover, the user of the known system can neither dethrone the type of information reproduced by the DVHS apparatus nor can he obtain additional information about the content of the information reproduced by the DVHS apparatus.
It is an object of the invention to eliminate the problems outlined hereinbefore and to provide an improved system of the type defined in the first paragraph, an improved data source of the type defined in the second paragraph, and an improved data sink of the type defined in the third paragraph, in which the afore-mentioned problems are avoided Furthermore, it is an object of the invention to provide insertion devices of the type defined in the fourth paragraph, which can be included both in a data source or in a processor or in a data sink, or which can take the form of a separate device and which enables the afore-mentioned problems to be avoided.
According to the invention, in order to achieve this object in a system of the type defined in the first paragraph, the system comprises an insertion device which—when digital data coded in accordance with a second coding method are present in the information packets—are adapted to insert further digital data coded in accordance with the first coding method into further information packets of the information packet stream, the coded farther digital data containing picture information or sound information as additional information relating to the digital data contained in the information packets, which digital data are coded in accordance with the second coding method and can therefore not be decoded correctly by the decoder. In this way, it is achieved that a user of a TV set, which forms a data sink of the system, receives additional information related to the i
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