Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-02-20
2002-03-05
Chin, Wellington (Department: 2735)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
Reexamination Certificate
active
06353613
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an information transmitting device and a transmitting method, and is suitably applied to a digital broadcasting system which broadcasts upon digitalizing information such as video and audio for example.
BACKGROUND ART
Heretofore, various compression encoding systems have been proposed to decrease the volume of information of video and audio. One representative system is a compression encoding system called MPEG2 (Moving Picture Experts Group Phase 2) which is standardized by the organization such as ISO (International Organization for Standardization). The MPEG2 system has been standardized in order to transmit video and audio.
In recent years, a digital broadcasting system has been devised, which compression-encodes video and audio utilizing the MPEG2 system and broadcasts the compression-encoded video and audio utilizing the ground wave and satellite wave. In the digital broadcasting system, encoded video data and audio data are packetted for every fixed block and the resultant packet lines are transmitted (hereinafter, the packet line is referred to as a transport stream and the packet for generating the transport stream is referred to as a TS (transport stream) packet). In this case, the transport stream packet (TS packet) is comprised of a data section and a header section as shown in
FIG. 1
, and wherein the data section stores video data and audio data to be transmitted and the header section stores a synchronous byte and a packet identifier (hereinafter, referred to as PID) or various other packet control data. In this connection, the synchronous byte is data showing the beginning of packet and the PID is data showing the content of information stored in the packet.
Further, in the digital broadcasting system, by packetting the data to be transmitted, video and audio data of plural programs are multiplexed so that plural programs can be broadcast through one circuit. However, in the case of multiplexing data of plural programs, the receiver side must extract and decode the TS packet in which the video data and audio data of the program desired by an audience have been stored, from the transmitted TS packets. Therefore, the extracting work makes the process of the receiver side complicated.
Thus, in the digital broadcasting system, additional information on the program called program specific information (PSI) is packetted and transmitted, and the receiver side refers to the PSI to extract and decode the TS packet having the desired program. In this connection, in case of packetting the PSI, the PSI is stored in the data section having the packet structure shown in FIG.
1
.
The PSI is roughly classified into a program map table (PMT), a program association table (PAT), a conditional access table (CAT), and a network information table (NIT). The PMT is a corresponding table (hereinafter, referred to as a table) showing the PID values of the TS packets in which video data and audio data to form the program are stored. For example, in the program number “X”, the table shows that the video is PID=“XV” and the audio is PID=“XA”. Further, the PAT is a table showing the PID value of the TS packet in which the PMT is stored. For example, the table shows that the PMT with the program number “0” is PID=“AA”, the PMT with the program number “1” is PID=“BB”, and the PMT with the program number “X” is PID=“XX”. Further, the CAT is a table showing the PID value of the TS packet in which lock code decipher information for deciphering the scrambled video and audio data is stored. Furthermore, the NIT is a table showing the PID value of the TS packet in which physical information on transmission route is stored, and the PID value of the TS packet in which the NIT is stored is designated by the PAT.
When the PSI is transmitted, the receiver side first obtains the PAT by extracting the TS packet in which the PAT has been stored, examines the TS packet in which the PMT for the program desired by the audience has been stored by referring to the PAT, and obtains the PMT by extracting the corresponding TS packet. Then, the receiver side refers to the PMT to examine the TS packet in which video and audio data of the program desired by the audience, and extracts the corresponding TS packet to obtain and decode the video and audio data. Thereby, the program desired by the audience can be easily reproduced.
Note that, in the digital broadcasting system, additional information on a program called service information (SI) is transmitted other than aforementioned information, and is utilized with various forms at the receiver side. In this connection, the SI is classified into a bouquest association table (BAT), a service description table (SDT), an event information table (EIT), a time and date table (TDT), a running status table (RST), a stuffing table (ST), and so on. And the detailed SI is disclosed in the literature “Digital Broadcasting Systems for television, sound and data services; Specification for Service Information (SI) in Digital Video Broadcasting (DVB) systems (ETS
300
468
)” published by the Europe electric transmission standardization association (ETSI).
In this connection, the PID values of TS packets in which the aforementioned PSI and SI or video data and audio data are stored are determined in advance as shown in FIG.
2
. More specifically, the PAT is stored in the TS packet having the “0X0000” PID, and the CAT is stored in the TS packet having the “0X0001” PID. Further, the TS packet having the “0X0010” PID stores the NIT and ST, the TS packet having the “0X0011” PID stores the SDT, BAT, and ST, the TS packet having the “0X0012” PID stores the EIT and ST, the TS packet having the “0X0013” PID stores the RST and ST, and the TS packet having the “0X0014” PID stores the TDT. Furthermore, the TS packets having from the “0X0020” PID to the “0X1FFE” PID store the PMT and NIT or video data and audio data.
By the way, in the case of realizing the digital broadcasting system described above, the construction shown in
FIG. 3
will be generally considered. More specifically, as shown in
FIG. 3
, a digital broadcasting system
1
is comprised of a transmitting device
2
which is equivalent to a broadcasting station, for encoding and transmitting video and audio data, and a receiving device
3
which is installed in each home, for receiving and decoding the data transmitted from the transmitting device
2
.
In such the digital broadcasting system
1
, when the transmitting device
2
receives a transport stream multiplexed at another transmitting device and newly multiplexes another program onto the multiplexed transport stream to transmit it, the receiving device
3
must surely receive it on the basis of the additional information of packet.
Further, in the digital broadcasting system shown in
FIGS. 1
to
3
, when such the PSI is transmitted, the receiver side first extracts the TS packet having the “0X0000” PID in which the PAT has been stored in order to obtain the PAT, and then extracts TS packet in which PMT for the program desired by the audience has been stored, by referring to the PAT in order to obtain the PMT. Next, the receiver side examines the TS packet in which the video and audio data of the program desired by the audience has been stored, on the basis of the PMT, and extracts the TS packet to obtain and decode the video and audio data. Thus, the receiver side can easily reproduce the program desired by the audience.
DISCLOSURE OF THE INVENTION
The present invention intends to propose an information transmitting device and transmitting method including other transmitting devices, which can surely decode data with a simple construction as possible in the case of multiplexing and transmitting a plurality of packet lines outputted from a plurality of encoding means.
The present invention comprises a plurality of encoding means for encoding inputted input data, and packetting and outputting the encoded data for every fixed block, an additional information generating means for generatin
Kubota Tatsuya
Matsumura Youichi
Seto Hiroaki
Chang Dexter T.
Chin Wellington
Frommer William S.
Frommer & Lawrence & Haug LLP
Jones Prenell
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