JP2014103476A - Transmission system for stl/ttl line, transmission apparatus for stl/ttl line, ts re-multiplexing device, additional information insertion control device, and reception apparatus for stl/ttl line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission system for an STL/TTL line for transmitting a connected and combined TS via the STL/TTL line, the connected and combined TS being obtained by arbitrarily connecting and combining a plurality of kinds of segment type broadcast TS as many as or less than a predetermined number of segments, and a reception apparatus therefor.SOLUTION: The transmission system for an STL/TTL line comprises a transmission apparatus 1 for the STL/TTL line which monitors a TSP counter value of a predetermined segment type broadcast TS, generates a compressed broadcast TS by deleting null packets of predetermined TSP counter values in accordance with a transmission parameter, generates a connected and combined TS by connecting the compressed broadcast TS and a broadcast TS to which data compression is not applied, and transmits the connected and combined TS to the outside; and an additional information insertion control device 8 which multiplexes first additional information before applying the data compression and multiplexes second additional information after applying the data compression. A reception apparatus 10 for the STL/TTL line separates the connected and combined TS, decompresses the compressed broadcast TS, and recovers the original broadcast TS.

Description

  The present invention is a STL / (Studio Transmitter Link) / TTL (TTL) for transmitting a digital broadcast signal by a segment connection method such as multimedia broadcasting using the VHF-Low band from a performance station to a transmission station or from a transmission station to a transmission station. Transmitter to Transmitter Link) A transmission system for STL / TTL lines that transmits in the form of a signal format of a broadcast transport stream (hereinafter referred to as “broadcast TS”) that is a transmission signal for the line, a transmitter for an STL / TTL line, The present invention relates to a TS remultiplexing apparatus, an additional information insertion control apparatus, and an STL / TTL line receiving apparatus.

  As a signal format when transmitting a broadcast TS for an STL / TTL line, in the case of digital terrestrial television broadcasting, the signal format by the broadcast TS as described in Chapter 5 of the appendix of the ARIB standard ARIB STD-B31 In terrestrial multimedia broadcasting using the segment connection transmission method, the broadcasting TS, 12 segment format signal and 1 segment format signal as described in Chapter 5 of the appendix of ARIB standard ARIB STD-B46 are connected. A signal format based on a combined broadcast TS (hereinafter referred to as “concatenated combined TS”) is known.

  As a conventional technique, a technique related to a transmission system for effectively using a broadcast TS by changing and replacing information in a dummy byte part of the broadcast TS with respect to a broadcast TS for an STL / TTL line is disclosed (for example, a patent). Reference 1). Further, a digital terrestrial television broadcast network system that transmits information using a null packet of a broadcast TS is disclosed (for example, see Patent Document 2).

JP 2010-252136 A JP 2011-15060 A

  In multimedia broadcasting based on the segment concatenation transmission method using the VHF-Low band, a signal obtained by concatenating a plurality of signals (maximum 14 segments) of 1 segment format or 3 segment format is modulated for STL / line or TTL line. To transmit.

  However, since the ARIB STD-B31 is specialized for digital terrestrial television broadcasting, it is a broadcast TS format (transmission speed 32.51 Mbps (= 512/63 × 4 Mbps)) with a fixed number of segments of 13 segments. Can only transmit.

  On the other hand, ARIB STD-B46 defines the signal format for multimedia broadcasting by the segment concatenated transmission method using the VHF-High band, and has been extended for segment concatenated transmission. This is a signal format of a concatenated TS considered for transmission of a total of 33 segments of signals and seven 1-segment signals. The transmission speed of the 13-segment broadcast TS is 32.51 Mbps (= 512/63 × 4 Mbps), and the transmission speed of the 1-segment broadcast TS is 2.03 Mbps (= 512/63/4 Mbps). Are combined to generate a concatenated composite TS, which has a transmission rate of 79.24 Mbps (= 512/63 × (4 × 2 + 7/4) Mbps). In multimedia broadcasting by the segment concatenated transmission method using the VHF-High band, it is mainly intended to use satellite distribution instead of the STL / TTL line.

  Multimedia broadcasting by the segment concatenation transmission method using the VHF-Low band is configured in one segment format or three segment format, and it is considered that the number of each segment format is arbitrarily concatenated with the number of segments of 14 segments or less. Yes. The transmission speed of the one-segment broadcast TS is 2.03 Mbps (= 512/63/4 Mbps), and the transmission speed of the three-segment broadcast TS is 8.12 Mbps (= 512/63 Mbps). When broadcasting TSs are concatenated and combined as they are, if the 1-segment format is 14, the transmission speed of the concatenated TS is 28.44 Mbps (= 512/63/4 × 14 Mbps), but the 3 segment format is 4 In the case where one segment format is composed of two in total, the transmission speed of the concatenated combined TS is 36.57 Mbps (= 512/63 × 4 + 512/63/4 × 1 Mbps). Therefore, the transmission speed of the combined composite TS that is combined and combined differs depending on the segment configuration, and exceeds the transmission speed of 32.51 Mbps in terrestrial digital television broadcasting, and is transmitted through the same STL / TTL line as in terrestrial digital television broadcasting. Difficult to do.

  On the other hand, in the technique of Patent Document 1, it is possible to effectively use the broadcast TS by changing and replacing the information in the dummy byte portion of the broadcast TS. However, the segment linked transmission method using the VHF-Low band is used. In multimedia broadcasting, no means is provided for solving the problem of use for an STL / TTL line similar to terrestrial digital television broadcasting due to the transmission rate of the combined composite TS being different depending on the segment configuration.

  Further, in the technique of Patent Document 2, it is possible to effectively use the broadcast TS in terms of transmitting information using a null packet of the broadcast TS, but the segment connection broadcast TS is not considered, It does not provide means for solving the problem of use for an STL / TTL line similar to terrestrial digital television broadcasting due to the transmission rate of the concatenated combined TS being different depending on the segment configuration.

  In the case of terrestrial digital television broadcasting and multimedia broadcasting using the VHF-High band, the broadcasting TS is defined in the appendix chapter 5 of ARIB STD-B31 and the appendix chapter 5 of ARIB STD-B46. As described above, it is specified that additional information (transmission control information) necessary for controlling the transmitting station is multiplexed during transmission of the broadcast TS. This additional information is multiplexed on the dummy byte of each TSP, the IIP (ISDB-T Information Packet) in the invalid layer TSP of the broadcast TS, etc. according to the information type in the additional information. For example, the transmission parameter is IIP, and information such as the TSP counter value is multiplexed on the dummy byte portion of each TSP. In addition, in ARIB STD-B46 (version 1.2 revised on July 3, 2012), the segment configuration control information at the time of concatenated transmission (that is, concatenated transmission control information) is broadcast when the concatenated composite TS is generated. It is added by CIP (Connected transmission Information Packet) in the TS invalid layer TSP. However, the format of additional information multiplexed on the broadcast TS of the VHF-Low band multimedia broadcast is not defined at this stage.

  Therefore, when transmitting a broadcast TS for an STL / TTL line, it is desirable for the receiving side to perform transmission with less delay with respect to predetermined additional information related to the broadcast TS.

  The present invention has been made in view of the above-mentioned problems, and efficiently combines STL / TTL together with additional information into a combined TS obtained by arbitrarily connecting and synthesizing a plurality of types of segment-type broadcasting TS within a predetermined number of segments. It is an object of the present invention to provide an STL / TTL line transmission system, an STL / TTL line transmission apparatus, a TS remultiplexing apparatus, an additional information insertion control apparatus, and an STL / TTL line reception apparatus that transmit on a line.

  As described above, VHF-Low band multimedia broadcasting is considered to be composed of a maximum of 14 segments with a bandwidth of 6 MHz. In this broadcast, the number of segments of 14 segments or less is arbitrarily linked and broadcast. The transmission speed of a one-segment broadcast TS (TS: transport stream) is 2.03 Mbps (= 512/63/4 Mbps), and the transmission speed of a three-segment broadcast TS is 8.12 Mbps (= 512/63 Mbps). When these broadcasting TSs are synthesized as they are, the transmission speed of the combined synthesis TS synthesized depending on the segment configuration (1 segment format or 3 segment format) is different and exceeds the transmission rate of 32.51 Mbps in terrestrial digital television broadcasting. It will be.

  Therefore, in the transmission system for an STL / TTL line according to one aspect of the present invention, a digital broadcasting signal based on a segment concatenation method such as VHF-Low band multimedia broadcasting is transmitted from a performance station to a transmission station (STL) in the form of a broadcast TS. When transmitting from a station to a transmitting station (TTL), a broadcasting TS of 8.12 Mbps (= 512/63 Mbps) 3-segment format is compressed and converted to a 6.10 Mbps (= 512/63/4 × 3 Mbps) broadcasting. Regardless of the segment configuration (1-segment format or 3-segment format), a TS is generated and transmitted as a transmission signal with a constant combined rate TS that can use the same STL / TTL line as terrestrial digital television broadcasting. To do. That is, in the transmission system for an STL / TTL line according to one aspect of the present invention, the broadcast TS at the time of segment connection is equal to or less than 32.51 Mbps (= 512/63 × 4 Mbps), which is the transmission speed of the broadcast TS of terrestrial digital television broadcasting. STL similar to terrestrial digital television broadcasting is generated by compressing the broadcast TS of the digital broadcast signal so that the transmission speed is achieved, and generating a concatenated combined TS of 32.51 Mbps as the transmission speed by adjusting the rate by adding a null packet. / Use a TTL line.

  Regarding the compression / conversion of the broadcast TS in the 3-segment format according to the present invention, the STL / TTL line transmission system according to the present invention is included in the broadcast TS in the 3-segment format (transmission speed 8.12 Mbps (= 512/63 Mbps)). Null packet is deleted and converted to a broadcast TS compressed to 6.10 Mbps (= 512/63/4 × 3 Mbps). As a result, among the configurations of arbitrarily connected segments, as a combination that maximizes the transmission rate after broadcasting TS connection, there are four 3-segment formats and one segment type (transmission rate 2.03 Mbps (= 512/63/4 Mbps)) ) Is composed of two 14 segments, the total transmission speed of the broadcast TS is equal to or less than the broadcast TS that can be transmitted through the STL / TTL line of digital terrestrial television broadcasting (32.51 Mbps (= 512/63 × 48.4 Mbps) or less) = 28.44 Mbps (= 512/63 × 3/4 × 4 + 512/63/4 × 2 Mbps). Thereafter, a null packet is added to adjust the rate so that the transmission speed is the same as that of the broadcast TS of the terrestrial digital television broadcast, so that the STL / TTL line of the terrestrial digital television broadcast can be used as it is. Also, it is preferable that the position of the null packet to be deleted at the time of data compression is determined in advance so as to minimize the delay amount according to a predetermined transmission parameter.

  Further, regarding the compression / conversion of the three-segment broadcast TS according to the present invention, when the null packet included in the three-segment broadcast TS is deleted and converted into the compressed broadcast TS, information such as transmission parameters is not compressed. And AC data, IIP, carrier-specific data, etc. are multiplexed into a null packet of the compressed broadcast TS. The predetermined additional information multiplexed when transmitting the broadcast TS for the STL / TTL line includes information related to the broadcast TS such as TMCC, AC data, and carrier-specific data including transmission parameters. In the / TTL line transmission system, this predetermined additional information is classified into three types of additional information and individually multiplexed with the broadcast TS and the compressed broadcast TS, so that the compressed broadcast TS is expanded. The delay can be minimized, and an efficient broadcast TS and additional information can be transmitted.

  That is, the STL / TTL line transmission system according to the present invention transmits an STL / TTL transmission of a combined composite TS that is arbitrarily connected and combined within a predetermined number of segments for a plurality of types of segment-type broadcast TSs via an STL / TTL line. A transmission system for a line that monitors a TSP counter value of a broadcast TS of a predetermined segment format among the plurality of types of segment format broadcast TSs and determines a TSP counter value determined in advance according to a transmission parameter of the broadcast TS The compressed broadcast TS in which data compression has been performed on the broadcast TS is generated by deleting the null packet, and the combined composite TS is generated by connecting the compressed broadcast TS and the broadcast TS not subjected to data compression. STL / TTL times for which TS is subjected to predetermined transmission path coding and transmitted to the outside via the STL / TTL line. The additional information related to the TSP of the broadcast TS and the TSP of the broadcast TS is set as the first additional information, the information that is changed as needed by each operator and the additional information transmitted by the IIP are classified as the second additional information, and the compression Additional information insertion control means for multiplexing the first additional information on the broadcast TS to be compressed before performing data compression on the broadcast TS, and multiplexing the second additional information on the compressed broadcast TS after performing the data compression; It is characterized by providing. Also, in the STL / TTL line transmission system of the present invention, the STL / TTL line transmission means is a third grouped as information related to concatenated transmission among the additional information multiplexed on the plurality of types of segment-type broadcast TSs. The information processing apparatus includes a combining unit that multiplexes and synthesizes additional information with each of the plurality of types of segment-type broadcast TSs when generating the combined combining TS.

  Furthermore, the STL / TTL line transmitting apparatus of the present invention transmits a combined combined TS that is arbitrarily combined and combined with a plurality of types of segment-type broadcast TSs with a predetermined number of segments or less, via an STL / TTL line. Of the additional information multiplexed on the plurality of types of segment-type broadcast TS, the additional information related to the TSP of the broadcast TS is the first additional information, and additional information that is changed as needed by each operator. And the additional information transmitted by IIP is classified as second additional information, and the additional information related to the concatenation transmission is classified as third additional information in advance, and the one additional information is multiplexed among the plurality of types of segment-type broadcast TSs. The TSP counter value of the broadcast TS of a predetermined segment format is monitored, and a TSP count determined in advance according to the transmission parameter of the broadcast TS A data compression / additional information multiplexing unit that performs data compression on the broadcast TS by deleting a null packet of the value to generate a compressed broadcast TS, and multiplexes the second additional information after the data compression; Combining the compressed broadcast TS and the broadcast TS that is not subjected to the data compression among the plurality of types of segment-format broadcast TS, and generating a combined composite TS to which the third additional information is added; Transmission means for performing predetermined transmission line coding on the synthesized TS and transmitting the resultant TS to the outside through an STL / TTL line.

  Further, in the STL / TTL line transmission apparatus of the present invention, the null packet of the predetermined TSP counter value to be deleted is predetermined so as to minimize the delay amount of the broadcast TS according to the transmission parameter. It is characterized by being.

  Also, in the STL / TTL line transmission apparatus of the present invention, the combining means may control the transmission rate of the combined combined TS regardless of the segment configuration by arbitrarily connecting the broadcast TSs of the plurality of types of segments. It is characterized by comprising means for inserting a null packet so as to obtain a constant transmission rate that can be transmitted through an STL / TTL line.

  Further, the TS remultiplexing apparatus of the present invention is a TS remultiplexing apparatus that generates a broadcast TS by multiplexing predetermined additional information according to the segment format for a plurality of types of segment format broadcast TSs, Of the additional information multiplexed into the broadcast TS of a plurality of types of segments, the additional information related to the TSP of the broadcast TS is the first additional information, and the additional information that is changed as needed by each operator and the additional information transmitted by IIP are First TS remultiplexing unit that multiplexes the first additional information for the three-segment broadcast TS out of the plurality of types of segment-type broadcast TS, and is classified in advance as second additional information; Among the segment TS broadcast TSs, for one segment format broadcast TS, the additional information belonging to the classification of the first additional information and the second additional information is multiplexed. Characterized in that it comprises one or both of the second TS re-multiplexing unit.

  Further, the additional information insertion control device of the present invention is an additional information insertion control device that generates a broadcast TS by multiplexing predetermined additional information according to a segment format for a plurality of types of segment format broadcast TSs. Of the additional information multiplexed on the broadcast TS of the plurality of types of segments, the additional information related to the TSP of the broadcast TS is the first additional information, and additional information that is changed as needed by each operator and the additional information transmitted by IIP The information is preliminarily classified as second additional information. Among the plurality of types of segment-type broadcast TS, the three-segment type broadcast TS is multiplexed with the first additional information, and the plurality of types of segment-type broadcast TS. 1 segment format broadcast TS is controlled to multiplex the additional information belonging to the classification of the first additional information and the second additional information. Characterized in that it comprises the that additional information insertion control unit.

Furthermore, the STL / TTL channel receiver of the present invention receives STL / TTL on a STL / TTL channel, which is a combined synthesized TS that is arbitrarily linked and combined with a plurality of types of segment-type broadcast TSs within a predetermined number of segments. Null packet of a TSP counter value determined in advance according to the transmission parameter of the broadcast TS for a broadcast TS of a predetermined segment format among the plurality of types of segment format broadcast TSs on the transmission side. The combined broadcast TS obtained by linking and combining the compressed broadcast TS subjected to data compression by deleting the broadcast TS not subjected to the data compression among the multiple types of segment TS broadcast TS Separating means for separating into segment-type broadcast TS, and monitoring the TSP counter value of the compressed broadcast TS, TSP counter value When it is a continuous value, TSPs are concatenated in the order in which the compressed broadcast TSs are separated. When the TSP counter value is not a continuous value, null packets are inserted until the TSP counter value reaches a continuous value to restore the broadcast TS. Data decompression means for
It is characterized by providing.

  Further, in the STL / TTL line receiver of the present invention, the null packet of the predetermined TSP counter value to be deleted is determined in advance so that the delay amount of the broadcast TS is minimized according to the transmission parameter. It is characterized by being.

  Further, in the STL / TTL line receiver of the present invention, the separating means includes means for deleting null packets inserted so as to have a constant transmission rate that can be transmitted on the STL / TTL line on the transmitting side. It is characterized by providing.

  According to the present invention, in a transmission signal arbitrarily connected and synthesized with a predetermined number of segments or less for a plurality of types of segment-type broadcast TS, for example, in a multimedia broadcast transmission signal connected with 14 or less segments, Regardless of (1-segment format or 3-segment format), a concatenated combined TS can be configured at a predetermined transmission rate (for example, 32.51 Mbps (= 512/63 × 4 Mbps)) or less. A similar STL / TTL line can be used. Furthermore, with respect to predetermined additional information including TMCC including transmission parameters, AC data, provider-specific data, and the like, it is possible to minimize a delay due to compression / decompression related to transmission of the broadcast TS.

It is a block diagram which shows the structure of the transmission system for STL / TTL lines of 1st Embodiment by this invention. It is a figure which shows an example of the kind of additional information which concerns on the transmission system for STL / TTL circuits of 1st Embodiment by this invention, and its classification example. It is a block diagram which shows the structure of the data compression and additional information multiplexing part in the transmission system for STL / TTL lines of 1st Embodiment by this invention. It is a figure which shows the multiplexing position of the additional information contained in the dummy byte part of each TSP which concerns on the transmission system for STL / TTL circuits of 1st Embodiment by this invention. It is a block diagram which shows the structure of the synthetic | combination part in the transmission system for STL / TTL lines of 1st Embodiment by this invention. It is a figure which shows an example of the bit allocation of the connection and synthetic | combination TS distinction information, segment format information, and unit transmission wave information in the transmission system for STL / TTL lines of 1st Embodiment by this invention. It is a table | surface which shows the number of TSP contained in 1 multiplex frame which concerns on the transmission system for STL / TTL circuits of 1st Embodiment by this invention. Mode 1, guard interval 1/4, A layer QPSK (coding rate 2/3), B layer 16QAM (coding rate 1/2) according to the transmission system for an STL / TTL line of the first embodiment of the present invention It is a figure which shows broadcast TS packet arrangement | positioning in the case. Extraction in Mode 1, Guard Interval 1/4, A Layer QPSK (Coding Rate 2/3), and B Layer 16 QAM (Coding Rate 1/2) in the Transmission System for STL / TTL Lines of the First Embodiment of the Present Invention It is a table | surface which shows a TSP table. It is a block diagram which shows the structure of the receiver for STL / TTL lines of 1st Embodiment by this invention. It is a block diagram which shows the structure of the data expansion part in the receiver for STL / TTL lines of 1st Embodiment by this invention. It is a figure which shows the broadcast TS packet arrangement | positioning whose TSP counter value is 0 to 39 in the case of the mode 3 and the guard interval 1/8 in the transmission system for STL / TTL lines of 2nd Embodiment by this invention. It is a block diagram which shows the structure of the transmitter for STL / TTL lines of a comparative example. It is a block diagram which shows the structure of the data compression part in the transmission apparatus for STL / TTL lines of a comparative example. It is a block diagram which shows the structure of the data expansion part in the receiver for STL / TTL lines of a comparative example. It is a block diagram which shows the structure of the transmission system for STL / TTL lines of 3rd Embodiment by this invention.

  Referring to the drawings, the STL / TTL line transmission system, STL / TTL line transmission apparatus, TS remultiplexing apparatus, additional information insertion control apparatus, and STL / TTL line reception apparatus according to the first embodiment of the present invention will be described below. Will be described.

[First Embodiment]
(Transmission system for STL / TTL lines)
FIG. 1 is a block diagram showing the configuration of the STL / TTL line transmission system according to the first embodiment of the present invention. In the present embodiment, the total transmission speed of the broadcast TS is the largest, that is, four three-segment broadcast transport streams (hereinafter referred to as broadcast TS) and two one-segment broadcast TS ( A description will be given of an example in which a concatenated TS of VHF-Low band multimedia broadcasting composed of a total of 14 segments) is transmitted through one STL / TTL line of terrestrial digital television broadcasting.

  Referring to FIG. 1, the STL / TTL line transmission system of the present embodiment is predetermined for a STL / TTL line transmission apparatus 1 and a TS of a three-segment format (hereinafter also referred to as “3seg”). 3seg TS remultiplexers 6-1, 6-2, and 6 that multiplex the first additional information A classified from the additional information (described later in detail in FIG. 2) to form a 3-segment broadcast TS. -3, 6-4, and TS of one segment format (hereinafter also referred to as “1seg”), information belonging to the first additional information A and the second additional information B among the predetermined additional information is multiplexed. 1-segment TS remultiplexing apparatuses 7-1 and 7-2 for forming a one-segment broadcast TS, and first additional information A, first-second information A, first-second information A 2 additional information B and 3rd additional information C And, and a supplementary information insertion control unit 8 for outputting the information belonging to the first additional information A and the second additional information B.

  The additional information insertion control device 8 includes a segment format determination unit 81 and an additional information insertion control unit 82. The segment format determination unit 81 determines whether the TS for the STL / TTL line to be transmitted is a 1-segment format signal or a 1-segment format signal, and sends the determination result to the additional information insertion control unit 82 To do. The additional information insertion control unit 82 outputs the first additional information A and the second additional information B classified from predetermined additional information with respect to the signal of the three segment format based on the determination result, and outputs the one segment format. Of the predetermined additional information, the information belonging to the first additional information A and the second additional information B is output, and when the concatenated combined TS is generated for the three-segment signal and the one-segment signal. The third additional information C to be multiplexed in common is output.

  Additional information for signals in the 1 segment format output from the additional information insertion control device 8 (information belonging to the first additional information A and the second additional information B) is sent to the 1-segment TS remultiplexers 7-1 and 7-2. Entered. Further, the first additional information A and the second additional information B for signals in the three-segment format output by the additional information insertion control device 8 are the TSP scheduled to be deleted when data is compressed, the IIP, the AC data, and the carrier-specific data. In order to prevent this from happening, the first additional information A is multiplexed by the 3seg TS remultiplexer 6-1, 6-2, 6-3, 6-4 before data compression, and the second additional information A Information B is output at a different timing so as to be multiplexed after data compression by the STL / TTL line transmission apparatus 1. The first additional information A, second additional information B, and third additional information C to be classified will be described in detail later with reference to FIG.

  The 3seg TS remultiplexers 6-1, 6-2, 6-3, and 6-4 are devices that perform TS remultiplex processing for each unit transmission wave. A TS re-multiplexing unit 61 that multiplexes the first additional information A classified from the information to form and output a three-segment broadcast TS is provided. In the present specification, each of the 3seg TS remultiplexing apparatuses 6-1, 6-2, 6-3, and 6-4 will be collectively referred to as “3seg TS remultiplexing apparatus 6”.

  The 1seg TS remultiplexing devices 7-1 and 7-2 are devices for performing TS remultiplexing processing for each unit transmission wave in the same way as the 3seg TS remultiplexing device 6, but each adds one segment format signal. A TS remultiplexing unit 71 is provided that multiplexes information (information belonging to the first additional information A and the second additional information B) to form and output a broadcast TS of one segment format. In the present specification, each of the 1seg TS remultiplexing apparatuses 7-1 and 7-2 will be collectively referred to as "1seg TS remultiplexing apparatus 7".

  The TS remultiplexing units 61 and 71 in the 3seg TS remultiplexing device 6 and the 1seg TS remultiplexing device 7 perform TS remultiplexing processing for each unit transmission wave by using the additional information classified for each. The information indicating that the broadcast TS is a broadcast TS is added to the dummy byte of each broadcast TS.

  The STL / TTL line transmitter 1 transmits a digital broadcasting signal by a segment connection method such as multimedia broadcasting in the VHF-Low band in the form of a broadcast TS from a performance station to a transmission station (STL) and from a transmission station to a transmission station (TTL). A predetermined number of three-segment broadcast TSs and a predetermined number of one-segment broadcast TSs are multiplexed and generated to generate a combined combined TS of 14 segments. Data compression / additional information multiplexing units 9-1, 9-2, 9-3, and 9-4 provided for each three-segment broadcasting TS output from the 3seg TS re-multiplexing device 6 Among them, collectively referred to as “data compression / additional information multiplexing unit 9”) and a broadcast TS after compression sent from each data compression / additional information multiplexing unit 9 (hereinafter referred to as “compression release”). And a combining unit 3 for generating a combined combined TS by combining and combining each one-segment broadcast TS output from the 1-segment TS remultiplexing device 7, and an STL / TTL transmission line code. And a radio frequency (RF) transmitter 5.

  As shown in FIG. 1, first, four 3-segment broadcast TSs and two 1-segment broadcast TSs are input to the STL / TTL line transmission apparatus 1. A three-segment broadcast TS has a transmission rate of 8.12 Mbps (= 512/63 Mbps), and a one-segment broadcast TS has a transmission rate of 2.03 Mbps (= 512/63/4 Mbps). Of the input broadcast TS, those in the three-segment format are respectively input to the data compression unit 2. The one-segment format is directly input to the synthesis unit 3.

  The data compression / additional information multiplexing unit 9 performs data compression on a broadcast TS of 8.12 Mbps (= 512/63 Mbps) to a compressed broadcast TS of 6.10 Mbps (= 512/63/4 × 3 Mbps), and further data compression The second additional information B is multiplexed after data compression and output to the combining unit 3 as a compressed broadcast TS so that the TSP scheduled to be deleted sometimes does not become IIP, AC data, and carrier-specific data.

  The synthesizing unit 3 receives the third additional information C and the four 3-segment compressed broadcast TS output from the data compression / additional information multiplexing unit 9 and is output from the 1-segment TS remultiplexing device 7 Two 1-segment broadcast TSs are directly input, and four 3-segment compressed TSs and two 1-segment broadcast TSs are combined, and a constant transmission speed is obtained by adjusting the rate by adding null packets. Is generated and output to the STL / TTL transmission line encoding unit 4. In the case of this embodiment, the total transmission rate of the broadcast TS and the compressed broadcast TS is 28.44 Mbps (= 512/63/4 × (3 × 4 + 2) Mbps). Therefore, one connected combined TS having a constant transmission rate of 32.51 Mbps (= 512/63 × 4 Mbps) is output from the combining unit 3 by adding one null packet for every seven TSPs. .

  The STL / TTL transmission line coding unit 4 performs predetermined transmission line coding (for example, similar to ARIB STD-B31) on the concatenated combined TS to generate an IF (Intermediate Frequency) signal, and an RF transmission unit Send to 5.

  The RF transmission unit 5 converts the IF signal of the concatenated combined TS subjected to transmission path encoding into an RF signal having a predetermined frequency, generates a broadcast wave, and sends it out.

  FIG. 2 shows an example of types of transmission control information (additional information) to be multiplexed on a broadcast TS signal and its classification example with respect to predetermined additional information used in the present embodiment. In the present embodiment, information that is not changed in a frame such as TMCC identification, and TSP position and synchronization-related information in a frame such as a TSP counter value are classified as first additional information A, while AC Information that is changed as needed, such as data and operator-specific data, and information transmitted by IIP are classified as second additional information B. Furthermore, segment configuration control information (that is, concatenated transmission control information), segment format information, unit transmission wave information, and the like at the time of concatenated transmission multiplexed at the time of generating the concatenated composite TS are the third additional information C as information related to concatenated transmission. are categorized. However, the hierarchical information for each TSP belongs to the first additional information A and the second additional information B, but is rewritten when the second additional information B is multiplexed after the first additional information A is multiplexed. The broadcast TS / concatenated / combined TS distinction information belongs to the first additional information A, the second additional information B, and the third additional information C. The second additional information B after the first additional information A is multiplexed. Is rewritten when the third additional information C is multiplexed at the time of generating the concatenated synthesis TS. However, the type of the predetermined additional information according to the present embodiment is not limited to the type illustrated in FIG.

  FIG. 3 is a block diagram showing the configuration of the data compression / additional information multiplexing unit 9 in the STL / TTL line transmission apparatus 1 of the present embodiment. The data compression / additional information multiplexing unit 9 includes a TSP buffer 91, a TSP counter value extraction unit 92, an extraction TSP table selection control unit 93, an extraction TSP table storage unit 93a, a TSP extraction unit 94, and an additional information multiplexing unit. 95. A three-segment broadcast TS in which the first additional information A is multiplexed is input to the TSP buffer 91 and the TSP counter value extracting unit 92, and the second additional information B output from the additional information insertion control device 8 is extracted TSP table selection. The data is input to the control unit 93 and the additional information multiplexing unit 95.

  The TSP buffer 91 has a function of temporarily storing broadcast TS packets (hereinafter referred to as “TSP”) in the input three-segment broadcast TS, and a predetermined TSP counter value is controlled by a TSP extraction unit 94 described later. Is read.

  The TSP counter value extraction unit 92 extracts the TSP counter value in the first additional information A included in the dummy byte portion of each TSP shown in FIG. 4 and sends it to the TSP extraction unit 94.

  The extracted TSP table selection control unit 93 inputs the transmission parameters included in the TMCC in the second additional information B output from the additional information insertion control device 8, and stores a plurality of extracted TSP tables corresponding to the transmission parameters in advance. The extracted TSP table that matches the transmission parameter extracted by the extracted TSP table selection control unit 93 is selected from the extracted TSP table storage unit 93 a, read out, and output to the TSP extraction unit 94. Here, the extracted TSP table is a table showing TSP counter values of TSPs extracted as compressed broadcast TSs among the TSPs constituting the three-segment format broadcast TS, and the creation method thereof will be described in detail later.

  The TSP extraction unit 94 receives the TSP counter value output from the TSP counter value extraction unit 92 and refers to the extraction TSP table output from the extraction TSP table selection control unit 93, and the compressed broadcast TS from the TSP buffer 91. And the corresponding TSP is extracted and sent to the additional information multiplexing unit 95.

  The additional information multiplexing unit 95 receives the TSP extracted by the TSP extraction unit 94 each time information (AC data, data transmitted by IIP, business-specific data, etc.) included in the second additional information B is input. The second additional information B is multiplexed into a null packet (Null_TSP). At this time, the hierarchical information for each TSP multiplexed with the first additional information A is rewritten. As a result, the broadcast TS of 8.12 Mbps (= 512/63 Mbps) is multiplexed with the additional information including the information of the first additional information A and the second additional information B. 6.10 Mbps (= 512/63/4 × 3 Mbps) ) Of the compressed broadcast TS.

  FIG. 5 is a block diagram showing a configuration of the combining unit 3 in the STL / TTL line transmission apparatus 1 of the present embodiment. The combining unit 3 includes an additional information adding unit 31-1, 31-2, 31-3, 31-4, 32-1, 32-2, a TS combining unit 33, a null packet generating unit 34, and a rate adjusting unit. 35.

  The additional information adding units 31-1, 31-2, 31-3, 31-4 are three segments respectively output from the data compression / additional information multiplexing units 9-1, 9-2, 9-3, 9-4. The compressed broadcast TS of the format is input, and the concatenated / combined TS discrimination information, the segment format information and the unit transmission wave information included in the third additional information C are multiplexed on the dummy bytes of the compressed broadcast TS and output to the TS combining unit 33. .

  The additional information adding units 32-1 and 32-2 receive the 1-segment broadcasting TSs output from the 1seg TS remultiplexers 7-1 and 7-2, respectively, and the concatenation included in the third additional information C The combined TS distinction information, segment format information, and unit transmission wave information are multiplexed on the dummy bytes of the broadcast TS and output to the TS combining unit 33.

  The TS composition unit 33 includes a compressed broadcast TS obtained from the additional information addition units 31-1, 31-2, 31-3, and 31-4, and a broadcast TS obtained from the additional information addition units 32-1 and 32-2. , CIP is multiplexed and combined and output to the rate adjustment unit 35. Thereby, a concatenated combined TS in which all information in the predetermined additional information is multiplexed is generated.

  Since the transmission rate at the output of the TS synthesizing unit 33 varies depending on the number of compressed broadcast TSs and one-segment broadcast TSs that are input, the null packet generating unit 34 receives null packets in response to a request from the rate adjusting unit 35. (Null_TSP) is generated and output to the rate adjustment unit 35.

  The rate adjusting unit 35 inserts a null packet (Null_TSP) generated by the null packet generating unit 34 so that the rate adjusting unit 35 becomes a concatenated combined TS having a constant speed of 32.5 Mbps (= 512/63 × 4 Mbps). As a result, a rate-adjusted constant combined TS is generated and output.

  In the description of the synthesizing unit 3 shown in FIG. 5 above, the concatenated / synthesized TS distinction information and the segment format included in the third additional information C in the dummy bytes of the compressed broadcast TS of the three segment format and the broadcast TS of the one segment format The information and the unit transmission wave information are multiplexed on the dummy bytes of the broadcast TS, and then the three-segment compressed broadcast TS and the one-segment broadcast TS are combined. After synthesizing the broadcast TS of 1 segment format, concatenated / synthesized TS distinction information, segment format information and unit transmission included in the third additional information C in the dummy byte of the compressed broadcast TS of 1 segment format or broadcast TS of 1 segment format You may comprise so that wave information may be multiplexed.

  Regarding the bit allocation of the concatenated / combined TS discriminating information, the segment format information, and the unit transmission wave information, as illustrated in FIG. 6, the concatenated / combined TS discriminating information (the fifth bit to the fifth bit) is included in the third additional information C. 7 bits), segment format information (4th bit), and unit transmission wave information (0th bit to 3rd bit).

(Extraction TSP table creation method according to transmission parameters in the first embodiment)
Next, a method for creating an extracted TSP table according to transmission parameters stored in advance in the extracted TSP table storage unit 93a will be described. The 3-segment VHF-Low band multimedia broadcast is scheduled to be composed of two layers (A layer and B layer) of one segment and two segments. For this reason, the broadcast TS has a multi-frame structure in which the ASP of the A layer, the TSP of the B layer, and a null packet are connected. The null packet is inserted in order to interface the TSP with a constant clock regardless of the transmission parameter. The number of TSPs included in a multiplex frame differs depending on the mode and guard interval ratio, and the arrangement of TSPs and null packets in each layer in the multiplex frame depends on transmission parameters (mode, guard interval ratio, modulation scheme in each layer, coding rate). Different. In other words, the arrangement of TSPs and null packets in each layer in a multiplexed frame is uniquely determined by the transmission parameters (mode, guard interval ratio, modulation scheme of each layer, and coding rate) regardless of the content to be transmitted.

  Here, FIG. 7 shows the number of TSPs included in one multiplexed frame, FIG. 8 shows mode 1, guard interval 1/4, A layer QPSK (coding rate 2/3), and B layer 16 QAM (coding rate 1/2). The broadcast TS packet arrangement in the case of is shown. In order to compress data from a broadcast TS to a compressed broadcast TS, null packets that are a quarter of the number of broadcast TS packets included in one multiplexed frame may be deleted. In order to reduce the delay, it is desirable to disperse the broadcast TS packets to be deleted at equal intervals. However, since the A layer and the B layer are not inserted at equal intervals, in this embodiment, as the compressed broadcast TS, An extracted TSP table indicating the TSP counter value of the TSP to be extracted (ie, the TSP counter value of the TSP not deleted in the broadcast TS) is created and stored in the extracted TSP table storage unit 93a.

  First, as a TSP to be deleted, in view of shortening the delay amount, a TSP counter value is deleted based on a TSP having any of 4n, 4n + 1, 4n + 2, 4n + 3 (n: positive integer). The target TSP may be considered. By checking the TSP type of the TSP counter value to be deleted for each of these four deletion criterion TSP counter values, the minimum deletion amount among the four deletion criteria is determined in advance. be able to. For example, when a TSP with a TSP counter value of 4n is used as a reference TSP to be deleted, the broadcast TS packet to be deleted is not a null packet, but is a TSP counter value that is a TSP of the A layer / B layer. The TSP of the TSP counter value is deleted. If the subsequent TSP is also in the A layer or the B layer, the TSP of the next TSP counter value is further deleted. In this way, only the null packet can be deleted by shifting the TSP counter value. However, the maximum value of the TSP amount to be shifted becomes the size of the TS buffer and becomes the delay amount as it is. Therefore, it is possible to grasp the delay amount when the TSP having the TSP counter value of 4n is set as the TSP to be deleted. Similarly, it is possible to grasp the respective delay amounts when the TSP having the TSP counter values 4n + 1, 4n + 2, and 4n + 3 is set as the TSP to be deleted. Therefore, an extraction TSP table having a minimum delay amount can be created by selecting in advance one of the four deletion criteria that minimizes the amount of TSP to be shifted.

  Specifically, the broadcast TS arrangement in FIG. 8 (mode 1, guard interval 1/4, layer A QPSK (coding rate 2/3), layer B 16QAM (coding rate 1/2)) will be described as an example. First, let us consider a case where it is assumed that the TSP counter value to be deleted is deleted based on the TSP corresponding to 4n + 1. From FIG. 8, the TSP type with a TSP counter value of 1 (n = 0) is a null packet and can be deleted. On the other hand, since the TSP type with a TSP counter value of 17 (n = 4) is a TSP of the B layer, if the next TSP counter value is checked without deleting it, the TSP type with the TSP counter value of 18 becomes a null packet. Is deleted. At this time, the shift amount is one packet.

  Further, since the TSP type with a TSP counter value of 37 (n = 9) is the TSP of the A layer, when the next TSP is examined, it becomes the TSP of the B layer. Therefore, the TSP counter value of the TSP to be deleted is 39, and the shift amount is 2 packets. As a result of the confirmation, assuming that the TSP counter value to be deleted is 4n + 1, the maximum shift amount is 2 packets. The TS buffer amount may be set to 2 packets. Even if the TSP counter value to be deleted is 4n, 4n + 2, the maximum shift amount is 2 packets. On the other hand, assuming that the TSP counter value to be deleted is 4n + 3, the maximum shift amount is one packet. Therefore, if the TSP counter value to be deleted from this transmission parameter is based on 4n + 3, the delay amount can be shortened. An example of the extracted TSP table created by the above procedure is shown in FIG. As described above, even if four deletion criteria are assumed, if the maximum shift amount is the same, any of them may be selected. For example, it is preferable to select one having a small number of shifts.

  In the above manner, the extracted TSP table is converted into transmission parameters, that is, 3 (mode) × 4 (guard interval ratio) × 3 (A layer modulation scheme / inner code) × 3 (B layer modulation scheme / inner code) = 108 tables can be created.

  In addition, when transmitting in the same way as terrestrial digital television broadcasting and multimedia broadcasting using the VHF-High band, the broadcast TS includes transmission parameters such as A layer TSP, B layer TSP, and null packet. There is an invalid hierarchical TSP that multiplexes IIP, TM data, and carrier-specific data indicating TMCC information. The multiple positions of these data are not defined by the standard. In the present embodiment, the first additional information A, the second additional information B, and the third additional information are added according to the content of the additional information so that the TSP scheduled to be deleted may not be the IIP, AC data, and the carrier-specific data. By classifying the information into the information C and changing the multiplexing timing of the first additional information A, the second additional information B, and the third additional information C, it is possible to reduce the processing delay when the broadcast TS is compressed / expanded.

  As described above, the STL / TTL line transmission system according to the present embodiment transmits a concatenated composite TS that is arbitrarily concatenated and combined with a plurality of types of segment-type broadcast TSs with a predetermined number of segments or less, via the STL / TTL line. When monitoring, the TSP counter value of a predetermined segment format broadcast TS among the plurality of types of segment format broadcast TS is monitored, and a null packet of a TSP counter value determined in advance according to the transmission parameter of the broadcast TS is received. Compressed broadcast that is multiplexed by changing the timing of the first additional information A, the second additional information B, and the third additional information C classified according to the content of the additional information while performing data compression on the broadcast TS by deleting A TS is generated, and this compressed broadcast TS is linked to a broadcast TS that is not subjected to data compression among the plurality of types of segment-type broadcast TS. And, generating a consolidated synthesis TS. As a result, a concatenated combined TS can be configured at a predetermined transmission rate (for example, 32.51 Mbps (= 512/63 × 4 Mbps)) or less, and therefore, an STL / TTL line similar to that for terrestrial digital television broadcasting is used. In addition, since the delay of the additional information when the compressed broadcast TS is expanded can be minimized, it is possible to efficiently transmit the broadcast TS and the additional information.

(Receiver for STL / TTL line)
FIG. 10 is a block diagram showing the configuration of the STL / TTL line receiver 10 according to the first embodiment of the present invention. The STL / TTL line receiver 10 of the present embodiment includes an RF receiver 11, an STL / TTL transmission path decoder 12, a compressed broadcast TS of each three-segment format combined with a concatenated combined TS, and each Are provided with a separation unit 13 for separating the one-segment broadcast TS and a data decompression unit 14 provided for each three-segment compressed broadcast TS.

  The RF receiver 11 receives the broadcast wave of the RF signal of the concatenated combined TS transmitted from the STL / TTL line transmitter 1, converts it into an IF signal, and outputs it to the STL / TTL transmission line decoder 12.

  The STL / TTL channel decoding unit 12 performs predetermined channel decoding (for example, similar to ARIB STD-B31) on the transmission channel coded signal of the concatenated combined TS converted into the IF signal, and is demodulated / decoded. The connected combined TS is output to the separation unit 13.

  The separating unit 13 first deletes the null packet added by the combining unit 3 in the STL / TTL line transmission apparatus 1. For example, when one null packet is added for seven TSPs counted from the head of the multiplexed frame in the combining unit 3 in the STL / TTL line transmitter 1, the separating unit 13 also determines the head of the multiplexed frame. After detection, one null packet may be deleted for every eight TSPs.

  Subsequently, the separation unit 13 deletes the null packet, and then separates the three 3-segment format compressed broadcast TS and the two 1-segment format broadcast TS into the separated four 3-segment format compressed broadcasts. Each TS is output to the respective data decompression unit 14, and the separated two one-segment broadcast TSs are output to the outside.

  The data decompression unit 14 inserts a null packet according to the TSP counter value, decompresses the compressed broadcast TS, and outputs it as a three-segment type broadcast TS.

  FIG. 11 is a block diagram showing the configuration of the data decompression unit 14 in the STL / TTL line receiver 10 of the present embodiment. The data decompression unit 14 includes a TSP buffer 15, a TSP counter value extraction unit 16, a null packet generation unit 17, and a null packet insertion unit 18. The three-segment compressed broadcast TS is input to the TSP buffer 15 and the TSP counter value extraction unit 16, respectively.

  The TSP buffer 15 has a function of temporarily storing the TSP in the inputted compressed broadcast TS of the three segment format, and the TSP is read according to the TSP counter value under the control of the null packet insertion unit 18 described later.

  The TSP counter value extraction unit 16 extracts the TSP counter value in the first additional information A and sends it to the null packet insertion unit 18.

  The null packet generation unit 17 generates a null packet in response to a null packet insertion request from the null packet insertion unit 18 and outputs the null packet to the null packet insertion unit 18.

  The null packet insertion unit 18 reads the TSP in order from the TSP buffer 15 when the TSP counter value is a continuous value, and the TSP counter value is a continuous value when the TSP counter value is not a continuous value and there is an omission. The necessary amount of null packets is inserted from the null packet generator 17 until the broadcast TS is restored. In the present embodiment, since the second additional information B and the third additional information C are multiplexed after the three-segment broadcast TS is compressed, the broadcast TS can be restored without changing the position of the additional information. There is no need to hold the extracted TSP table used on the transmission side.

  Thereby, the compressed broadcast TS of 6.10 Mbps (= 512/63/4 × 3 Mbps) is converted into the broadcast TS of 8.12 Mbps (= 512/63 Mbps).

  In this way, the STL / TTL line receiving apparatus 10 of the present embodiment uses the STL / TTL line to combine and combine the combined TSs that are arbitrarily concatenated and combined with a plurality of types of segment-type broadcast TSs within a predetermined number of segments. When receiving, the concatenated composite TS including the compressed broadcast TS is separated, the TSP counter value of the compressed broadcast TS is monitored, and a null packet having a predetermined TSP counter value is inserted to thereby determine the compressed broadcast TS. Data is decompressed and the original broadcast TS is restored.

  With the above configuration, a combined synthesis TS of VHF-Low band multimedia broadcasting composed of four three-segment broadcasting TSs and two one-segment broadcasting TSs is an STL / TTL of terrestrial digital television broadcasting. It can be transmitted over one line.

[Second Embodiment]
Next, a transmission system for an STL / TTL line according to a second embodiment of the present invention will be described. In the first embodiment, since the extraction TSP table is set for each transmission parameter, 108 tables are required. In the second embodiment, an example will be described in which an extracted TSP table is used in which the number of extracted TSP tables is reduced to 12 (only the combination of mode and guard interval ratio) while minimizing an increase in delay time. Each configuration of the STL / TTL line transmission apparatus 1, the TS remultiplexing apparatuses 6 and 7, the additional information insertion control apparatus 8, and the STL / TTL line reception apparatus 10 relating to the STL / TTL line transmission system in the second embodiment. Since this is the same as that of the first embodiment, a method of creating an extracted TSP table corresponding to transmission parameters for reducing the number of extracted TSP tables will be described by taking mode 3 and guard interval 1/8 as an example.

(Extraction TSP table creation method according to transmission parameters in the second embodiment)
Specifically, a method for creating an extracted TSP table according to transmission parameters stored in advance in the extracted TSP table storage unit 93a will be described. As in the first embodiment, in consideration of shortening the delay amount as the TSP to be deleted, any one of four types of TSP counter values 4n, 4n + 1, 4n + 2, 4n + 3 (n: a positive integer) is selected. It can be considered that the TSP to be deleted is based on the TSP possessed. By checking the TSP type of the TSP counter value to be deleted for each of these four deletion criterion TSP counter values, the minimum deletion amount among the four deletion criteria is determined in advance. be able to.

  At this time, there are nine transmission parameters having the same mode / guard interval ratio combination, because there are three combinations of modulation schemes and inner codes in the A / B layer. Therefore, nine types of TSP having the same TSP counter value are checked. FIG. 12 shows TSP types with TSP counter values from 0 to 39. If there is at least one TSP of A layer / B layer among TSPs of TSP counter values to be deleted, the TSP of the next TSP counter value is deleted (example: TSP counter value in FIG. 12). = 5). Further, if there is a TSP of the A layer or the B layer for the subsequent TSP, the TSP of the next TSP counter value is further set, and this is repeated. For example, when the TSP counter value = 20 in FIG. 12, the null packet with the TSP counter value = 23 shifted by 3 packets is deleted.

  As described above, only the null packet can be deleted by shifting the TSP counter value. However, as in the first embodiment, the maximum value of the TSP amount to be shifted becomes the size of the TS buffer, and the delay amount as it is. It becomes. For this reason, the TSP counter value to be shifted is selected from the four TSP counter values. In the case of mode 3 and guard interval 1/8, the delay amount is 4 packets for 4n, 4n + 1, and 4n + 2, whereas if the extracted TSP table is created based on 4n + 3, the delay amount is 2 packets. can do.

  As described above, the same operation as that of the STL / TTL line transmission system and the STL / TTL line receiving apparatus 10 of the first embodiment can be realized with the number of extracted TSP tables reduced. it can.

  Next, in the STL / TTL line transmission system and the STL / TTL line receiving apparatus 10 according to the first or second embodiment of the present invention, the 3 segment format is composed of m pieces and the 1 segment form is composed of k pieces. The rate adjustment by inserting a null packet in the case of As described above, the three-segment broadcast TS is converted into the compressed broadcast TS by the data compression unit 2 and the total transmission speed of the three-segment compressed TS and the one-segment broadcast TS input to the combining unit 3 Is 512/63/4 × (3m + k) Mbps. Here, 3m + k is equal to the number of transmission segments. Therefore, in order to obtain the same transmission rate as the broadcasting TS of the digital terrestrial television broadcasting in the synthesizing unit 3, the transmission rate is 16 / (3m + k) times, that is, 16-3m-k per 3m + k TSPs. Insert null packets. As a result, it is possible to transmit a concatenated combined TS having a constant transmission rate with an arbitrary segment structure.

  In the STL / TTL line transmission system of the first embodiment or the second embodiment, predetermined additional information is classified into three types of additional information, and individually multiplexed on the broadcast TS and the compressed broadcast TS, The point that the receiving side can minimize the delay when the compressed broadcast TS is expanded will be described in detail based on a comparative example.

(Comparative example)
VHF-Low band VHF-Low band that consists of up to 14 segments as a technique that can use STL / TTL lines equivalent to terrestrial digital broadcasting, using the above-mentioned format of terrestrial digital broadcasting using broadcast terrestrial broadcasting. In order to compress the data of a three-segment broadcast TS so that the composite TS of the multimedia broadcast is less than or equal to the broadcast TS of the terrestrial digital broadcast (32.51 Mbps (= 512/63 × 4 Mbps) or less) A description will be given of an example in which, when the TSP to be deleted is IIP, AC data, and carrier-specific data, the NSP is rewritten with a null packet in the same multiplexed frame after the TSP.

  FIG. 13 is a block diagram showing a configuration of an STL / TTL line transmitting apparatus 50 of a comparative example. FIG. 14 is a block diagram showing a configuration of the data compression unit 2 in the STL / TTL line transmission apparatus 50 of the comparative example. FIG. 15 is a block diagram showing a configuration of the data decompression unit 14a in the STL / TTL line receiver 10 of the comparative example.

  In FIG. 13, the STL / TTL line transmission apparatus 50 of the comparative example is included in a three-segment broadcast TS so that the transmission speed of the composite TS is equal to or less than the broadcast TS of terrestrial digital broadcasting regardless of the segment configuration. A device having a function of deleting a null packet and converting it into a compressed broadcast TS, a data compression unit 2, a synthesis unit 3, an STL / TTL transmission path encoding unit 4, and an RF (Radio Frequency) transmission unit 5 With. Compared with the STL / TTL line transmitting apparatus 1 according to the present invention shown in FIG. 1, the STL / TTL line transmitting apparatus 50 shown in FIG. 13 is an alternative to the data compression / additional information multiplexing unit 9 according to the present invention. 2 is different in that it includes a data compression unit 2 that compresses data of a three-segment broadcast TS in which all of the additional information belonging to the first additional information A and the second additional information B among the predetermined additional information shown in FIG. .

  In the STL / TTL line transmission apparatus 50 shown in FIG. 13, the data compression unit 2 converts the broadcast TS of 8.12 Mbps (= 512/63 Mbps) to the compressed broadcast TS of 6.10 Mbps (= 512/63/4 × 3 Mbps). The data is compressed and output to the synthesis unit 3. However, it is assumed that all of the additional information belonging to the first additional information A and the second additional information B among the predetermined additional information shown in FIG.

  The synthesizing unit 3 synthesizes the four input compressed broadcast TSs in the three-segment format and the two one-segment format broadcast TSs, and one concatenation having a constant transmission speed by adjusting the rate by adding a null packet. A combined TS is generated and output to the STL / TTL transmission line encoding unit 4.

  The STL / TTL transmission path encoding unit 4 performs predetermined transmission path encoding (for example, similar to ARIB STD-B31) on the concatenated combined TS, generates an IF signal, and sends the IF signal to the RF transmission unit 5 .

  The RF transmission unit 5 converts the IF signal of the concatenated combined TS subjected to transmission path encoding into an RF signal having a predetermined frequency, generates a broadcast wave, and sends it out.

  Here, as shown in FIG. 14, the data compression unit 2 in the STL / TTL line transmission device 50 of the comparative example includes a TSP buffer 21, an additional information extraction unit 22, an extraction TSP table selection control unit 23, and an extraction TSP table storage. And a TSP extraction unit 24.

  The TSP buffer 21 has a function of temporarily storing broadcast TS packets (TSP) in the input three-segment broadcast TS, and a TSP having a predetermined TSP counter value is read out under the control of the TSP extraction unit 24 described later. .

  The additional information extraction unit 22 extracts the additional information included in the IIP in the invalid layer TSP of the broadcast TS or the dummy byte portion of each TSP, and the extracted TSP table selection control unit 23 for a predetermined transmission parameter included in the additional information. The TSP counter value included in the additional information is sent to the TSP extraction unit 24. Here, when the additional information extraction unit 22 once extracts the transmission parameter from the IIP and sends it to the extraction TSP table selection control unit 23 for the broadcast TS, the TSP counter included in the dummy byte portion of each TSP. Only the value may be extracted and sent to the TSP extraction unit 24.

  The extraction TSP table selection control unit 23 uses the additional information extraction unit 22 from the extraction TSP table storage unit 23a that stores in advance a plurality of extraction TSP tables (similar to FIGS. 9 and 12 described above) according to transmission parameters. An extracted TSP table that matches the extracted transmission parameters is selected and read, and output to the TSP extraction unit 24.

  The TSP extraction unit 24 refers to the TSP counter value in the additional information output from the additional information extraction unit 22 and the extracted TSP table output from the extraction TSP table selection control unit 23, and performs compressed broadcast from the TSP buffer 21. Read and output TSP extracted as TS. As a result, a broadcast TS of 8.12 Mbps (= 512/63 Mbps) is converted into a compressed broadcast TS of 6.10 Mbps (= 512/63/4 × 3 Mbps).

  As described above, in the STL / TTL line transmission device 50 of the comparative example, the broadcast TS in the 3-segment format is input to the data compression unit 2, and the extracted TSP table is selected according to the transmission parameter read by the additional information extraction unit 22. The control unit 23 selects the extracted TSP table stored in the extracted TSP table storage unit 23a. Thereafter, the TSP extraction unit 24 extracts the TSP in accordance with the selected extraction TSP table to generate a compressed broadcast TS. In this comparative example, the input 3-segment broadcast TS includes all information of the additional information belonging to the first additional information A and the second additional information B transmitted by dummy bytes of each TSP and IIP. On the other hand, a null packet having a TSP counter value corresponding to the transmission parameter is deleted during data compression in the data compression unit 2. If the TSP for multiplexing the additional information is determined in advance, when the extracted TSP table is determined, the TSP on which the additional information is multiplexed is handled in the same way as the TSP of the A layer and the B layer, so that the additional information is compressed. Although not deleted, the additional information includes information such as AC data for which a multiple TSP has not been determined in advance.

  Therefore, in this comparative example, when the TSP scheduled to be deleted becomes IIP, AC data, and carrier-specific data, the additional information is transmitted without being lost by rewriting the null packet in the same multiplexed frame after the TSP. It needs to be possible. For this reason, when the technique of this comparative example is used, if additional information is multiplexed at the packet position to be deleted, the multiplexing position is changed by compression. Will occur.

  Furthermore, the STL / TTL line receiving device 10 of the comparative example that receives the broadcast wave transmitted from the STL / TTL line transmitting device 50 of the comparative example is the same as that shown in FIG. The data decompression unit 14 shown in FIG. 10 needs to have the configuration of the data decompression unit 14a shown in FIG.

  In FIG. 15, the data decompression unit 14a includes a TSP buffer 15a, an additional information extraction unit 16a, a null packet generation unit 17a, a TSP output control unit 18a, an extraction TSP table selection control unit 19, and an extraction TSP table storage unit. 19a. The compressed broadcast TS in the three segment format is input to the TSP buffer 15a and the additional information extraction unit 16a, respectively.

  The TSP buffer 15a has a function of temporarily storing a TSP in the inputted compressed broadcast TS of the three segment format, and a TSP having a predetermined TSP counter value is read out under the control of a TSP output control unit 18a described later.

  The additional information extraction unit 16a extracts the IIP in the invalid layer TSP of the broadcast TS and the additional information included in the dummy byte portion of each TSP, and the extracted TSP table selection control unit 19 for a predetermined transmission parameter included in the additional information. The TSP counter value included in the additional information is sent to the null packet generator 17a and the TSP output controller 18a. Here, when the additional information extraction unit 16a once extracts the transmission parameter from the IIP and sends it to the extraction TSP table selection control unit 18a for the compressed broadcast TS, the TSP included in the dummy byte portion of each TSP. Only the counter value may be extracted and sent to the null packet generator 17a and the TSP output controller 18a.

  The extraction TSP table selection control unit 19 includes an extraction TSP table storage unit 19a that stores in advance a plurality of extraction TSP tables corresponding to the same transmission parameters as the data compression unit 2 in the STL / TTL line transmission device 50 of the comparative example. Then, the extracted TSP table that matches the transmission parameter extracted by the additional information extracting unit 16a is selected and read, and output to the null packet generating unit 17a.

  The null packet generation unit 17a generates a null packet by referring to the TSP counter value in the additional information output from the additional information extraction unit 16a and the extracted TSP table output from the extraction TSP table selection control unit 19. To the TSP output control unit 18a.

  The TSP output control unit 18a reads the TSP in the compressed broadcast TS from the TSP buffer 15a based on the TSP counter value in the additional information output from the additional information extraction unit 16a, and the null packet from the null packet generation unit 17a. Is inserted to restore the broadcast TS.

  In this way, in the decompression unit 14a of the comparative example, compared with the data decompression unit 14 shown in FIG. 11 according to the present invention, in this comparative example, the TSP scheduled to be deleted is the IIP, AC data, and operator-specific data. In this case, the additional information extraction unit 16a that enables rewriting with a null packet in the same multiplex frame after the TSP, and the extraction TSP table selection control unit 19 for control related to the extraction TSP table shared with the transmission side. And the extracted TSP table storage unit 19a is required.

  On the other hand, in the STL / TTL line transmission system and the STL / TTL line receiving apparatus 10 according to the first embodiment or the second embodiment of the present invention, the second addition is performed after the three-segment broadcast TS is compressed. Since the information B is multiplexed, the broadcast TS can be restored without changing the position of the additional information, and there is an advantage that it is not necessary to hold the extracted TSP table used on the transmission side.

  Next, an STL / TTL line transmission system, an STL / TTL line transmission apparatus, a TS remultiplexing apparatus, an additional information insertion control apparatus, and an STL / TTL line reception apparatus according to a third embodiment of the present invention will be described.

[Third Embodiment]
(Transmission system for STL / TTL lines)
FIG. 16 is a block diagram showing the configuration of the STL / TTL line transmission system according to the third embodiment of the present invention. In FIG. 16, components corresponding to those shown in FIG. 1 are denoted by the same reference numerals. The STL / TTL line transmission system of the third embodiment includes an additional information insertion control device 8a instead of the additional information insertion control device 8, and each 3seg TS remultiplexing device 6 includes an additional information insertion control unit. 62, each Seg TS remultiplexing device 7 is configured to include an additional information insertion control unit 72, and is different from the STL / TTL line transmission system of the first embodiment shown in FIG. . The other components shown in FIG. 16 operate in the same manner as the STL / TTL line transmission system of the first embodiment shown in FIG. The STL / TTL line transmitter 1 and the STL / TTL line receiver 10 in the third embodiment are the same as the STL / TTL line transmitter 1 and the STL / TTL line receiver 10 in the first embodiment. Since it is configured and operates in the same manner, the description thereof is omitted. Therefore, the additional information insertion control unit 62 included in each 3seg TS remultiplexing device 6, the additional information insertion control unit 72 included in each 1seg TS remultiplexing device 7, and the additional information insertion control device 8a will be described in detail. .

  Referring to FIG. 16, the STL / TTL line transmission system of this embodiment classifies the STL / TTL line transmission apparatus 1 and the three-segment TS from the predetermined additional information illustrated in FIG. The 3seg TS remultiplexers 6a-1, 6a-2, 6a-3, 6a-4 for multiplexing the first additional information A thus formed to form a three-segment broadcast TS, and the one-segment TS 1seg TS remultiplexing devices 7a-1 and 7a-2 for multiplexing the information belonging to the first additional information A and the second additional information B among the predetermined additional information to form a one-segment broadcast TS, And an additional information insertion control device 8a.

  The 3seg TS remultiplexers 6a-1, 6a-2, 6a-3, and 6a-4 are devices that perform TS remultiplex processing for each unit transmission wave. The TS re-multiplexing unit 61 that multiplexes the first additional information A classified from the information to form and output a three-segment broadcast TS, and the third additional information classified from the predetermined additional information for the three-segment TS. The 1 additional information A is inserted into the TS remultiplexing unit 61 and the second additional information B classified from the predetermined additional information is sent to the data compression / additional information multiplexing unit 9 in the STL / TTL line transmission apparatus 1 And an information insertion control unit 62.

  The 1seg TS remultiplexers 7a-1 and 7a-2 are devices that perform TS remultiplex processing for each unit transmission wave, and each of the predetermined additional information illustrated in FIG. Of these, the TS re-multiplexing unit 71 that multiplexes information belonging to the first additional information A and the second additional information B to form and output a broadcast TS of one segment format, and the predetermined addition to the one segment format TS An additional information insertion control unit 72 that inserts information belonging to the first additional information A and the second additional information B among the information into the TS remultiplexing unit 71 is provided.

  The additional information insertion control device 8a includes an additional information insertion control unit 82a. The additional information insertion control unit 82a outputs third additional information C to be multiplexed in common when generating the combined synthesis TS with respect to the 3 segment format signal and the 1 segment format signal. The location where the third additional information C is multiplexed is the same as in the first embodiment, and a description thereof is omitted.

  As a result, the STL / TTL line transmission system of the third embodiment transmits a digital broadcasting signal by a segment connection method such as VHF-Low band multimedia broadcasting from a performance station to a transmission station (STL) in the form of a broadcast TS. When transmitting from a location to a transmission location (TTL), a predetermined number of three-segment broadcast TSs and a predetermined number of one-segment broadcast TSs are multiplexed and generated to generate a total of 14 segments of combined composite TS Furthermore, since each data compression / additional information multiplexing unit 9 can multiplex the second additional information B after data compression, the same effect as in the first embodiment can be obtained. Further, the STL / TTL line transmitter 1 in the third embodiment can use the same extracted TSP table as in the first embodiment.

  The present invention has been described above with reference to specific embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the technical idea thereof. For example, in each of the above-described embodiments, in the STL / TTL line transmitter 1, the extracted TSP table indicating the TSP counter value of the TSP extracted as the compressed broadcast TS (that is, the TSP counter value of the TSP not deleted in the broadcast TS). Although an example of holding was described, instead of this, an extracted TSP table indicating a TSP counter value of a TSP to be deleted to be configured as a compressed broadcast TS may be held. In the above-described embodiment, the TS remultiplexing device is distinguished from the 3seg TS remultiplexing device 6 and the 1seg TS remultiplexing device 7. However, in general, the TS remultiplexing device uses three-segment broadcasting. The first TS remultiplexing unit 61 that multiplexes the first additional information A for the TS, and the first information that belongs to the classification of the first additional information A and the second additional information B for the broadcast TS of one segment format are multiplexed. What is necessary is just to comprise so that either one or both of 2 TS remultiplexing parts 71 may be provided. Here, in the TS remultiplexing device configured to include both the first TS remultiplexing unit 61 and the second TS remultiplexing unit 71, a functional block similar to the segment format determination unit 81 described above is provided, It can be configured to determine whether the broadcast TS is a three-segment format or a one-segment format, and multiplex additional information classified in advance according to the segment format.

  According to the present invention, in a transmission signal arbitrarily connected and synthesized with a predetermined number of segments or less for a plurality of types of segment-type broadcast TS, for example, in a multimedia broadcast transmission signal connected with 14 or less segments, Regardless of (1-segment format or 3-segment format), a concatenated combined TS can be configured at a predetermined transmission rate (for example, 32.51 Mbps (= 512/63 × 4 Mbps)) or less. This is useful for applications using similar STL / TTL lines.

DESCRIPTION OF SYMBOLS 1 Transmission apparatus for STL / TTL line 2 Data compression part of comparative example 3 Combining part 4 STL / TTL transmission line coding part 5 RF transmission part 6,6-1, 6-2, 6-3, 6-4 3seg TS remultiplexer 6a-1,6a-2,6a-3,6a-4 3seg TS remultiplexer 7,7-1,7-2 1seg TS remultiplexer 7a-1,7a-2 1seg TS remultiplexing device 8, 8a Additional information insertion control device 9, 9-1, 9-2, 9-3, 9-4 Data compression / additional information multiplexing unit 10 STL / TTL line receiving device 11 RF receiving unit 12 STL / TTL transmission line decoding unit 13 Separation unit 14 Data expansion unit 14a Data expansion unit of comparative example 15 TSP buffer 15a TSP buffer of comparative example 16 TSP counter value extraction unit 16a Additional information extraction unit of comparative example 17 Null packet 17a Null packet generation unit 18 Null packet insertion unit 18a TSP output control unit 19 Comparative example extraction TSP table selection control unit 19a Comparative example extraction TSP table storage unit 21 Comparative example TSP buffer 22 Additional Information Extraction Unit of Comparative Example 23 Extraction TSP Table Selection Control Unit of Comparative Example 23a Extraction TSP Table Storage Unit of Comparative Example 24 TSP Extraction Unit of Comparative Example 31-1, 31-2, 31-3, 31-4 Addition Information adding unit 32-1 and 32-2 Additional information adding unit 33 TS combining unit 34 Null packet generating unit 35 Rate adjusting unit 50 STL / TTL line transmission device 61 of comparative example 61 TS remultiplexing unit 62 Additional information insertion control unit 71 TS remultiplexing unit 72 Additional information insertion control unit 81 Segment format determination unit 82, 82a Additional information insertion control unit 91 TSP buffer 92 TSP counter value extraction unit 93 Extraction TSP table selection control unit 93a Extraction TSP table storage unit 94 TSP extraction unit 95 Additional information multiplexing unit

Claims (10)

A transmission system for an STL / TTL line that transmits a combined composite TS that is arbitrarily connected and combined with a predetermined number of segments or less for a plurality of types of segment-type broadcast TSs via an STL / TTL line,
By monitoring the TSP counter value of a broadcast TS of a predetermined segment format among the plurality of types of segment TS, and deleting the null packet of the TSP counter value determined in advance according to the transmission parameter of the broadcast TS A compressed broadcast TS that has been subjected to data compression is generated for the broadcast TS, and a combined composite TS is generated by connecting the compressed broadcast TS and a broadcast TS that has not been subjected to data compression. STL / TTL line transmission means for performing transmission path encoding and transmitting the data to the outside via an STL / TTL line;
The additional information related to the TSP of the broadcast TS is set as the first additional information, the information that is changed as needed by each operator and the additional information transmitted by the IIP are classified as the second additional information, and data compression is performed for the compressed broadcast TS. Additional information insertion control means for multiplexing the first additional information on the broadcast TS to be compressed before performing the data compression, and multiplexing the second additional information on the compressed broadcast TS after performing the data compression;
A transmission system for an STL / TTL line, comprising:   The transmission means for the STL / TTL line transmits the plurality of additional information classified as information related to concatenated transmission among the additional information multiplexed on the broadcast TS of the plurality of types of segments when the concatenated composite TS is generated. The transmission system for an STL / TTL line according to claim 1, further comprising combining means for multiplexing and combining each of the broadcast TSs of various segment formats. A transmission device for STL / TTL lines that transmits a combined composite TS that is arbitrarily connected and combined with a predetermined number of segments or less of a plurality of types of segment-type broadcast TSs via an STL / TTL line,
Of the additional information multiplexed on the broadcast TS of the plurality of types of segments, the additional information related to the TSP of the broadcast TS is the first additional information. Additional information that is changed as needed by each operator and additional information transmitted by IIP Is the second additional information, and the additional information related to the linked transmission is classified in advance as the third additional information,
The TSP counter value of a broadcast TS of a predetermined segment format in which the one additional information is multiplexed among the plurality of types of segment format broadcast TS is monitored, and a TSP counter value determined in advance according to the transmission parameter of the broadcast TS Data compression / additional information multiplexing means for performing data compression on the broadcast TS by deleting the null packet to generate a compressed broadcast TS, and multiplexing the second additional information after the data compression,
Combining means for concatenating the compressed broadcast TS and the broadcast TS not subjected to the data compression among the plurality of types of segment-format broadcast TS, and generating a combined composite TS to which the third additional information is added,
Transmitting means for applying a predetermined transmission line encoding to the concatenated combined TS and transmitting the same to the outside via an STL / TTL line;
A transmitter for an STL / TTL line, comprising:   The null packet of the predetermined TSP counter value to be deleted is predetermined so as to minimize the delay amount of the broadcast TS according to the transmission parameter. STL / TTL line transmitter.   The synthesizing means does not depend on the segment configuration by arbitrarily connecting the broadcast TSs of the plurality of segment formats, and the transmission rate of the concatenated combined TS becomes a constant transmission rate that can be transmitted through the STL / TTL line. The STL / TTL line transmitting apparatus according to claim 3 or 4, further comprising means for inserting a null packet. A TS remultiplexing device that multiplexes additional information predetermined according to the segment format and generates a broadcast TS for a plurality of types of segment format broadcast TSs,
Of the additional information multiplexed on the broadcast TS of the plurality of types of segments, the additional information related to the TSP of the broadcast TS is the first additional information. Additional information that is changed as needed by each operator and additional information transmitted by IIP Are classified in advance as second additional information,
Of the plurality of types of segment-type broadcast TSs, three-segment type broadcast TSs include a first TS re-multiplexing unit that multiplexes the first additional information, and one segment type of the plurality of types of segment-type broadcast TSs. A TS remultiplexing apparatus comprising one or both of a second TS remultiplexing unit that multiplexes additional information belonging to the classification of the first additional information and the second additional information for the broadcast TS. An additional information insertion control device for generating a broadcast TS by multiplexing additional information predetermined according to the segment format for a plurality of types of segment format broadcast TS,
Of the additional information multiplexed on the broadcast TS of the plurality of types of segments, the additional information related to the TSP of the broadcast TS is the first additional information. Additional information that is changed as needed by each operator and additional information transmitted by IIP Are classified in advance as second additional information,
The first additional information is multiplexed for the three-segment broadcast TS among the plurality of types of segment-type broadcast TS, and the first segment information for the one-segment broadcast TS of the plurality of types of segment-type broadcast TS. An additional information insertion control device comprising: an additional information insertion control unit that controls to multiplex additional information and additional information belonging to the second additional information classification. A STL / TTL line receiving apparatus for receiving a combined composite TS that is arbitrarily concatenated and combined within a predetermined number of segments with respect to a plurality of types of segment format broadcast TSs, via an STL / TTL line,
On the transmission side, data compression is performed by deleting a null packet of a TSP counter value determined in advance according to a transmission parameter of the broadcast TS for the broadcast TS of a predetermined segment format among the plurality of types of segment format broadcast TSs. A combined composite TS obtained by concatenating and combining the applied compressed broadcast TS and the broadcast TS that is not subjected to the data compression among the plurality of types of segment format broadcast TS is separated into the plurality of types of segment format broadcast TS. Separating means to
The TSP counter value of the compressed broadcast TS is monitored. When the TSP counter value is a continuous value, the TSP is connected in the order in which the compressed broadcast TS is separated, and when the TSP counter value is not a continuous value, the TSP counter value is Data decompression means for inserting a null packet and restoring the broadcast TS until becomes a continuous value;
An STL / TTL line receiving apparatus, comprising:   9. The null packet of the predetermined TSP counter value to be deleted is predetermined so that the delay amount of the broadcast TS is minimized according to the transmission parameter. STL / TTL line receiver.   The said demultiplexing means is provided with a means to delete the null packet inserted so that it might become the fixed transmission rate which can be transmitted on the said STL / TTL line | wire on the transmission side, The said Claim 9 or 9 characterized by the above-mentioned. STL / TTL line receiver.