JP2022028183A - Transmitter and receiver - Google Patents

Abstract

To provide a transmitter that is highly compatible with IP-based communication transmission lines and uses multiple broadcast transmission lines to divide and transmit predetermined data, and a receiver that can reduce jitter when receiving, recombining, and outputting various signals that have been divided and transmitted.SOLUTION: A transmitter 11 inputs a large volume of data from a signal source device 10, converts it into a TLV packet format signal, determines a segmented frame with a frame length that conforms to a transmission method (such as ISDB-S3) used for a plurality of broadcast transmission paths, imparts identification information to uniquely identify a signal order of split frames for each stream to be transmitted, and splits and transmits the signal over the plurality of broadcast transmission paths. A receiver 17 reconstructs the segmented frame on the basis of the identification information at the time of reception of the segmented and transmitted data, concatenates the valid data, and restores it, and adjusts a transmission interval of the output signal in order to reduce jitter when outputting the data as an output signal.SELECTED DRAWING: Figure 1

Description

The present invention relates to the technical fields of satellite broadcasting and terrestrial broadcasting, as well as fixed communication and mobile communication, and more particularly to a transmitting device and a receiving device related to time division multiplex transmission of digital data.

In the digital transmission method, a multi-value modulation method is often used so that more information can be transmitted in the frequency bandwidth available for each service. In order to improve the frequency utilization efficiency, it is effective to increase the number of bits (modulation order) allocated to one symbol of the modulated signal, but the relationship between the upper limit of the information speed that can be transmitted per 1 Hz of frequency and the signal-to-noise ratio is Limited by the Shannon limit. Satellite digital broadcasting is an example of a form of information transmission using a satellite transmission line.

In satellite digital broadcasting currently in use, information is corrected in a receiving device using an error correction code. By adding a redundant signal called a parity bit to the information to be sent, it is possible to control the redundancy (coding rate) of the signal and increase the resistance to noise. The error correction code and the modulation method are closely related, and the theoretical upper limit of the frequency utilization efficiency for the signal-to-noise ratio is called the Shannon limit. The LDPC (Low Density Parity Check) code was proposed by Gallagher in 1962 as one of the powerful error correction codes having a performance approaching the Shannon limit (see, for example, Non-Patent Document 1).

The LDPC code is a linear code defined by a very sparse check matrix H (the elements of the check matrix consist of 0s and 1s and the number of 1s is very small).

The LDPC code is a powerful error correction code that can obtain transmission characteristics approaching the Shannon limit by increasing the code length and using an appropriate inspection matrix, and is a current or next-generation broadcasting service for 4K / 8K super high-definition satellite broadcasting. The LDPC code is also adopted in ARIB STD-B44 (hereinafter referred to as an advanced satellite broadcasting system (ISDB-S3); see, for example, Non-Patent Document 2), which defines the transmission method of the above. By combining multi-value modulation and strong error correction codes such as LDPC codes, transmission with higher frequency utilization efficiency has become possible.

Taking the advanced satellite broadcasting system (ISDB-S3) as an example, the code length of the LDPC code in this system is composed of forward error correction (FEC) frames and is 44,880 bits, which is the BPSK limit (BPSK limit). It has been shown to have performance within about 1 dB (see, for example, Non-Patent Document 3) from the theoretical upper limit of the frequency utilization efficiency with respect to the signal-to-noise ratio when the signal point arrangement is BPSK.

In the advanced satellite broadcasting system (ISDB-S3), the LDPC coding rates are 41/120 (≈1/3), 49/120 (≈2/5), 61/120 (≈1/2), and so on. 73/120 (≈3 / 5), 81/120 (≈2/3), 89/120 (≈3/4), 93/120 (≈7/9), 97/120 (≈4/5), Eleven types of 101/120 (≈5 / 6), 105/120 (≈7 / 8), and 109/120 (≈9 / 10) are defined.

By the way, in recent years, in addition to the current 2K service by satellite / terrestrial broadcasting and 4K / 8K super high-definition by satellite broadcasting, it is expected to newly provide 4K / 8K super high-definition by terrestrial broadcasting. However, focusing on the 12 GHz band used in satellite broadcasting, the available frequencies are tight, and it is difficult to secure sufficient frequency bandwidth for the transmission of next-generation content that exceeds 4K / 8K services. The situation is.

Therefore, there is a technique called bulk transmission in which a large-capacity transmission is divided into bands and transmitted in a situation where a sufficient bandwidth cannot be secured (see, for example, Patent Document 1). A technique for dividing and transmitting data is also known in the communication field, and is realized as a carrier agreement (see, for example, Non-Patent Document 4).

Japanese Unexamined Patent Publication No. 2009-260408

R. G Gallager, “Low Density Parity Check Codes,” in Research Monograph series Cambridge, MIT Press, 1963 "Transmission method for advanced broadband satellite digital broadcasting (ISDB-S3) standard ARIB STD-B44 2.1 version", [online], revised on March 25, 2016, ARIB, [search on July 7, 2016] , Internet <URL: https://www.arib.or.jp/kikaku/kikaku_hoso/std-b44.html> Suzuki et al., "Design of LDPC Codes for Advanced BS Digital Broadcasting", Journal of Video Information Media Society, General Incorporated Association Video Information Media Society, Video Information Media vol.62, No.12, December 1, 2008, pp.1997 -2004 "Carrier Aggregation", [online], [Search on July 7, 2nd year of Reiwa], Internet <URL: https://www.fujitsu.com/jp/group/mtc/technology/course/carrier-aggregation/>

As described above, there is known a technique called bulk transmission in which a large-capacity transmission is divided into bands and transmitted in a situation where a sufficient bandwidth cannot be secured.

In addition, with the fusion of broadcasting and communication in recent years, the diversification of transmission forms beyond the boundaries of radio waves is progressing, and in particular, communication transmission lines and broadcasting transmission lines in communication transmission methods based on IP (Internet Protocol). Construction of a transmission system for data transmission using the above is in progress. Next-generation communication networks such as the 5th generation mobile communication system (5G) are also effective in integrating with broadcast transmission lines (particularly satellite transmission lines), and in the future, broadcast transmission methods will be IP-based communication. It is expected that the demand for commonality with transmission methods will accelerate further.

For example, a bulk transmission broadcasting technology that enables large-capacity transmission under a tight situation of satellite broadcasting frequencies in the 12 GHz band is required to have a high affinity for IP-based communication transmission methods. .. That is, in the future, in a situation where sufficient bandwidth cannot be secured for data transmission, a large amount of data is divided into bands (frequency allocation) for bulk transmission using a plurality of broadcast transmission lines, and IP is used as a base. A technique that can be easily converted or combined with transmission data by fusing into a communication transmission path in a communication transmission method is desired. At least, in the advanced satellite broadcasting system (ISDB-S3) used for 4K / 8K satellite broadcasting, it is assumed that it has a high affinity for IP-based communication transmission lines in the future, and multiple broadcasting transmission lines will be used. Therefore, a transmitting device and a receiving device for controlling bulk transmission of a large amount of data by dividing it into bands (frequency allocation) are required.

Further, a technical problem related to control in realizing bulk transmission is that when various divided signals are transmitted, reordering occurs in which the signals are switched back and forth in the process of signal transmission. In particular, since the signal transmission order is not guaranteed in the IP network, reordering often occurs.

Further, it is conceivable to operate a system in which various divided signals are recombined and output as an IP packet on the receiving device side after bulk transmission from the transmitting device side. In this case, if the transmission interval of the IP packet varies and packet jitter occurs, the arrival of the IP packet to the output destination device of the receiving device varies, so that the output destination device cannot process the received IP packet. Alternatively, there arises a problem that the memory size for absorbing the variation increases.

Therefore, an object of the present invention is to have a high affinity for an IP-based communication transmission line in view of the above-mentioned problems, and to use a plurality of broadcast transmission lines in a TLV (Type Length Value) packet format. In order to divide and transmit a predetermined data in, a transmission device that enables the receiving side to appropriately return the signal order to the original order even when the signal order is changed such as reordering, and the divided transmission is performed. It is an object of the present invention to provide a receiving device capable of reducing jitter when receiving various signals, recombining them, and outputting them.

The transmission device of the present invention is a transmission device that bulk-transmits predetermined data in a TLV (Type Length Value) packet format using a plurality of broadcast transmission paths, and is a predetermined transmission device to be bulk-transmitted from a signal source device. A TLV signal generation means for inputting data and converting it into a TLV packet format signal and a divided frame having a frame length conforming to a transmission method common to a plurality of broadcast transmission lines used for the bulk transmission are defined, and the predetermined frame is defined. When the information bit rate required for data transmission falls within the maximum transmission rate of the plurality of broadcast transmission lines, the division frame is composed of the number of basic division slots corresponding to the plurality of broadcast transmission lines, and the predetermined data is specified. When the information bit rate required for transmission exceeds the maximum transmission rate that can be transmitted on the plurality of broadcast transmission lines, a predetermined number of basic division slots for transmission via the communication transmission line of the IP (Internet Protocol) network are provided. In addition to the number of basic division slots corresponding to a plurality of broadcast transmission paths, the division frame is configured, and the predetermined data converted into the TLV packet format signal based on the division frame is divided and transmitted. Each transmitter in a plurality of broadcast transmission lines and a division frame generation means for controlling connection to the communication transmission line are provided, and the division frame generation means constitutes each of the division frames for each stream to be transmitted. The basic division slot is characterized by having a means for imparting identification information for uniquely specifying the signal order of the division frame.

Further, in the transmitting device of the present invention, the divided frame generation means sets the head TLV packet indicating the head TLV packet to each basic split slot constituting the split frame to another TLV packet in each basic split slot. It is determined by the setting in the TLV header so as to be distinguished from the above, and the divided frame is configured so that the receiving side can identify which of the divided frames the TLV packet indicates the head of which basic divided slot. It is characterized by.

Further, in the transmitting device of the present invention, the divided frame generation means increments the numerical value of the packet type field in the head TLV packet indicating the head TLV packet of each basic split slot from a predetermined initial value for each stream to be transmitted. The identification information is formed by repeating the increment within a predetermined range, and is provided in each basic division slot.

Further, in the transmission device of the present invention, when the divided frame generation means constitutes the divided frame, the divided frame generation means calculates the corresponding information bit rate based on the coding modulation method of each of the plurality of broadcast transmission lines. A basic division slot for a plurality of broadcast transmission lines by inserting a null after the data allocated according to each information bit rate so that the frame length of the division frame constituting each basic division slot becomes a constant value. Further, it is characterized in that a basic division slot for the communication transmission line is formed in accordance with the plurality of broadcasting transmission lines.

Further, in the transmission device of the present invention, the divided frame generation means can change the number of slot divisions of the basic division slots constituting the divided frame when the predetermined data is divided and bulk transmitted in the TLV packet format. It is characterized by having a means for notifying the receiving side of information on the number of slot divisions of the basic division slots constituting the division frame and the unique number of each basic division slot.

Further, in the transmission device of the present invention, when the divided frame configured by the divided frame generation means includes a predetermined number of basic divided slots for transmission via the communication transmission path of the IP network, the predetermined number of basic divided slots is included. Is divided into IP-based packets consistent with the IP network, and an IP sequence number for uniquely specifying the signal order of the packets is assigned to each divided IP-based packet for the receiving device. It is characterized by further providing an IP encapsulation means for transmitting to.

Further, the receiving device of the present invention is a receiving device that receives the predetermined data bulk-transmitted by the transmitting device of the present invention, and is bulk-transmitted via the plurality of broadcasting transmission lines and the communication transmission line. To receive a signal in the TLV packet format, perform IP decapsulation on the IP-based packet transmitted via the communication transmission line of the IP network, and uniquely specify the signal order given in the packet. After arranging the signal order based on the IP sequence number, the TLV signal is extracted to reconstruct the predetermined number of basic division slots, and the division frame generated by the transmission device is reconstructed based on the identification information. The divided frame reconstructing means for rearranging the data is concatenated with the valid data of each basic divided slot based on the reconstructed divided frame, and the predetermined data having the same signal format as that transmitted from the signal source device is restored. It is characterized by comprising an output signal generation means for adjusting the transmission interval of the output signal to be externally output in order to reduce jitter at the time of external output of the predetermined data.

Further, in the receiving device of the present invention, the divided frame reconstructing means heads based on the setting information in the TLV header among the TLV packet format signals received via the plurality of broadcasting transmission lines and the communication transmission lines. The TLV packet is discriminated, the TLV packet indicating the head of which basic split slot in which split frame is discriminated, the TLV header between the basic split frames is discriminated, and the split frame generated by the transmission device is discriminated. It is characterized in that it is rearranged so as to reconstruct.

Further, in the receiving device of the present invention, the identification information is assigned by incrementing the numerical value of the packet type field in the head TLV packet indicating the head TLV packet of each basic division slot from a predetermined initial value and within a predetermined range. It is formed by repeating the increment and is assigned in each basic division slot, and the division frame reconstructing means is a TLV packet format signal received via the plurality of broadcast transmission lines and the communication transmission line. Among them, it is characterized in that sorting is performed so as to reconstruct the divided frame based on the numerical value of the packet type field in the head TLV packet given as the identification information.

Further, in the receiving device of the present invention, the divided frame reconstructing means calculates the corresponding information bit rate based on the coding modulation method of each of the plurality of broadcast transmission lines when reconstructing the divided frame. Then, a null is inserted after the data allocated according to each information bit rate so that the frame length of the divided frame constituting each basic divided slot becomes a constant value, and the basic divided slot for the plurality of broadcast transmission lines is inserted. , And the basic division slot for the communication transmission line is formed in accordance with the plurality of broadcast transmission lines.

Further, in the receiving device of the present invention, the divided frame generating means is based on the information of the number of divided slots of the basic divided slots constituting the divided frame and the unique number of each basic divided slot, which is notified in advance by the transmitting device. It is characterized by having a means for identifying the structure of the divided frame to be reconstructed.

Further, in the receiving device of the present invention, the transmission interval adjusting means receives the predetermined data divided by the transmitting device by the receiving device, reconstructs it as an output signal of an IP packet string, and outputs the data to the outside. , Calculate the transmission interval of each IP packet from the processing time corresponding to the information bit rate of the predetermined data and each packet length of the IP packet string, and output each IP packet of the IP packet string according to the transmission interval. Therefore, it is characterized by having a means for suppressing variation in the transmission interval of IP packets.

According to the present invention, even in an environment where the frequency of a broadcast transmission line is tight, it is possible to increase the overall transmission capacity related to data transmission and realize a transmission system having a high affinity with IP. In particular, data transmission synchronization between a transmitting device and a receiving device can be facilitated and stabilized, and the ease of connection to the broadcast transmission line and communication transmission line to be used (easiness of synchronization of connection timing) can be improved. Furthermore, the receiving device can appropriately return the signal order to the original order even when the signal order is changed such as reordering, and packet jitter is reduced by adjusting the transmission interval of the output signal such as an IP packet. It is possible to reduce it.

It is a block diagram which shows the schematic structure of the transmission system provided with the transmission device and the reception device of one Embodiment by this invention. It is a block diagram which shows the schematic structure of the transmission device of one Example by this invention. It is a block diagram of the TLV packet used in the transmission apparatus of one Example by this invention. It is a block diagram of the division frame used in the transmission apparatus of one Example by this invention. It is a block diagram of the head TLV packet which concerns on the division frame used in the transmission apparatus of one Example by this invention. In the transmitting device of one embodiment according to the present invention, the numerical value of the packet type field in the head TLV packet is used as the identification information for uniquely specifying the signal order of the divided frames in each basic divided slot constituting the divided frame. It is a figure which shows the example of giving an increment in a predetermined range. The relationship between the modulation method of each transmitter (eg ISDB-S3) controlled by the transmitter of one embodiment according to the present invention, the LDPC coding rate, the payload size of the basic division slot, and the length of the null TLV packet to be inserted is illustrated. It is a figure. This is a configuration example of a basic division slot when 16APSK (LDPC coding rate: 7/9) is fixed as a coding modulation method supported by a transmitter (example: ISDB-S3). In the transmitting device of one embodiment according to the present invention, a packet including an IP sequence number assigned for divided transmission of an IP-based packet when a basic divided slot utilizing transmission via an IP network is included in the divided frame. It is a figure which shows the structure. As a coding modulation method supported by each transmitter (example: ISDB-S3), the number of frame divisions when 16APSK (LDPC coding rate: 7/9) is fixed is 5 (for 4 transmitters (broadcast transmission lines) and 1). This is a configuration example of a basic division slot for individual IP networks (communication transmission lines). It is a block diagram which shows the schematic structure of the receiving apparatus of one Example by this invention. It is a figure for demonstrating the operation of the transmission device and the receiving device of one Example according to this invention. It is a figure for demonstrating the operation example of one stream equal division rate as the operation of the transmission device and the receiving device of one Example by this invention. It is a figure for demonstrating the operation example of 1 stream unequal rate as the operation of the transmission device and the receiving device of one Example by this invention. It is a figure for generalizing and explaining the operation of one stream unequal division rate as the operation of the transmission device and the reception device of one Example according to this invention. As an application example of the operation of the transmission device and the reception device of one embodiment according to the present invention, it is a figure for demonstrating the operation example of the two-stream unequal rate.

Hereinafter, the transmission system 1 including the transmission device 11 and the reception device 17 according to the embodiment of the present invention will be described in detail with reference to the drawings.

(Transmission system)
FIG. 1 is a block diagram showing a schematic configuration of a transmission system 1 including a transmission device 11 and a reception device 17 according to an embodiment of the present invention. In the example of the transmission system 1 shown in FIG. 1, the signal source device 10, the transmitter 11, m (m> 1) transmitters 12-1, 12-2, ..., 12-m (hereinafter collectively referred to as " Also referred to as "transmitter 12"), m-unit transmitting antennas 13-1, 13-2, ..., 13-m (hereinafter collectively referred to as "transmitting antenna 13"), broadcasting satellite 14, in this example. One receiving antenna 15, m receivers 16-1, 16-2, ..., 16-m (hereinafter collectively referred to as "receiver 16"), a receiving device 17, a display device 18, and It is configured to include an IP network 19.

Each of the m transmitters 12 and the corresponding m receivers 16 in the transmission system 1 according to the present embodiment are devices compliant with the advanced satellite broadcasting system (ISDB-S3), and ISDB- Data can be transmitted by the coded modulation method supported by S3 (LDPC code and maximum multi-valued modulation 32APSK according to the current standard). That is, the transmitter 12-m performs LDPC coding processing (may add a BCH code) according to a predetermined LDPC coding rate on the data to be transmitted, and performs mapping according to a predetermined modulation method to obtain a modulated signal. Generate and uplink towards broadcast satellite 14. The broadcasting satellite 14 downlinks the modulated signal toward the receiving antenna 15. The receiver 16-m receives the modulation signal via the receiving antenna 15, performs demodulation / decoding processing corresponding to the coding modulation method of the transmitter 12-m, and the data transmitted from the transmitter 12-m. To restore. In addition, one receiver having the function of m receivers 16 may be used.

That is, the m transmitter 12, the m transmitting antenna 13, the broadcasting satellite 14, the receiving antenna 15, and the m receiver 16 are so-called Multi-Input Multi-Output (MIMO) or Multi-Input Single-. Similar to the Output (MISO) broadcast transmission system, it constitutes a plurality of (m) broadcast transmission lines. The IP network 19 constitutes a communication transmission line in an IP-based communication transmission method. For example, the IP network 19 can be a general communication transmission line configured by an Internet protocol such as IPv4 or IPv6. In this example, an example in which a plurality of satellite transmission lines are used as the broadcast transmission line will be described, but the present invention is not limited to this, and a plurality of next-generation terrestrial transmission lines may be used.

Then, the transmitter 11 uses a plurality of broadcast transmission lines (satellite transmission lines in this example) and, if necessary, a communication transmission line by the IP network 19, to obtain a large amount of data acquired from the signal source device 10. The m transmitters 12 are controlled so as to perform bulk transmission toward the receiving device 17.

The signal source device 10 shown in FIG. 1 is a device that sends data to be transmitted by the transmission system 1 to the transmission device 11, and the transmission device 11 can also use the communication transmission path by the IP network 19. Therefore, even if the transmission rate is higher than the maximum transmission rate (information bit rate of 147.4578 Mbps at 32APSK (9/10)) that can be transmitted by the m transmitters 12, data is transmitted to the transmission device 11. It can be sent.

For example, the transmitter 11 inputs data of an _Iall information bit rate exceeding the maximum transmission rate that can be transmitted by the m transmitters 12 from the signal source device 10 to the m transmitters 12 and the IP network 19. On the other hand, the data is distributed and output based on the division frame described later with reference to FIG. Specifically, the transmitter 11 has an information bit rate I ₁ for the transmitter 12-1, an information bit rate I 2 for the transmitter 12-2, and an information bit rate I ₂ for the transmitter 12-m. Distributes at the information bit rate _Im , and obtains the remaining data exceeding the maximum transmission rate that can be transmitted by the _m transmitters 12 from the signal source device 10 at the information bit rate In for the IP network 19. A large amount of data is distributed and output.

When the information bit rate of the large-capacity data acquired from the signal source device 10 is I _all , the information bit rates I ₁ , I ₂ , ..., In after distribution by the I _all and the transmission device 11 are _interspersed with each other. When the measurement range of the information bit rate is limited to the actual data (feedage excluding the header) such as video and audio to be transmitted, the following equation (1) holds.

Here, the transmitter 11 determines in advance m transmitters 12 to be used as a satellite transmission path when transmitting a large amount of data acquired from the signal source device 10, and each of the m transmitters 12 Since the maximum value that can be transmitted is determined by the modulation method and LDPC coding rate set in, TMCC (Transmission and Multiplexing Configuration Control) that specifies the modulation method and LDPC coding rate from each of the m transmitters 12 By acquiring information (TMCC ₁ , TMCC ₂ , ..., TMCC _m ), the information bit rates I ₁ , I ₂ , ..., _Im can be determined. When the _m transmitters 12 are predetermined to use a fixed coding modulation method, the information bit rates I ₁ , I ₂ , ..., Im are determined without acquiring TMCC information. be able to.

Then, when the information bit rate _Iall of the large-capacity data acquired from the signal source device 10 can be transmitted only by the m transmitters 12 without using the IP network 19, the transmitter 11 has the m units. The large amount of data is distributed within the range of the transmitter 12.

The _m transmitters 12 generate modulation signals based on their respective coding modulation methods for each of the information bit rates I ₁ , I ₂ , ..., Im distributed to each of the transmitters 12, and the respective transmitting antennas. Uplink to the broadcasting satellite 14 via 13.

Each of the modulated signals from the m transmitters 12 uplinked to the broadcasting satellite 14 is downlinked all at once toward the receiving antenna 15 in the service area covered by the broadcasting satellite 14.

Each of the m receivers 16 receives the corresponding modulation signal from the m transmitter 12 via the receiving antenna 15, and demodulates the corresponding modulation method in each of the m transmitters 12. Decoding processing is performed, each data transmitted from the m transmitters 12 is restored, and the data is transmitted to the receiving device 17 together with the TMCC information (TMCC ₁ , TMCC ₂ , ..., TMCC _m ).

In this example, the receiving device 17 has the information bit rate transmitted from the m transmitters 12 based on the TMCC information (TMCC ₁ , TMCC ₂ , ..., TMCC _m ) obtained from the m receivers 16. For each data of I ₁ , I ₂ , ..., _Im , the division frame described later is reconstructed with reference to FIG. Further, when the receiving device 17 has a part of the distributed data (data of the information bit rate In) transmitted from the transmitting device 11 via the IP network 19, the receiving device 17 also _receives the data, and FIG. 4 shows. Reconstruct the split frame that will be referred to and described later.

Then, the receiving device 17 receives all of the divided data (data of information bit rates I ₁ , I ₂ , ..., In) transmitted via the _m receivers 16 and the IP network 19 and re-receives them. The valid data of each basic division slot in the configured division frame is connected in ascending order of each basic division slot, and a large amount of data (transmitted at an information bit rate I _all ) in the same signal format as that transmitted from the signal source device 10 is transmitted. (Data equivalent to the data obtained) is restored, and the transmission interval of each restored IP packet is adjusted from the restored IP packet length and the divided frame length described later with reference to FIG. 4 (FIGS. 12 to 12). It will be described later with reference to FIG. 16), and an output signal suitable for the display device 18 is generated and output to the display device 18.

The display device 18 reproduces a large amount of data transmitted from the signal source device 10 via the receiving device 17. Instead of the display device 18, a recording device for recording a large amount of data on a recording medium may be used.

Further, the connection between the transmitter 11 and the signal source device 10 and between the transmitter 11 and the m transmitters 12 may be a direct communication mode by a dedicated line, or an IP-based local area. It may be connected via a network. Similarly, the connection between the receiving device 11 and the display device 18 and between the receiving device 11 and the m receivers 16 may be a direct communication form by a dedicated line, or may be an IP-based local area. It may be connected via a network.

Hereinafter, the transmission device 11 of the embodiment according to the present invention will be described in more detail.

(Transmitter)
FIG. 2 is a block diagram showing a schematic configuration of a transmission device 11 according to an embodiment of the present invention. The transmission device 11 includes a TLV signal generation unit 111, a division frame generation unit 112, and an IP encapsulation unit 113.

The TLV signal generation unit 111 inputs a large amount of data (including video and audio) having an information bit rate I _all from the signal source device 10, and signals in the TLV packet format (for example, ARIB STD-B32, Volume 3). , P.20, 3.5, see TLV packet) and output to the split frame generation unit 112.

For example, an example will be described in which the signal source device 10 transmits an IP-based variable-length signal (hereinafter referred to as “IP signal”) to the TLV signal generation unit 111 as a large-capacity data of the information bit rate I _all . Such an IP signal may be, for example, an IP packet stored in an Ethernet (registered trademark) frame.

When the TLV signal generation unit 111 is input in the form of an IP signal, the TLV signal generation unit 111 determines the packet length of the variable length IP packet obtained from the signal source device 10, and conforms to the signal in the TLV packet format as shown in FIG. A 4-byte long TLV header is generated and added to the TLV packet payload part. Normally, the TLV header is composed of a packet type field (1 byte indicating "0x7F" and 1 byte indicating a type (Type)) and 2 bytes indicating a packet length field (length).

Here, although FIG. 3 shows an example of conversion so that the IP packet is stored in the TLV packet payload, the TLV signal generation unit 111 acquires information from the signal source device 10 to store the IP packet in the TLV packet payload. The large-capacity data of the bit rate I _all may be stored in an Ethernet (registered trademark) frame, may be in the form of an IP packet, or may be RAW data such as pure video and audio. The TLV signal generation unit 111 converts a large amount of data acquired from the signal source device 10 in an arbitrary signal format (if it has a header, it is stored as it is as shown in FIG. 3) into a TLV signal to which a TLV header is added. By doing so, it becomes possible to limit the input signal of the divided frame generation unit 112, which will be described later, to a signal in the TLV packet format.

For example, a large amount of data having an information bit rate of I _all is configured as an IP packet as shown in FIG. 3, and in the IP packet, in addition to the IP header and the IP packet payload, other header information (for example, UDP (for example) A User Datagram Protocol) header, etc.) may be added, and the IP packet payload may consist of an MMT signal constituting an MMTP packet composed of an MMTP header and an MMTP packet payload. As described above, if the large amount of data having the information bit rate I _all has a header, it is stored as it is in the TLV packet payload as shown in FIG. As a result, even after passing through the transmission system 1, it is possible to obtain a high affinity without adversely affecting the IP-based signal transmission.

By the way, as described below, the transmission device 11 according to the present invention is provided with the divided frame generation unit 112, which not only has a high affinity for IP-based signal transmission, but also has an ISDB-S3 format frame. The affinity with the structure is also improved.

The division frame generation unit 112 constitutes a division frame (see FIG. 4) for adjusting the information bit rate related to the distribution to the m transmitters 12, and is based on the division frame from the TLV signal generation unit 111. The input TLV signal is divided into the following m transmitters 12, and when the TLV signal has an information bit rate I _all exceeding the maximum transmission rate that can be transmitted by the m transmitters 12, it is also sent to the IP network 19. Divide and distribute.

The transmitter 11 determines in advance m transmitters 12 to be used as a satellite transmission path when transmitting a large amount of data acquired from the signal source device 10, and is set by each of the m transmitters 12. Since the maximum value that can be transmitted is determined by the modulation method and LDPC coding rate, TMCC information (TMCC ₁ , TMCC ₂ , ...,) that specifies the modulation method and LDPC coding rate from each of the m transmitters 12 is determined. By acquiring TMCC _m ), the information bit rates I ₁ , I ₂ , ..., _Im can be determined. When the _m transmitters 12 are predetermined to use a fixed coding modulation method, the information bit rates I ₁ , I ₂ , ..., Im are determined without acquiring TMCC information. be able to. With respect to the remaining data exceeding the maximum transmission rate that can be transmitted by the _m transmitters 12, a large amount of data acquired from the signal source device 10 is distributed to the IP network 19 at the information bit rate In.

As shown in FIG. 4, in the divided frame generated by the divided frame generation unit 112, the horizontal width corresponds to the frame length and the vertical width corresponds to the number of divided slots, and the divided frame is composed of a plurality of basic divided slots. The frame length of each basic division slot corresponds to the transmission frame length (120 slots of ISDB-S3) of the transmission method of the broadcast transmission line (ISDB-S3 in this example), and the frame length of each basic division slot corresponds to that of the broadcast transmission line. Coding and modulation method at the maximum transmission rate supported by the transmission method of the broadcast transmission line (ISDB-S3 in this example), which can be easily synchronized with the transmission method (synchronized with the transmission frame 120 slot of ISDB-S3). (In the example of ISDB-S3, 32APSK (LDPC coding rate: 9/10)) is set to be accommodated. That is, when the m transmitters 12 are compliant with ISDB-S3, the transmission frame length of each basic division slot is set to 120 × 40392 bits = 4847040 bits (605880 bytes).

Then, in the TLV signal input to the division frame generation unit 112, the 4-byte TLV header and the variable-length TLV packet payload are sequentially accommodated from the basic division slot # 1 to the basic division slot # n in ascending order. Here, the TLV signal in the basic division slot # 1 is for the transmitter 12-1, the TLV signal in the basic division slot # 2 is for the transmitter 12-2, and the TLV signal in the basic division slot # m is. Is for the transmitter 12-m, and the TLV signal in the basic division slot #n is for transmission via the IP network 19.

In addition, "0x7F" of the first byte of the TLV header in each TLV packet constituting the TLV signal in each basic division slot is used as a pattern for determining the head position of the TLV packet in the broadcast transmission line.

Therefore, the TLV packet (head TLV packet) arranged at the head of each basic division slot clearly indicates the head position of the TLV signal in the basic division slot, as shown in FIG. FIG. 5 is a configuration diagram of a head TLV packet related to a divided frame used in the transmitting device 11 of the embodiment according to the present invention. As a packet type field at the head position of the basic division slot, an identification pattern (that is, identification) indicating the head TLV packet of each basic division slot in each division frame from "0x04-0xFD" which is an undefined area in the existing TLV signal format. Information) is set. Therefore, the head TLV packet shown in FIGS. 4 and 5 has a packet type field value different from that of the other TLV packets set by default, and the TLV indicating the head of any basic split slot in any split frame. The receiving device 17 can identify whether it is a packet or not.

In particular, the division frame generation unit 112 in the transmission device 11 of the present embodiment uniquely indicates the signal order of the division frames in each basic division slot constituting the division frame for each stream to be transmitted. Has the means to grant. That is, when the divided frame generation unit 112 bulk-transmits as a plurality of streams from the transmission device 11, the signal order of the divided frames is uniquely specified in each basic divided slot constituting the divided frame for each stream. The identification information for the purpose is given.

FIG. 6 shows a packet in the head TLV packet as identification information for uniquely specifying the signal order of the divided frames in each basic divided slot constituting the divided frame in the transmitting device 11 of the embodiment according to the present invention. It is a figure which shows the example of giving the numerical value of a type field increment within a predetermined range. As shown in FIG. 6, the division frame generation unit 112 assigns the numerical value of the packet type field in the head TLV packet of each basic division slot by incrementing from "0x04" (initial value), and assigns "0x04"-"0xFD". The identification information is assigned to each basic division slot by repeating the increment within the range of. Then, when the split frame generation unit 112 bulk-transmits as a plurality of streams from the transmission device 11, the numerical value of the packet type field in the head TLV packet of each basic split slot is set to "0x04" (initially) for each stream. The value) is incremented and assigned, and the increment is repeated within the range of "0x04"-"0xFD" to assign the identification information to each basic division slot.

More specifically, in the leftmost division frame shown in FIG. 6, when "0x04" is assigned to the packet type field in the head TLV packet of each basic division slot, "0x05" is assigned to the next division frame. , "0x06" is similarly given to the next divided frame. That is, a value incremented by 1 is added to the packet type field in the head TLV packet for each divided frame, and "0x04" is added to the next divided frame of the divided frame to which "0xFD" is added. And repeat. As a result, even when the reception order of the divided frames in the receiving device 17 is replaced with the transmission order on the transmitting device 11 side, the context between the basic divided frames can be identified. Further, on the receiving device 17 side, the divided frames can be rearranged in the correct order, and the divided frames can be associated with the basic divided slot.

As shown in FIG. 4, each basic division slot is null from the back of each basic division slot in order to fill the remaining area where the information bit rate is adjusted based on the TMCC information acquired from m transmitters 12. (Null) is inserted. This null may be a variable-length null TLV packet (variable-length packet with "0xFF" as the basic unit) in order to clarify the unit of each TLV packet in the divided frame, but it is actually transmitted on the broadcast transmission path. Not done.

There are 55 types of combinations of modulation method and LDPC coding rate supported by ISDB-S3, and the combination is not limited, but for example, a single modulation method / LDPC code coding modulation is used for all m transmitters 12. When it is determined that the data is transmitted by the method, as shown in FIG. 7, the null length is also 55 types. FIG. 7 shows the modulation method, LDPC coding rate, payload size of the basic division slot, and the length of the null TLV packet to be inserted of each transmitter (example: ISDB-S3) controlled by the transmitter of one embodiment according to the present invention. It is a figure which illustrates the relationship.

Further, as can be understood from FIG. 4, when the data is divided and transmitted via the communication transmission line (IP network 19), the data is divided and transmitted on the broadcast transmission line in one divided frame. It constitutes a basic division slot having the first TLV packet. Therefore, each divided frame can be reconstructed by each head TLV packet on the receiving device 17 side without separately providing a frame header for one divided frame, and the broadcast transmission line and the communication transmission line can be reconstructed. It has a high affinity for all of them and has high transmission efficiency.

In this way, in the example shown in FIG. 2, the division frame generation unit 112 adjusts the information bit rate related to the distribution to the m transmitters 12 in a timely manner based on the TMCC information (see FIG. 4). Is configured, and the TLV signal input from the TLV signal generation unit 111 is divided into the following m transmitters 12 based on this division frame, and the maximum TLV signal can be transmitted by the m transmitters 12. When the information bit rate I _all exceeds the transmission rate, it is also divided and distributed to the IP network 19.

Then, since the divided frame generation unit 112 operates to distribute a large amount of data in units of divided frames to the transmitters 12 and the IP network 19 in m units, it is stabilized when the divided frame generation unit 112 is operated in clock synchronization, and m. Since the payload size that can be accommodated by the transmission frame (in this example, the transmission frame of ISDB-S3) in each of the transmitters 12 matches the payload size of the basic division slot, it can be easily connected to the m transmitters 12. It will be possible.
Further, since the size of the basic division slot matches the transmission frame of ISDB-S3, the information bit rate in the receiving device 17 can be easily managed.

Further, even if the coding modulation method in each of the m transmitters 12 is different and variable, the divided frame generator 112 responds based on the TMCC information acquired from each of the m transmitters 12. Since the payload size of each basic division slot can be set, it is possible to control the information bit rate for each of the m transmitters 12 to be constant. In other words, the information bit rate of the basic division slot is determined based on the TMCC information of each of the m transmitters 12.

As an example, FIG. 8 is a configuration example of a basic division slot when 16APSK (LDPC coding rate: 7/9) is fixed as a coding modulation method supported by the transmitter 12-1 (eg ISDB-S3). In the example shown in FIG. 8, it is possible to transmit 99.9552 Mbps per basic division slot. Since the null (or null TLV packet) in the basic division slot is a padding function for facilitating the connection between the transmitter 11 and the transmitter 12-1 and the clock synchronization management, the transmitter is used. It is not actually transmitted from 12-1 on the broadcast transmission line.

As shown in FIG. 2, when the divided frame generation unit 112 makes the number of data distributed to the m transmitters 12 and the IP network 19 variable according to the TMCC information (that is, constitutes one divided frame). (When the total number of basic division slots to be used is variable), information on the number of slot divisions (n in this example) and the unique number (1 to m in this example) indicating the basic division slots corresponding to each transmitter 12. , Notifying each of the m transmitters 12, and using the TMCC information (TMCC ₁ , TMCC ₂ , ..., TMCC _m ) in each of the m transmitters 12 from the m transmitters 12 to the receiver 17 It is preferable to configure it so that it is transmitted toward. As a result, the receiving device 17, which will be described in detail later, can easily reconstruct the partition frame.

The information on the number of slot divisions notified to all of the m transmitters 12 to be used corresponds to the information on the total number of basic division slots (n) in the division frame shown in FIG. The unique number (1 to m in this example) indicating the basic division slot notified to each of the m transmitters 12 corresponds to the unique number for identifying each basic division slot shown in FIG.

In the example shown in FIG. 2, the division frame generation unit 112 provides information on the number of slot divisions (n in this example) and the unique number (1 to m in this example) indicating the basic division slot corresponding to each transmitter 12. Notify by embedding in the extended area of TMCC information acquired from each of the m transmitters 12 and replying. ISDB-S3 can use 3614 bits as an extension area for TMCC information, and has a sufficient free area for independently transmitting information on the number of slot divisions and the unique number of the basic division slot. However, the information on the number of slot divisions and the unique number of the basic division slot may be notified from the division frame generator 112 to each of the m transmitters 12 via the local area network, or in each basic division slot. It may be embedded.

For example, when it is specified to transmit data in the MMT signal format in the TLV packet payload as shown in FIG. 3, information on the number of slot divisions and the unique number of the basic division slot may be embedded in the MMTP header. In the case of MMT, an expansion area is secured in the MMTP header, and it is also possible to notify the information of the number of slot divisions and the unique number of the basic division slot by using them. In this way, when it is stipulated to store a signal format having unique header information such as MMT, the free area of the header information is used for notification. In addition, since it is difficult to assume that the number of slot divisions will be changed frequently, information on the number of slot divisions scheduled at the transmission time and the information on the unique number of the basic division slot for unique information such as the frequency allocation of each transmitter 12 is transmitted (transmitted). It is also possible to predetermine and make known between the device 11 and the receiving device 17), or to notify the receiving device 17 in advance from the transmitting device 11 before transmitting the large-capacity data.

When the IP encapsulation unit 113 shown in FIG. 2 distributes and transmits a large amount of data acquired from the signal source device 10 at an information bit rate In, the IPv4 or the TLV signal in the basic division slot _#n shown in FIG. 4 is divided and transmitted. Header information according to Internet protocols such as IPv6 is added, IP encapsulation is applied to form IP-based signals (IP packets, Ethernet (registered trademark) frames, etc.), output to IP network 19, and received via IP network 19. It is transmitted to the device 17.

In particular, when the division frame configured by the division frame generation unit 112 includes a predetermined number of basic division slots for transmission via the communication transmission path of the IP network 19, the IP encapsulation unit 113 includes the predetermined number of basic divisions. The slot is divided into IP-based packets that match the IP network 19, and each divided IP-based packet is given an IP sequence number to uniquely indicate the signal order of the packet and is received. It has means for transmitting to the device 17.

FIG. 9 shows an IP assigned for divided transmission of an IP-based packet when the transmission device 11 of the embodiment according to the present invention includes a basic divided slot that utilizes transmission via an IP network in the divided frame. It is a figure which shows the packet structure including a sequence number. As shown in FIG. 9, the IP encapsulation unit 113 assigns a 16-bit IP sequence number (IPSN) to the IP payload area because IP-based packet replacement (reordering) occurs on the IP network. Then, it is transmitted to the receiving device 17. By using this IP sequence number on the receiving device 17 side, the receiving device 17 can sort the replaced IP-based packets in an appropriate order.

The receiving device 17 sorts the received IP-based signals in order based on the header information, and then extracts the TLV signal in the basic division slot #n shown in FIG. However, as described above, when the transmitting device 11 transmits data from the signal source device 10 to the receiving device 17 with an information bit rate I _all exceeding the maximum transmission rate that can be transmitted by the m transmitters 12. Only use transmission to IP network 19. The basic division slot #n shown in FIG. 4 is not limited to one slot, but may be a plurality of slots. However, in this embodiment, since a broadcast transmission line having high transmission time stability is mainly used, one slot is used. It is a minute. Further, when the large-capacity data is divided and transmitted from the transmitting device 11 to the receiving device 17 using the broadcasting transmission line and the communication transmission line, the divided slot is reconfigured on the receiving device 17 side (TLV in each basic divided slot). From the viewpoint of ease of packet concatenation), the size is the same as the size of the basic division slot for transmission by m transmitters 12.

FIG. 10 shows a frame division number of 5 (4 transmitters (broadcast transmission line)) when 16 APSK (LDPC coding rate: 7/9) is fixed as a coding modulation method supported by each transmitter (example: ISDB-S3). ) And a basic division slot for one IP network (communication transmission line)). In the example shown in FIG. 10, the transmitter 11 is connected to four transmitters 12 with m = 4, and all four transmitters 12 are set to 16APSK (LDPC coding rate: 7/9). Further, in the configuration example of the basic division slot when the same basic transmission slot as 16APSK (LDPC coding rate: 7/9) is applied for IP network 19 distribution and it is set as the nth slot (n = 5). be. In this case, the number of slot divisions is 5, and the unique numbers of the basic division slots are # 1 to # 5.

As described above, the transmitter 11 of the embodiment shown in FIG. 2 has a unique number (m in this example) indicating the number of slot divisions (5) and the basic division slot corresponding to each transmitter 12 by the division frame generation unit 112. = Notify each of the m transmitters 12 about the information of 1 to 4), and use the TMCC information (TMCC ₁ , TMCC ₂ , ..., TMCC _m ) in each of the m transmitters 12 to m units. It is preferable to configure the transmission from the transmitter 12 to the receiving device 17. Therefore, the receiving device 17 of the embodiment according to the present invention corresponding to the transmitting device 11 shown in FIG. 2 will be described in detail below.

(Receiver)
FIG. 11 is a block diagram showing a schematic configuration of a receiving device 17 according to an embodiment of the present invention. The receiving device 17 includes a divided frame reconstructing unit 171, an IP decapsulating unit 172, an output signal generation unit 173, and a transmission interval adjusting unit 174.

The split frame reconstruction unit 171 has a split frame structure (basic) based on TMCC information (TMCC ₁ , TMCC ₂ , ..., TMCC _m ) obtained from m receivers 16 corresponding to m transmitters 12. The number of slot divisions of the division slot, etc.) is identified, and the head TLV packets constituting each basic division slot are discriminated and sorted based on the setting information in the TLV header, and transmitted from the m transmitters 12 concerned. A null (or null TLV packet) is inserted behind each basic division _slot for each data of the information bit rate I ₁ , I ₂ , ..., Im to be performed, and the division frame described above with reference to FIG. 4 is inserted. Reconstruct. In this example, the information of the number of slot divisions for reconstructing the division frame shown in FIG. 4 and the unique number indicating the basic division slot corresponding to each transmitter 12 is the TMCC information (TMCC ₁ , TMCC ₂ , ... , TMCC _m ) is used for transmission. However, when the coding modulation method used in a plurality of broadcasting transmission lines is known in advance, and when the number of data distributed to the m transmitters 12 and the IP network 19 is not variable and fixed, or between transmission and reception. When scheduled or notified in advance as known in advance, the divided frame reconstructing unit 171 does not need to refer to the TMCC information (TMCC ₁ , TMCC ₂ , ..., TMCC _m ) and has a fixed frame length in advance. A split frame can be reconstructed.

That is, the division frame reconstruction unit 171 determines the head TLV packet shown in FIG. 5 described above by the setting in the TLV header, and the identification information for uniquely clearly indicating the signal order of the division frame (in the above embodiment). , By the numerical value of the packet type field in the head TLV packet), it is possible to distinguish from other TLV headers and grasp the head position of each basic split slot and the appropriate signal order between split frames. .. Then, the division frame reconstruction unit 171 corresponds to each basic division slot from the information of the number of slot divisions for reconstructing the division frame shown in FIG. 4 and the information of the unique number indicating the basic division slot corresponding to each transmitter 12. The division frame shown in FIG. 4 is reconstructed by determining the TLV packet arrangement based on the information bit rate to be performed and inserting a predetermined amount of nulls (or null TLV packets) behind each basic division slot. As a result, the processing speed between each basic division slot in each division frame is constant by accurately restoring the division frame using nulls (or null TLV packets) that are not actually transmitted in the broadcast transmission line and the communication transmission line. It is possible to stabilize the processing and compensate for the transmission delay in the broadcast transmission line and the communication transmission line. Further, since the head position of each basic division slot can be grasped by the head TLV packet, each division frame is reconstructed by each head TLV packet on the receiving device 17 side without separately providing a frame header. It is possible to achieve a high affinity for both a broadcast transmission line and a communication transmission line, and the transmission efficiency is also high.

When there is some post-distributed data (data with an information bit rate In) transmitted from the transmission device 11 via the IP network 19, the IP _{decapsulation} unit 172 also receives the data as an IP-based packet. After IP decapsulation is performed and the signal order is arranged based on the IP sequence number for uniquely specifying the signal order given in the packet, the TLV signal in the basic division slot #n shown in FIG. 4 is used. It is extracted, the basic division slot #n is reconstructed, and it is output to the division frame reconstruction unit 171.

As a result, the divided frame reconstructing unit ₁₇₁ also receives a part of the distributed data (data with the information bit rate In) transmitted from the transmitting device 11 via the IP network 19. Based on the above-mentioned identification information (in the above-mentioned embodiment, the numerical value of the packet type field in the head TLV packet), the above-mentioned divided frames are rearranged so as to be reconstructed with reference to FIG.

The output signal generation unit 173 has a TLV header (first TLV header) for the data from the basic division slot # 1 to the basic division slot # n in the division frame reconstructed by the division frame reconstruction unit 171 in ascending order of each basic division slot. (Including) and concatenated after removing nulls (that is, concatenated for valid data), and a large amount of data in the same signal format as that transmitted from the signal source device 10 (transmitted at the information bit rate I _all ). (Data equivalent to the above) is restored, and an output signal suitable for the display device 18 is generated. As an output signal suitable for any output device such as the display device 18, it can be an output signal of an IP packet string in which IP packets extracted as valid data stored in each TLV payload are concatenated.

The transmission interval adjustment unit 174 adjusts the transmission interval of the large-capacity data (information bit rate I _all ) restored by the output signal generation unit 173, and outputs the data to the display device 18. Instead of the display device 18, a recording device for recording a large amount of data on a recording medium may be used. That is, the transmission interval adjusting unit 174 reduces the jitter (packet jitter when outputting as an IP packet string) at the time of external output of the large-capacity data (information bit rate _Iall ) restored by the output signal generation unit 173. , Adjust the transmission interval of the output signal to be output externally. As an embodiment, the transmission interval adjusting unit 174 receives the large amount of data (information bit rate I _all ) divided by the transmitting device 11 by the receiving device 17 and reconstructs it as an output signal of an IP packet string. When outputting to the outside, the transmission interval of each IP packet is calculated from the processing time corresponding to the information bit rate of the large amount of data (information bit rate I _all ) and each packet length of the IP packet string, and according to the transmission interval. By outputting each IP packet of the IP packet sequence, it is configured to have a means for suppressing variation in the transmission interval of the IP packet.

(Operation of transmission interval adjustment unit)
Hereinafter, the operation of the transmission interval adjusting unit 174 will be described in detail.

First, the basic division slot size is set to accommodate the coding rate / modulation method (32APSK (LDPC coding rate: 9/10)) at the maximum transmission rate supported by ISDB-S3, which is 120. × 40392 bits = 4847040 bits (605880 bytes). Further, since the maximum transmission rate _ISDB-S3 is 146.673452 Mbps by 32 APSK (LDPC coding rate: 9/10) when the symbol rate of ISDB-S3 is 33.7561 Mbaud, the processing time per basic division frame is T _ISDB . _-S3 is 33.406471 msec (= 4847040/146.673452 × 10 ^-3 ).

Therefore, FIG. 12 shows an operation of adjusting the transmission interval of a large amount of data in the transmission interval adjustment unit 174 for the example shown in FIG. In the example shown in FIG. 12, on the transmission device 11 side, the large-capacity data of the information bit rate I _all is divided into the data of the information bit rates I ₁ , I ₂ , ..., I ₅ , respectively, and the basic division slots # 1 to It will be distributed to # 5. Here, the processing times T ₁ , T ₂ , ..., T ₅ of each basic division slot are T _ISDB-S3 × I ₁ / I _ISDB-S3 , T _ISDB-S3 × I ₂ / I _ISDB-S3 , ... , T _ISDB-S3 x I ₅ / I _ISDB-S3 . That is, the transmission device 11 divides a large amount of data having an information bit rate I _all into information bit rates I ₁ , I ₂ , ..., I ₅ and T ₁ to T in each basic division slot # 1 to # 5. Process in ₅ hours.

Therefore, the receiving device 17 restores the large-capacity data divided by the transmitting device 11 by the divided frame reconstruction unit 171 and the output signal generation unit 173. Further, the receiving device 17 adjusts and outputs the transmitted interval of the restored large-capacity data in the _ISDB-S3 unit (processing time unit per basic division slot) by the transmission interval adjusting unit 174. Since the receiving device 17 reconstructs the valid data of each divided data (information bit rates I ₁ to I ₅ ) and outputs the data at the information bit rate I _all , the processing time T in the receiving device 17 is set. The processing time of each basic division slot in the transmission device 11 is the time obtained by compressing T ₁ , T ₂ , ..., T ₅ according to each information bit rate I ₁ , I ₂ , ..., I ₅ . The specific processing time T is T = T ₁ × I ₁ / I _all + T ₂ × I ₂ / I _all + T ₃ × I ₃ / I _all + T ₄ × I ₄ / I _all + T ₅ × I ₅ / I _all . Will be. The receiving device 17 can output the data at the information bit rate I _all by outputting the large-capacity data restored by the output signal generation unit 173 during the processing time T.

When the number of TLV packet payloads in the processing time T of the TLV packet payload, which is a large amount of data, is n, each TLV packet payload is P1, P2, ..., Pn, and their payload lengths are L1, L2, ..., Ln. This payload length can be obtained from the packet length field (length) information of the TLV header added by the transmission device 11. In each TLV packet payload, an IP packet as illustrated in FIG. 9 is stored as valid data of the TLV packet. Therefore, the payload length of the TLV packet payload can be processed as the packet length of the IP packet. At this time, the transmission interval adjusting unit 174 calculates the transmission interval of the TLV packet payload (that is, the IP packet) from the TLV packet payload length (that is, the packet length of the IP packet) and the processing time T. The transmission interval Interval (i) of the i-th and i + 1th TLV packet payloads (that is, IP packets) obtained by the transmission time adjustment unit 174 is the processing time of each TLV packet payload, and the processing time T is the processing time of each TLV packet. The time is allocated according to the payload length and is expressed as in Eq. (2).

Therefore, the transmission time adjustment unit 174 can suppress the variation in the transmission interval of the IP packet and reduce the packet jitter by outputting the TLV packet payload (that is, the IP packet) according to this Interval (i). Become.

As will be described with reference to FIGS. 13 to 16, the transmission interval of the output signal (IP packet string in this example) by the transmission time adjustment unit 174 in the reception device 17 is adjusted from the transmission device 11 to the reception device 17. It is possible to operate in the same manner in both the case where one stream requiring transmission at the information bit rate I _all is divided at an evenly divided rate and the case where one stream is divided at an unequally divided rate. Further, the adjustment of the transmission interval of the output signal (IP packet string in this example) by the transmission time adjustment unit 174 in the receiving device 17 divides a plurality of streams requiring transmission at the information bit rate I _all into equal division rates. It can be operated in the same manner in both the case of doing and the case of dividing at a non-equal division rate.

(Example of 1-stream equal division rate)
FIG. 13 is a diagram for explaining an operation example of one stream equal division rate as the operation of the transmission device 11 and the reception device 17 according to the embodiment of the present invention. In the example shown in FIG. 13, as one stream requiring transmission at the information bit rate I _all , a 240 [Mbps] 8K / 120P video signal is bulk transmitted using a TLV packet to two broadcast transmission lines ( An example is shown in which S1, S2) and one communication transmission line (IP) are divided into equal division rates of 80 [Mbps] (excluding α for the TLV header) for transmission.
Then, the total number of bits Pall received as valid data (TLV packet payload) of the TLV packet on the receiving device 17 side is given by 80 [ _Mbps ] × T [msec] × 3. When the number of TLV packet payloads in the processing time T is n, each TLV packet payload is P1, P2, ..., Pn, their payload lengths are L1, L2, ..., Ln, and the information of each payload length is the TLV header H1. , H2, ..., Hk, ..., Hm, ..., Hn.
The processing time T in the receiving device 17 corresponding to the 80 [Mbps] is about 18.025 [msec] (compressed time excluding α for the TLV header), and when the receiving device 17 outputs to the outside, the processing time T is about 18.025 [msec]. If _Pall [bit] is sent in the total processing time T [msec], it becomes 240 [Mbps]. Therefore, the receiving device 17 can reduce the jitter of the output signal by transmitting _All [bit] according to the i-th and i + 1th transmission intervals S (i) so as to satisfy this. The transmission interval S (i) can be calculated in the same manner as the Interval (i) in the equation (2).

(Example of 1-stream unequal rate)
FIG. 14 is a diagram for explaining an operation example of one stream unequal rate as the operation of the transmission device 11 and the reception device 17 of the embodiment according to the present invention. In the example shown in FIG. 14, as one stream requiring transmission at the information bit rate _Iall , a 240 [Mbps] 8K / 120P video signal is bulk transmitted using a TLV packet to two broadcast transmission lines ( An example is shown in which S1, S2) and one communication transmission line (IP) are divided into unequally divided rates of 120, 80, 40 [Mbps] (excluding α for the TLV header) and transmitted. ..
The processing time T _s1 corresponding to 120 [Mbps] is about 27.039 [msec] (compression time excluding α for the TLV header), and the processing time T _s2 corresponding to 80 [Mbps] is about 18. It is .025 [msec] (compressed time excluding TLV header), and the processing time TIP corresponding to 40 [Mbps] is about _9.012 [msec] (compressed time excluding TLV header). .. The total processing time T [msec] in the receiving device 17 is α for the TLV header according to each information bit rate (transmission rate) of the processing times T _s1 , T _s2 , and T _IP of each basic division slot in the transmitting device 11. It is the compressed time excluding. When the number of TLV packet payloads in the processing time T is n, each TLV packet payload is P1, P2, ..., Pk, ..., Pm, ..., Pn, and their payload lengths are L1, L2, ..., Lk, ..., Lm. , ..., Ln, and the information of each payload length is stored in the TLV headers H1, H2, ..., Hk, ..., Hm, ..., Hn.
The total number of bits _{Pall received as valid data (TLV packet payload) of the TLV packet on the receiving device 17 side is 120 [Mbps] × T s1 [} msec] + 80 [Mbps] × T _s2 [msec] + 40 [Mbps]. ] × T _IP [msec]. When the receiving device 17 outputs this _Pall to the outside, if the _Pall [bit] is sent by T [msec], it becomes 240 [Mbps]. Therefore, the receiving device 17 can reduce the jitter of the output signal by transmitting _All [bit] according to the transmission interval Interval (i) in the i-th and i + 1-th equations (2) so as to satisfy this.

(Generalized example of 1-stream unequal rate)
FIG. 15 is a diagram for generalizing and explaining the operation of one stream unequal rate as the operation of the transmitting device 11 and the receiving device 17 according to the embodiment of the present invention. FIG. 15 is a generalized view of the example shown in FIG. 14, in which a signal of a predetermined data is transmitted by bulk transmission using a TLV packet as one stream requiring transmission at an information bit rate _Header , and two systems are used. An example in which the broadcast transmission line (S1, S2) and one communication transmission line (IP) are divided into unequal rates of A, B, C [Mbps] (excluding α for the TLV header) and transmitted. Is shown.
Since the maximum transmission rate I _ISDB-S3 is 146.673452 Mbps by 32 APSK (LDPC coding rate: 9/10) when the symbol rate of ISDB-S3 is 33.7561 Mbaud, the processing time per basic division frame T _ISDB-S3 . Is 33.406471 msec (= 4847040/146.673452 × 10 ^-3 ). Therefore, the processing time T _s1 corresponding to A [Mbps] is A / I _ISDB-S3 × T _ISDB-S3 , and the processing time T _s2 corresponding to B [Mbps] is B / I _ISDB-S3 ×. It is T _ISDB-S3 , and the processing time T _IP corresponding to C [Mbps] is C / I _ISDB-S3 × T _ISDB-S3 . The total processing time T [msec] in the receiving device 17 is α for the TLV header according to each information bit rate (transmission rate) of the processing times T _s1 , T _s2 , and T _IP of each basic division slot in the transmitting device 11. It is the compressed time excluding.
Then, the total number of bits _{Pall received as valid data (TLV packet payload) of the TLV packet on the receiving device 17 side is given by A × T s1 +} B × T _s2 + C × T _IP . When the receiving device 17 outputs this _{Pall to the outside, if the Pall [bit] is sent by T [msec], it becomes I all [ Mbps} ]. Therefore, the receiving device 17 can reduce the jitter of the output signal by transmitting _All [bit] according to the transmission interval Interval (i) in the i-th and i + 1-th equations (2) so as to satisfy this.

(Application example: Example of 2-stream unequal division rate)
FIG. 16 is a diagram for explaining an operation example of a two-stream unequal rate as an application example of the operation of the transmission device 11 and the reception device 17 according to the present invention. In the example shown in FIG. 16, as two streams requiring transmission at the information bit rate I _all , an 8K / 60P video signal of 100 [Mbps] is transmitted in bulk using a TLV packet at 60, 40 [Mbps], respectively. 1 system of communication transmission line (IP) of 40 [Mbps] (≦ 100 [Mbps]) for the first stream to be divided and transmitted by the two broadcast transmission lines (S1 and S2) of An example of parallel transmission of the second stream to be transmitted in is shown. When bulk transmission is performed as a plurality of streams, the transmission device 11 assigns identification information for uniquely specifying the signal order of the divided frames in each basic divided slot constituting the divided frame for each stream. ing.
The total processing time T [msec] of the first stream in the receiving device 17 is the processing time T _s1 and T _s2 (not shown) of each basic division slot in the transmitting device 11 at each information bit rate, as described above. It is the compressed time excluding α for the TLV header according to (transmission rate), and similarly, the total processing time T'[msec] of the second stream is the processing time _TIP of the basic division slot in the transmission device 11. It is the time obtained by compressing (not shown) according to the information bit rate (transmission rate) excluding α for the TLV header. For convenience of explanation, each TLV packet payload related to the first stream is P1, P2, ..., Pk, ..., Pm, ..., Pn, and their payload lengths are L1, L2, ..., Lk, ..., Lm, ..., Ln. , Information on each payload length is stored in the TLV headers H1, H2, ..., Hk, ..., Hm, ..., Hn. Similarly, each TLV packet payload for the second stream is P1', P2', ..., Pk', ..., Pm', ..., Pn', and their payload lengths are L1', L2', ..., Lk', ... , Lm', ..., Ln', and the information of each payload length is stored in the TLV headers H1', H2', ..., Hk', ..., Hm', ..., Hn'.
Therefore, similarly to the above, when the receiving device 17 externally outputs the output signal related to the first stream, 100 if the total number of bits related to the first stream _Pall [bit] is transmitted by T [msec]. It becomes [Mbps], and if the total number of bits _Pall '[bit] related to the second stream is transmitted in parallel with this second stream, it becomes 40 [Mbps]. Therefore, if the receiving device 17 transmits the total number of bits _Pall [bit] related to the first stream according to the transmission interval Interval (i) in the i-th and i + 1-th equations (2) so as to satisfy this, the first The jitter of the output signal related to one stream can be reduced, and the total number of bits _Pall '[bit] related to the second stream is transmitted according to the transmission interval Interval'(i) given in the same manner as in the equation (2). Then, the jitter of the output signal related to the second stream can be reduced.

As described above, the adjustment of the transmission interval of the output signal by the transmission time adjusting unit 174 in the receiving device 17 requires transmission at the information bit rate _Iall from the transmitting device 11 to the receiving device 17. In either case, the jitter of the output signal can be reduced in any case where the transmission is divided and transmitted at equal or non-equal division rates.

As described above, the transmission system 1 including the transmission device 11 and the reception device 17 according to the present invention is configured to divide and bulk-transmit a large amount of data in the TLV packet format. Then, the transmission device 11 determines a divided frame having a frame length based on a transmission method common to a plurality of broadcast transmission lines used for the bulk transmission. In particular, when the information bit rate required for transmission of the large-capacity data falls within the maximum transmission rate of the plurality of broadcast transmission lines, the transmission device 11 has the number of basic division slots corresponding to the plurality of broadcast transmission lines. When the information bit rate required for the transmission of the large-capacity data exceeds the maximum transmission rate that can be transmitted by the plurality of broadcast transmission lines, a predetermined frame is formed and the data is further transmitted via the communication transmission line of the IP network 19. A number of basic division slots are added to form the division frame. Then, the transmission device 11 divides and transmits the large-capacity data converted into the TLV packet format signal based on the divided frame, and each transmitter 12 in the plurality of broadcast transmission lines and the communication transmission line (the communication transmission line). It controls the connection to the IP network 19). Further, the transmission device 11 uniquely indicates the signal order of the division frames in each basic division slot constituting the division frame for each stream to be transmitted (in the first TLV packet in the above embodiment). (Depending on the numerical value of the packet type field of) is added. This stabilizes the information bit rate related to the transmission of the large-capacity data, facilitates and stabilizes the data transmission synchronization between the transmitting device 11 and the receiving device 17, and connects to the broadcast transmission line and the communication transmission line to be used. Ease (easiness of synchronization of connection timing) can be improved, and the receiving device 17 can appropriately return the signal order to the original order even when the signal order is changed such as reordering. .. In particular, when the transmission method of the broadcast transmission line is the ISDB-S3 method, the basic division slot constituting the division frame has a frame length corresponding to 120 slots of ISDB-S3.

Further, the transmission device 11 according to the present invention distinguishes the head TLV packet indicating the head TLV packet from the other TLV packets in each basic split slot for each basic split slot constituting the split frame. The division frame is configured so that the receiving device 17 can identify which division frame is the TLV packet indicating the head of which basic division slot, which is determined by the setting in the TLV header. Then, in the receiving device 17 according to the present invention, the head TLV packet is determined based on the setting information in the TLV header among the TLV packet format signals received via the plurality of broadcasting transmission lines and the communication transmission line. Then, in which division frame, the TLV packet indicating the head of which basic division slot is identified, and the division frame is reconstructed. As a result, each divided frame can be reconstructed by each head TLV packet on the receiving device 17 side without separately providing a frame header, and has an affinity for both a broadcast transmission line and a communication transmission line. In a high aspect, the transmission efficiency is also high.

Further, when the transmitting device 11 and the receiving device 17 according to the present invention configure or reconstruct the divided frame, the corresponding information bit rate is calculated based on the coding modulation method of each of the plurality of broadcasting transmission lines. Then, a null is inserted after the data allocated according to the information bit rate in each broadcast transmission line so that the frame length of the division frame constituting each basic division slot becomes a constant value for the plurality of broadcast transmission lines. The basic division slot for the communication transmission line is formed in accordance with the basic division slot for the plurality of broadcast transmission lines. The coding modulation method of each of the plurality of broadcast transmission lines can be configured to be grasped from the TMCC information used for the transmission control of each of the plurality of broadcast transmission lines. As a result, for example, when the transmission method used for the broadcast transmission line is ISDB-S3, there are 55 types of coded modulation methods, and if it is a conventional technique, the 55 types of coded modulation methods are used when dividing data. However, in the transmitting device 11 and the receiving device 17 according to the present invention, it is no longer necessary to perform such independent clock synchronization control, and each basic division in each division frame is eliminated. It is possible to keep the processing speed between slots constant and stabilize the processing, and it is possible to compensate for the transmission delay in the broadcasting transmission line and the communication transmission line.

Further, the receiving device 17 according to the present invention is a receiving device 17 of the output signal to be externally output in order to reduce jitter at the time of external output of predetermined data (large capacity data divided by the transmitting device 11) received and reconstructed. It has a means for adjusting the transmission interval. As a specific embodiment, when the receiving device 17 receives the predetermined data divided by the transmitting device 11, reconstructs it as an output signal of an IP packet string, and outputs it to the outside, the information bit rate of the predetermined data The transmission interval of each IP packet is calculated from the processing time corresponding to the above and each IP packet length of the IP packet string, and each packet of the IP packet string is output according to the transmission interval. This makes it possible to suppress variations in the transmission interval of IP packets and reduce packet jitter.

Further, the transmission device 11 according to the present invention makes it possible to change the number of slot divisions of the basic division slots constituting the division frame when the large-capacity data is divided and bulk-transmitted in the TLV packet format to form the division frame. It has means for notifying the receiving device 17 of information on the number of slot divisions of the basic division slots and the unique number of each basic division slot. Since it is difficult to assume that the number of slot divisions will be changed frequently, the number of slot divisions scheduled at the transmission time and the information of the unique number of the basic division slot are transmitted / received (transmitted) for the unique information such as the frequency allocation of each transmitter 12. Although it is possible to predetermine and make known between the device 11 and the receiving device 17), it is effective to notify the receiving device 17 in advance from the transmitting device 11 before transmitting the large-capacity data.

In addition, the transmission device 11 according to the present invention uses information on the number of slot divisions of the basic division slots constituting the division frame and the unique number of each basic division slot for the transmission control of each of the plurality of broadcast transmission lines. It is preferable to embed it inside and notify the receiving device 17. That is, the information can be embedded in each basic division slot or in the header information of a predetermined signal format (MMT or the like) stored in the TLV packet in each basic division slot, but TMCC information. It is more convenient to embed it inside and notify the receiving device 17.

Further, when the transmission device 11 according to the present invention includes a predetermined number of basic division slots for transmission via the communication transmission path of the IP network when configuring the division frame, the predetermined number of basic divisions are included. The slot is divided into IP-based packets consistent with the IP network 19, and an IP sequence number for uniquely specifying the signal order of the divided packets is assigned and transmitted to the receiving device 17. Then, when the receiving device 17 according to the present invention receives each of the divided IP-based packets relating to the predetermined number of basic divided slots transmitted via the communication transmission line of the IP network, the receiving device 17 decapsulates the packet. After arranging the signal order based on the IP sequence number for uniquely specifying the signal order given in the packet, the TLV signal is extracted and the predetermined number of basic division slots are reconstructed. As a result, the receiving device 17 can appropriately return the signal order to the original order even when the signal order is changed such as reordering for each IP-based packet.

With respect to the above-described embodiment, a program for configuring a computer functioning as a transmitting device 11 or a receiving device 17 and making each means of the transmitting device 11 or the receiving device 17 function can be preferably used. Specifically, at least a storage unit in which a control unit for controlling each means can be configured by a central processing unit (CPU) in a computer and a program necessary for operating each means is appropriately stored is at least. It can be configured with one memory. That is, by causing such a computer to execute the program by the CPU, the functions of the above-mentioned means can be realized. Further, a program for realizing the function of each means can be stored in a predetermined area of the above-mentioned storage unit (memory). Such a storage unit can be configured by a RAM or ROM inside the device, or can be configured by an external storage device (for example, a hard disk). Further, such a program can be configured as a part of software (stored in ROM or an external storage device) on an OS used by a computer. Further, the program for causing such a computer to function as each means can be recorded on a computer-readable recording medium. Further, each of the above-mentioned means may be configured as a part of hardware or software, and each of them may be combined and realized.

Although the above-mentioned examples have been described as representative examples, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present invention. For example, in the above-described embodiment, a mode in which the satellite transmission line of the ISDB-S3 method transmission method is used as a broadcast transmission line has been described, but it is planned that the transmission frame configuration will be substantially the same as that of the ISDB-S3 method, for example. It is also possible to use the next-generation terrestrial transmission line such as 4K / 8K as a broadcasting transmission line. Further, in the above-described embodiment, the mode in which the transmitter 11 and the m transmitters 12 are separately provided has been described, but the transmitter 11 is provided so as to include the m transmitters 12. You may. Therefore, the present invention should not be construed as being limited by the above embodiments, but only by the claims.

Although the present invention has been described above with reference to specific examples, the present invention is not limited to the above-mentioned examples and can be variously modified without departing from the technical idea. For example, in the above-described embodiment, the example in which the satellite transmission line is mainly used as the broadcast transmission line has been described, but the terrestrial transmission line may be used as the broadcast transmission line.

According to the present invention, even in an environment where the frequency of a broadcast transmission line is tight, it is possible to increase the overall transmission capacity related to data transmission and realize a transmission system having a high affinity with IP. It is useful for transmission systems that divide a large amount of data and multiplex it in a timely manner using the digital modulation method of.

1 Transmission system 10 Signal source device 11 Transmitter device 12,12-1,12-2, ..., 12-m transmitter 13,13-1,13-2, ..., 13-m Transmitter antenna 14 Broadcast satellite 15 Receive antenna 16, 16-1, 16-2, ..., 16-m receiver 17 receiver 18 display device 19 IP network 111 TLV signal generator 112 split frame generator 113 IP encapsulation section 171 split frame reconstruction section 172 IP decapsule 173 Output signal generator 174 Output interval adjustment unit

Claims (12)

A transmission device that bulk-transmits predetermined data in the TLV (Type Length Value) packet format using multiple broadcast transmission lines.
A TLV signal generation means that inputs predetermined data to be bulk-transmitted from a signal source device and converts it into a TLV packet format signal.
A divided frame with a frame length conforming to a common transmission method for a plurality of broadcast transmission lines used for the bulk transmission is defined, and the information bit rate required for transmission of the predetermined data is the maximum transmission rate of the plurality of broadcast transmission lines. When it fits within, the division frame is composed of the number of basic division slots corresponding to the plurality of broadcast transmission lines, and the maximum information bit rate required for transmission of the predetermined data can be transmitted on the plurality of broadcast transmission lines. When the transmission rate is exceeded, a predetermined number of basic division slots for transmission via the communication transmission line of the IP (Internet Protocol) network are added to the number of basic division slots corresponding to the plurality of broadcast transmission lines, and the division frame is added. Is configured, and each transmitter in the plurality of broadcast transmission lines and a connection to the communication transmission line are connected so as to divide and transmit the predetermined data converted into the TLV packet format signal based on the divided frame. Equipped with a divided frame generation means to control,
The divided frame generation means is characterized by having means for assigning identification information for uniquely specifying the signal order of the divided frames in each basic divided slot constituting the divided frame for each stream to be transmitted. Transmitter. The division frame generation means in the TLV header for each basic division slot constituting the division frame so as to distinguish the head TLV packet indicating the head TLV packet from the other TLV packets in each basic division slot. The first aspect of the invention is characterized in that the divided frame is configured so that the receiving side can identify which of the divided frames the TLV packet indicates the head of which basic divided slot. The transmitter described. The division frame generation means increments and allocates the numerical value of the packet type field in the head TLV packet indicating the head TLV packet of each basic division slot from a predetermined initial value for each stream to be transmitted, and assigns the value within a predetermined range. The transmission device according to claim 1 or 2, further comprising means for forming the identification information by repeating increments and assigning the identification information into each basic division slot. When composing the split frame, the split frame generation means calculates the corresponding information bit rate based on the coding modulation method of each of the plurality of broadcast transmission lines, and constitutes the basic split slot. Insert a null after the data allocated according to each information bit rate so that the frame length of the frame becomes a constant value, and insert a null into the basic division slot for the multiple broadcast transmission lines, and for the multiple broadcast transmission lines. The transmission device according to any one of claims 1 to 3, further comprising forming a basic division slot for the communication transmission line. The divided frame generation means makes it possible to change the number of slot divisions of the basic divided slots constituting the divided frame when the predetermined data is divided and bulk-transmitted in the TLV packet format, and the basic divided frame is configured. The transmission device according to any one of claims 1 to 4, further comprising means for notifying the receiving side of information on the number of slot divisions of the division slots and the unique number of each basic division slot. When the divided frame configured by the divided frame generation means includes a predetermined number of basic divided slots for transmission via the communication transmission path of the IP network, the predetermined number of basic divided slots are matched with the IP network. IP encapsulation means for dividing into IP-based packets and assigning an IP sequence number for uniquely specifying the signal order of the packets to each divided IP-based packet and transmitting the packet to the receiving device is further provided. The transmitting device according to any one of claims 1 to 5, wherein the transmission device is provided. A receiving device that receives the predetermined data bulk-transmitted by the transmitting device according to any one of claims 1 to 6.
IP decapsulation is performed for IP-based packets transmitted via the communication transmission lines of the IP network by receiving the signals in the TLV packet format bulk-transmitted via the plurality of broadcasting transmission lines and the communication transmission lines. After the signal order is arranged based on the IP sequence number for uniquely specifying the signal order given in the packet, the TLV signal is extracted and the predetermined number of basic division slots are reconstructed. A divided frame reconstructing means that rearranges the divided frames generated by the transmission device based on the identification information so as to reconstruct the divided frames.
An output signal generation means that concatenates the valid data of each basic division slot based on the reconstructed division frame and restores predetermined data of the same signal format as that transmitted from the signal source device.
In order to reduce the jitter at the time of external output of the predetermined data, a transmission interval adjusting means for adjusting the transmission interval of the output signal to be externally output, and a transmission interval adjusting means.
A receiving device characterized by comprising. The divided frame reconstructing means determines the head TLV packet based on the setting information in the TLV header among the TLV packet format signals received via the plurality of broadcast transmission lines and the communication transmission line, and any of them. The TLV packet indicating the head of which basic division slot in the division frame is identified, the TLV header between the basic division frames is determined, and the division frames generated by the transmission device are rearranged so as to be reconstructed. The receiving device according to claim 7, characterized in that. The identification information is formed by incrementing and allocating the numerical value of the packet type field in the head TLV packet indicating the head TLV packet of each basic division slot from a predetermined initial value and repeating the increment within a predetermined range. , Granted in each basic split slot,
The divided frame reconstructing means sets the numerical value of the packet type field in the head TLV packet assigned as the identification information among the TLV packet format signals received via the plurality of broadcast transmission lines and the communication transmission line. The transmission device according to claim 7 or 8, wherein the divided frames are rearranged so as to be reconstructed. When reconstructing the divided frame, the divided frame reconstructing means calculates the corresponding information bit rate based on the coding modulation method of each of the plurality of broadcast transmission lines, and constitutes each basic divided slot. A null is inserted after the data allocated according to each information bit rate so that the frame length of the divided frame becomes a constant value, and the basic divided slot for the plurality of broadcast transmission lines and the plurality of broadcast transmission lines are used. The receiving device according to any one of claims 7 to 9, wherein a basic division slot for the communication transmission line is formed in accordance with the above. The division frame generation means of the division frame to be reconstructed based on the information of the number of divisions of the basic division slots constituting the division frame and the unique number of each basic division slot notified in advance by the transmission device. The receiving device according to any one of claims 7 to 10, further comprising means for identifying the structure. The transmission interval adjusting means receives the predetermined data divided by the transmission device by the reception device, reconstructs it as an output signal of an IP packet string, and outputs the information bit rate of the predetermined data to the outside. By calculating the transmission interval of each IP packet from the processing time corresponding to the above and each IP packet length of the IP packet string and outputting each packet of the IP packet string according to the transmission interval, the transmission interval of the IP packet varies. The receiving device according to any one of claims 7 to 11, further comprising means for suppressing the above.

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