JP4211566B2 - Transmission apparatus and method, and program - Google Patents

Description

  The present invention relates to a transmission apparatus and method, and a program, for example, a transmission apparatus and method suitable for use in rebroadcasting a received digital television broadcast transport stream, and a program.

  Television broadcasting in Japan will be shifted to one using digital terrestrial waves (hereinafter referred to as digital terrestrial television broadcasting) instead of the one using conventional analog terrestrial waves.

  By the way, a transport stream (hereinafter referred to as TS) transmitted as a broadcast signal of terrestrial digital television broadcasting is transmitted after being subjected to predetermined digital modulation. Thus, it is known that packets arranged at a predetermined position among packets constituting a TS to be transmitted are not transmitted accurately.

  For example, when a TS composed of packets 1, 2, 3,... As shown in FIG. 1A is subjected to predetermined digital modulation and transmitted, the received TS is in a predetermined position (see FIG. 1B). In the case of 1, the packet arranged at the position of packets 3 and 6 is not received.

Therefore, as a countermeasure against the above-described event, as shown in FIG. 2A, a predetermined digital modulation is performed after inserting a dummy packet at a position of a packet that is not correctly transmitted in the TS to be transmitted, and this modulation method or dummy Transmission is performed together with TMCC (Transmission and Multiplexing Configuration Control) information including information on the number and position of packets (see Non-Patent Document 1, for example).
When a dummy packet is inserted and transmitted in this way, the received TS includes a packet (hereinafter referred to as an invalid packet) that has not been correctly received, as shown in FIG. 2B. The invalid packet is originally a dummy packet, and at the time of reproduction, the invalid packet is eliminated based on the TMCC information received together with the TS. Therefore, the TS as shown in FIG. 2C not including the dummy packet is reproduced. It becomes.

"Transmission method for digital terrestrial television broadcasting" standard ARIB-STD-B31 1.0 version formulated on May 31, 2001

By the way, for example, a digital terrestrial television broadcast TS may be redistributed for the purpose of television broadcasting in a specific facility, measurement of a broadcast signal, or the like. In such a case, it is desired to be able to promptly retransmit even if the terrestrial digital television broadcast TS is scrambled, and to be able to multiplex and transmit TS other than the terrestrial digital television broadcast. .

The present invention has been made in view of such a situation, and not only can a terrestrial digital television broadcast TS be quickly redistributed , but also a TS other than the terrestrial digital television broadcast can be multiplexed and transmitted. Is.

The transmission apparatus of the present invention includes a storage unit that stores the received first transport stream, a generation unit that generates a second transport stream multiplexed with the first transport stream , A modulation scheme of a third transport stream generated by multiplexing the transport stream and the second transport stream, and is actually transmitted due to the modulation scheme that can include the first transport stream. after placing the dummy packets at a position on the third transport stream that is not, in the free positions on the third transport stream that is not a dummy packet, constitute the first transport stream stored the valid packet of have packets arranged, further, dummy packet and the effective Paquet By placing the packets constituting the second transport stream to a free position on the third transport stream bets are not arranged, including a synthesizing means for generating a third transport stream.

Transmitting apparatus of the present invention, the third modulation scheme of the transport stream which memorize has been that the first transport stream and second transport stream are multiplexed, and the information of the number and location of the dummy packet A creation means for creating modulation information that includes the information may further be included.

The transmission method of the present invention includes a storing step of storing a received first transport stream, a generating step of generating a second transport stream multiplexed with the first transport stream , A modulation scheme of a third transport stream generated by multiplexing the transport stream and the second transport stream, and is actually transmitted due to the modulation scheme that can include the first transport stream. after placing the dummy packets at a position on the third transport stream that is not, in the free positions on the third transport stream that is not a dummy packet, constitute the first transport stream stored the valid packet of have packets arranged, further, dummy packet and By placing the packets constituting the second transport stream to a free position on the third transport stream effective packet it is not arranged, including a combining step of generating a third transport stream.

The program of the present invention includes a storing step of storing a received first transport stream, a generating step of generating a second transport stream multiplexed with the first transport stream, and a first transport. This is a modulation method of the third transport stream generated by multiplexing the port stream and the second transport stream, and is not actually transmitted due to the modulation method that can include the first transport stream. after placing the dummy packets at a position on the third transport stream, the empty positions on the third transport stream that is not a dummy packet, constitute the first transport stream stored an effective packet among the packets are arranged, furthermore, Oyo dummy packet By placing the packets constituting the second transport stream to a free position on the third transport stream valid packet is not placed, the process comprising a synthesis step of generating a third transport stream Ru cause the computer to execute the transmitting device.

Oite the present invention, the first transport stream received is stored, a second transport stream first transport stream multiplexed is generated. Furthermore, the modulation method is a modulation method of a third transport stream generated by multiplexing the first transport stream and the second transport stream, and is caused by the modulation method capable of including the first transport stream. in fact, after the dummy packet is placed at a position on the third transport stream not sent Te, the empty positions on the third transport stream that is not a dummy packet, the stored first transport The valid packets of the packets constituting the stream are arranged , and further, the packets constituting the second transport stream are arranged at empty positions on the third transport stream where the dummy packets and the valid packets are not arranged. by being arranged, the third transport stream It is generated.

  According to the present invention, it is possible to quickly redistribute TS of terrestrial digital television broadcasting at low cost.

Embodiments of the present invention will be described below .

  A configuration example of a redistribution apparatus that receives and redistributes a terrestrial digital television broadcast TS according to an embodiment of the present invention will be described below with reference to FIG. This redistribution device multiplexes a TS (hereinafter referred to as TS1) obtained by receiving digital terrestrial television broadcasting and a newly generated TS (hereinafter referred to as TS2) to generate TS3, This is a distribution system. Without generating TS2, TS1 and dummy TS may be multiplexed to generate TS3.

  The broadcast receiving unit 1 extracts TS1 corresponding to channel selection such as a user from a terrestrial digital television broadcast signal input from an antenna (not shown), and outputs the TS1 to the TS storage unit 2. The TS storage unit 2 includes a recording medium such as a hard disk or a semiconductor memory, and stores TS1 output from the broadcast receiving unit 1. The TS 1 stored in the TS storage unit 2 is a target for redistribution.

The TS generator 3 generates a new TS 2 using input video data, audio data, EPG (Electronic Program Guide) data, caption data, and the like as materials. The TS2 generated by the TS generation unit 3 is multiplexed with the redistributed TS1 and distributed. TMCC information generating unit 4, if not multiplexed modulation scheme TS3 generated as (QPSK (0 Segment) 64QAM (13 segment) (TS2 in TS synthesizing unit 6), or a QPSK (1 segment) 64QAM ( 12 segments) and the like, and TMCC information including information on the number and position of dummy packets is generated and output to the dummy packet processing unit 5. Based on the TMCC information generated by the TMCC information generation unit 4, the dummy packet processing unit 5 positions the dummy packet in order to deal with an event in which there is a packet that is distributed and cannot be accurately received on the receiving side. And the position information is output to the TS synthesis unit 6.

  The TS generation unit 6 arranges dummy packets based on the position information from the dummy packet processing unit 5 for the TS 3 to be generated, and then reads out the packets constituting the TS 1 stored in the TS storage unit 2 Finally, TS3 is completed by arranging packets constituting TS2 generated by TS generation unit 3, and output to modulation unit 7 together with TMCC information.

  Modulation section 7 modulates TS3 and TMCC information generated by TS combining section 6 according to a predetermined modulation scheme (for example, OFDM (Orthogonal Frequency Division Multiplex) scheme), and outputs the result to distribution section 8. The distribution unit 8 distributes TS3 and TMCC information modulated by the modulation unit 7.

  Next, redistribution processing by the redistribution apparatus will be described with reference to the flowchart of FIG. In step S1, the broadcast receiving unit 1 extracts TS1 from a terrestrial digital television broadcast signal input from an antenna in response to channel selection by a user or the like. The TS storage unit 2 stores the TS1 extracted by the broadcast receiving unit 1. On the other hand, the TS generation unit 3 generates a new TS2 using input video data, audio data, EPG data, caption data, and the like as materials. Further, the TMCC information generation unit 4 generates TMCC information corresponding to TS3 generated by the TS synthesis unit 6 and outputs the TMCC information to the dummy packet processing unit 5.

  In step S <b> 2, the dummy packet processing unit 5 specifies the position where the dummy packet is placed based on the TMCC information, and outputs the position information to the TS combining unit 6. For example, as shown in FIG. 5A, the TS generation unit 6 arranges dummy packets (indicated by hatching in the figure) on the TS 3 to be generated based on the position information from the dummy packet processing unit 5.

  In step S3, the TS generator 6 stores, for example, a PCR (Program Clock Reference) packet including a time stamp as shown in FIG. 5B, a dummy packet not correctly received, and data stored in the TS storage 2 As a valid packet (S10, S11, etc.), and TS1 composed of invalid null packets as data is read out, and dummy packets and null packets are excluded, as shown in FIG. 5C, PCR packets and valid packets Are arranged at the same position in TS3 as the position in TS1 without disturbing the arrangement order thereof.

  Note that dummy packets and null packets can be identified without the TMCC information of TS1. Further, when a dummy packet is already arranged at the same position in TS3 as that in TS1, the dummy packet is arranged so as to be offset while avoiding the dummy packet. In this case, the time stamp included in the PCR packet is also finely adjusted by the offset amount.

  In step S4, the TS synthesizing unit 6 sets the TS2 generated by the TS generating unit 3 for the empty position of TS3 (state in FIG. 5C) where the dummy packet and the TS1 PCR packet and the valid packet as data are arranged. By arranging the packets to be configured (denoted as TS2 in FIG. 5D), TS3 shown in FIG. 5E is completed.

  Alternatively, in step S4, the TS combining unit 6 sets a null packet (Null in FIG. 5E) to the empty position of TS3 (state of FIG. 5C) in which the dummy packet and the TS1 PCR packet and the packet effective as data are arranged. The TS3 shown in FIG. 5E is completed. In this case, it is desirable to define the modulation schemes as QPSK (0 segment) and 64QAM (13 segments).

  In step S <b> 5, the modulation unit 7 modulates TS <b> 3 and TMCC information generated by the TS synthesis unit 6 according to a predetermined modulation method, and outputs the result to the distribution unit 8. In step S6, the distribution unit 8 distributes TS3 and TMCC information modulated by the modulation unit 7. This completes the redistribution process.

  As described above, according to the redistribution apparatus to which the present invention is applied, TS1 extracted from the terrestrial digital television broadcast signal can be included in TS3 and distributed without using the broadcasted TMCC information. Become. Moreover, since TCMM information of terrestrial digital television broadcasting is not used, expensive equipment for exclusive use of terrestrial digital television broadcasting is not required.

  Further, according to the redistribution apparatus, the arrangement order and the time relationship between the PCR packets constituting TS1 and the packets effective as data are not changed in TS3 to be distributed, so even when TS1 is scrambled Applicable. Further, the present invention can be applied not only to the TS1 format, that is, not only to terrestrial digital television broadcasting TS but also to redistributing BC digital broadcasting, CS110 ° broadcasting, DVB (Digital Video Broadcasting) TS. .

  In the present specification, the steps for describing the program of the present invention are executed in parallel or individually even if they are not necessarily processed in time series, as well as processes performed in time series according to the described order. It also includes processing.

It is a figure for demonstrating the characteristic of digital modulation. It is a figure explaining providing a dummy packet as a countermeasure with respect to the characteristic of digital modulation. It is a block diagram which shows the structural example of the redistribution apparatus which is one embodiment of this invention. It is a flowchart explaining the redistribution process by a redistribution apparatus. It is a figure for demonstrating the redistribution process by a redistribution apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Broadcast receiving part, 2 TS memory | storage part, 3 TS production | generation part, 4 TMCC information production | generation part, 5 Dummy packet production | generation part, 6 TS synthetic | combination part, 7 Modulation part, 8 Distribution part

Claims (4)

In a transmission apparatus for retransmitting a first transport stream obtained by receiving a digital broadcast,
Storage means for storing the received first transport stream,
Generating means for generating a second transport stream multiplexed with the first transport stream;
A modulation scheme of a third transport stream generated by multiplexing the first transport stream and the second transport stream , and the modulation scheme capable of including the first transport stream. Due to the fact that a dummy packet is arranged at a position on the third transport stream that is not actually transmitted , the dummy packet is stored at an empty position on the third transport stream where no dummy packet is arranged . Valid packets of the packets constituting the first transport stream are arranged , and the dummy packets and the valid packets are arranged at empty positions on the third transport stream where the valid packets are not arranged . to place the packets constituting the second transport stream Ri, the third including transmitting apparatus and a combining means for generating a transport stream. It remembers to said that the said first transport stream second transport stream are multiplexed third modulation scheme of the transport stream, as well as modulation information including the information of the number and location of the dummy packet Further includes creating means for creating
Transmitting apparatus according to 請 Motomeko 1. In the transmission method of the transmission apparatus for retransmitting the first transport stream obtained by receiving the digital broadcast,
A storage step of storing the received first transport stream,
Generating a second transport stream multiplexed with the first transport stream;
A modulation scheme of a third transport stream generated by multiplexing the first transport stream and the second transport stream , and the modulation scheme capable of including the first transport stream. Due to the fact that a dummy packet is arranged at a position on the third transport stream that is not actually transmitted , the dummy packet is stored at an empty position on the third transport stream where no dummy packet is arranged . Valid packets of the packets constituting the first transport stream are arranged , and the dummy packets and the valid packets are arranged at empty positions on the third transport stream where the valid packets are not arranged . to place the packets constituting the second transport stream Ri, the third synthesis step and the including transmission method of generating a transport stream. A program for controlling a transmission device that retransmits a first transport stream obtained by receiving a digital broadcast,
A storage step of storing the received first transport stream,
Generating a second transport stream multiplexed with the first transport stream;
A modulation scheme of a third transport stream generated by multiplexing the first transport stream and the second transport stream , and the modulation scheme capable of including the first transport stream. Due to the fact that a dummy packet is arranged at a position on the third transport stream that is not actually transmitted , the dummy packet is stored at an empty position on the third transport stream where no dummy packet is arranged . Valid packets of the packets constituting the first transport stream are arranged , and the dummy packets and the valid packets are arranged at empty positions on the third transport stream where the valid packets are not arranged . to place the packets constituting the second transport stream Ri, the third program that the processing including the synthetic steps of generating a transport stream Ru cause the computer to execute the transmitting device.

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