Transmitting device and receiving device

Abstract

To provide a transmitting device 2 capable of simultaneously transmitting, by 16APSK, broadcasting contents for real-time broadcasting and accumulated broadcasting via satellite broadcasting 3 using only right-handed circular polarization, and a receiving device 4 thereof.SOLUTION: A transmitting device 2 of the present invention converts a broadcast content file for accumulated broadcasting separately from real-time broadcasting TLV in a satellite broadcasting system 1 conforming to the ISDB-S3 standard into accumulated broadcasting TLV that makes a broadcast signal for accumulated broadcasting by performing packet division according to a transmission control signal, forms a single series of composite TLV stream time-division multiplexed for transmission by one satellite repeater in a broadcasting satellite 3, generates a 16APSK modulated signal to generate a right-handed circularly polarized uplink signal, and transmits the same as a satellite broadcast signal to the broadcasting satellite 3 using a transmitting antenna 2a. A receiving device 4 of the present invention receives the right-handed circularly polarized satellite broadcast signal via the broadcasting satellite 3, and simultaneously receives broadcast contents for real-time broadcasting and accumulated broadcasting.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a transmitting device capable of simultaneously transmitting broadcast content for real-time broadcasting and broadcast content for stored broadcasting via satellite broadcasting, and a receiving device thereof. [Background technology]

[0002] The current satellite broadcasting, which has been digitalized since the year 2000, uses radio waves in the 12 GHz band, and the 12 GHz satellite broadcasting signal is received by a satellite broadcasting receiving antenna, then sent to a home distribution system using a coaxial cable and transmitted to a receiving device. For stable reception and transmission, a converter (LNB: Low noise block converter) is provided for the satellite broadcasting receiving antenna, which converts the broadcasting frequency of the satellite broadcasting signal to the intermediate frequency (IF) band.

[0003] In addition, satellite broadcasting transmitted from a geostationary orbit at 110 degrees east longitude currently includes BS digital broadcasting (hereafter abbreviated as "BS") and broadband CS digital broadcasting (hereafter abbreviated as "CS").

[0004] To briefly explain the history of satellite broadcasting services, conventional satellite broadcasting services (BS / CS) used radio waves in the 11.70 to 12.75 GHz (12 GHz band), and only right-hand circular polarization (hereinafter referred to as "right-hand") was used.

[0005] Then, in 2018, Japan became the first country in the world to start a satellite broadcasting service (hereafter abbreviated as "new 4K8K satellite broadcasting") capable of transmitting super high-definition (4K / 8K) broadcasting content consisting of ultra-high definition video and 22.2 multi-channel 3D sound. This new 4K8K satellite broadcasting also began using left-handed circularly polarized waves (hereafter abbreviated as "left-handed"). Because right-handed and left-handed circular polarization are orthogonal to each other, left-handed circular polarization can transmit different broadcasting content at the same frequency as right-handed circular polarization, allowing for more efficient use of frequencies.

[0006] The new 4K8K satellite broadcasting uses the new satellite transmission method ISDB-S3. ISDB-S3 is specified in the ARIB standard STD-B44, and in practical form, the modulation method uses 16APSK (Amplitude Phase Shift Keying), which has expanded the transmission capacity of one satellite repeater to 100Mbps.

[0007] These satellite broadcasting services can simultaneously broadcast multiple broadcast contents using one synthetic TLV stream that is time-division multiplexed in units called slots using one satellite repeater. In ISDB-S3 specifications, one frame is divided into 120 slots as one synthetic TLV stream transmitted using one satellite repeater, and multiple broadcast contents can be assigned in units of 5 slots.

[0008] However, among the new 4K8K satellite broadcasting, 8K satellite broadcasting occupies one left-hand circular polarization satellite repeater, i.e., it uses 120 slots, and its transmission capacity is 100Mbps.

[0009] Meanwhile, in the 4K satellite broadcasting of the new 4K8K satellite broadcasting, multiple broadcast contents are provided simultaneously by one satellite repeater, and one broadcast content uses 40 slots, meaning that one satellite repeater can transmit up to three broadcast contents simultaneously as 4K satellite broadcasting. 4K satellite broadcasting is carried out in both right- and left-handed circular polarization.

[0010] However, these satellite broadcasting services use the 12GHz band, which causes large attenuation in coaxial cables, making it difficult to transmit the signal at the original frequency to homes. For this reason, the signal is converted to an intermediate frequency (IF) by a converter in the satellite broadcasting receiving antenna, and the ARIB standard STD-B63 specifies the desirable IF band (see, for example, Non-Patent Document 1).

[0011] More specifically, 1032.23MHz to 2070.25MHz is desirable for right-handed IF, and 2224.41MHz to 3223.25MHz for left-handed IF, and thus the left-handed IF is set to a higher frequency than the right-handed IF. Therefore, a conventional home distribution system for right-handed IF cannot receive left-handed satellite broadcasts. In other words, since 8K satellite broadcasts are broadcast only in left-handed circular polarization, in order to watch 8K satellite broadcasts, it is necessary to introduce a new home distribution system compatible with left-handed IF.

[0012] One way to solve this problem would be to broadcast 8K satellite broadcasting in real time using right-hand rotation, which would allow the use of conventional home distribution systems. However, since the transmission capacity of 8K satellite broadcasting is 100Mbps and it occupies one satellite repeater, it would be necessary to reserve one right-hand rotation satellite repeater for 8K satellite broadcasting. However, all right-hand rotation satellite repeaters are in use for transmitting existing broadcast content, and there are no available ones, making this a little impractical.

[0013] Alternatively, if 32APSK is used as the modulation method, the transmission capacity per satellite repeater can be expanded to about 1.2 times that of 16APSK, and up to four broadcast contents can be transmitted simultaneously for 4K satellite broadcasting. In addition, by reorganizing the channel allocation of the satellite repeater, a right-handed satellite repeater can be secured for 8K satellite broadcasting. However, by increasing the number of values ​​from 16APSK to 32APSK, the required C / N increases and the rainfall margin decreases, making this less feasible. In particular, a typical satellite broadcast receiving antenna with an aperture diameter of 45 cm cannot ensure a sufficient service availability rate for satellite broadcast reception.

[0014] For this reason, a new technique is needed that enables the transmission and reception of 8K satellite broadcasting content via satellite broadcasting using only right-handed circularly polarized waves with 16APSK.

[0015] For example, a receiving device is known that uses TLV (Type Length Value) to download broadcast content for storage broadcasting using a satellite broadcast transmission path via a broadcast satellite (see, for example, Non-Patent Document 2).

[0016] Also, a receiving device has been disclosed that enables data corresponding to broadcast content previously broadcast via terrestrial or satellite waves to be downloaded from a server on a network as broadcast content for storage broadcasting (see, for example, Patent Document 1).

[0017] Also, a receiving device has been disclosed that stores broadcast content for satellite broadcasting that has been previously broadcast, sets a virtual channel according to the broadcast time and broadcast channel, and enables a viewer to later view the stored broadcast content that he or she desires (see, for example, Patent Document 2).

[0018] In addition, in order to individualize broadcast services by allowing nationwide satellite broadcasts to be received by replacing them with content such as commercials for a specific region, a terminal device has been disclosed that controls the replacement of content (such as commercials for a specific region) corresponding to a postal code specified by the viewer (user) (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0019] [Patent Document 1] JP 2003-284034 A [Patent Document 2] JP 2006-50426 A [Patent Document 3] Patent No. 3452509 [Non-patent literature]

[0020] [Non-Patent Document 1] "Advanced Wideband Satellite Digital Broadcasting Receiver (Desired Specifications) Standard ARIB STD-B63 Version 1.10", revised October 6, 2022 [Non-Patent Document 2] "Download Method Standard for Digital Broadcasting ARIB STD-B45 Version 3.0", revised March 18, 2014 Summary of the Invention [Problem to be solved by the invention]

[0021] As mentioned above, 8K satellite broadcasting in the new 4K8K satellite broadcasting launched in 2018 is broadcast only in left-handed circular polarization (left-handed), so in order to watch 8K satellite broadcasting, it is necessary to install a new in-home distribution system that supports left-handed IF. In other words, conventional in-home distribution systems for right-handed IF are not compatible with left-handed IF and cannot receive left-handed satellite broadcasting.

[0022] One method to solve this problem would be to broadcast 8K satellite broadcasts in real time using right-hand circular polarization, as mentioned above. However, this would require occupying one satellite repeater, and as all right-hand circular polarization satellite repeaters are currently in use to transmit existing broadcast content, there are no available repeaters, making this a little impractical.

[0023] As an alternative method, as mentioned above, if 32APSK is used as the modulation method, the transmission capacity per satellite repeater can be expanded, and a right-handed satellite repeater can be secured for 8K satellite broadcasting. However, by increasing the number of values ​​from 16APSK to 32APSK, the required C / N increases and the rainfall margin decreases, making it impossible to ensure a sufficient service availability rate for receiving satellite broadcasting.

[0024] For this reason, a new technique is needed that enables the transmission and reception of 8K satellite broadcasting content via satellite broadcasting using only right-handed circularly polarized waves with 16APSK.

[0025] Here, Non-Patent Document 2 discloses a receiving device that uses TLV to download broadcast content for accumulated broadcasting using a broadcast transmission path via a satellite repeater. The configuration disclosed in Non-Patent Document 2 is a technology that determines the date and time of downloading based on a user request by a viewer (user) or predetermined distribution schedule information, and performs sequential download processing. Therefore, with the receiving device disclosed in Non-Patent Document 2, the viewer (user) cannot receive and view the broadcast content for accumulated broadcasting simultaneously with the broadcast content for real-time broadcasting, and can only view it when the download date and time have been determined in advance.

[0026] Patent Document 1 also discloses a receiving device that enables data corresponding to broadcast content previously broadcast by terrestrial or satellite waves to be downloaded from a server on a network as broadcast content for stored broadcast. The configuration disclosed in Patent Document 1 requires a connection between the receiving device used by the viewer (user) and the server via a communication line (such as the Internet). Therefore, with the receiving device disclosed in Patent Document 1, the viewer (user) cannot view broadcast content for stored broadcast using only satellite broadcasting.

[0027] Patent Document 2 also discloses a receiving device that accumulates broadcast content for satellite broadcasting that was previously broadcast, sets a virtual channel according to the broadcast time and broadcast channel, and enables a viewer to view the accumulated broadcast content that the viewer desires later. The configuration disclosed in Patent Document 2 accumulates broadcast content for satellite broadcasting that was previously broadcast, and enables the viewer to view the broadcast content. Therefore, with the receiving device disclosed in Patent Document 2, a viewer (user) can only view broadcast content that was broadcast in real time in the past, and cannot view broadcast content that has not been broadcast in real time.

[0028] Incidentally, Patent Document 3 discloses a terminal device that controls replacement of content (such as commercials for a specific region) with content corresponding to a postal code designated by a viewer (user) in order to individualize broadcast services by replacing the content with commercials and other content for a specific region. The configuration disclosed in Patent Document 3 is a technology that plays programs (such as commercials) that are personalized for each user based on user information such as a postal code. Therefore, the receiving device disclosed in Patent Document 3 requires the viewer (user) to set user information such as a postal code, and is not suitable for conversion to accumulated broadcasting applications.

[0029] For this reason, even if stored broadcasting is used, a technique is desired that uses only right-handed circularly polarized waves to simultaneously transmit and receive real-time and stored broadcast contents via satellite broadcasting using 16APSK.

[0030] Therefore, in consideration of the above-mentioned problems, an object of the present invention is to provide a transmitting device and a receiving device thereof that can simultaneously transmit broadcast contents for real-time broadcasting and stored broadcasting via satellite broadcasting using only right-hand circularly polarized waves with 16APSK. [Means for solving the problem]

[0031] The transmitting device of the present invention is a transmitting device that simultaneously transmits broadcast contents for real-time broadcasting and broadcast contents for stored broadcasting via a broadcasting satellite using only right-handed circularly polarized waves as 12 GHz band satellite broadcasting in a satellite broadcasting system conforming to the standard ISDB-S3, and includes a program transmission facility that generates and outputs a TLV format packet as a real-time broadcast TLV in which data of the first broadcast content that has been subjected to error correction coding processing is used as a broadcast signal for real-time broadcasting in order to transmit a first broadcast content of a predetermined channel as a real-time broadcast, a file conversion unit that performs compression coding processing that can be decoded on the receiving device side on original data of a second broadcast content to be transmitted by stored broadcasting that has been input from the outside, and generates a broadcast content file for stored broadcasting, a large-capacity storage device having a function of storing at least the entire content of the second broadcast content for the broadcast content file for stored broadcasting related to the second broadcast content, and a transmission control signal for controlling the transmission of the stored broadcast from the program transmission facility, and a transmission control unit that performs compression coding processing that can be decoded on the receiving device side on original data of a second broadcast content to be transmitted by stored broadcasting, and generates a broadcast content file for stored broadcasting. a file sending server that divides a broadcast content file for accumulated broadcasting related to the transmission content into packets using a predetermined file distribution method, performs error correction coding processing, and then converts the divided broadcast content file into packets in TLV format as accumulated broadcast TLVs to be used as broadcast signals for accumulated broadcasting, and outputs the packets; a TLV multiplexing unit that inputs a real-time broadcast TLV related to the first broadcast content and an accumulated broadcast TLV related to the second broadcast content, and forms one series of composite TLV streams consisting of frames with a predetermined number of slots by time division multiplexing in which each frame is divided into two or more by the number of slots and allocated and adjusted so that the frames are transmitted by one satellite repeater in the broadcast satellite; a modulation unit that performs 16APSK modulation processing on the one series of composite TLV streams input from the TLV multiplexing unit to generate a modulated signal; and a high frequency unit that performs frequency conversion processing to a predetermined frequency band and amplification processing on the modulated signal to generate a right-handed circularly polarized uplink signal, and transmits the signal to the broadcast satellite using a predetermined transmitting antenna as a satellite broadcast signal.

[0032] In addition, in the transmitting device of the present invention, the TLV multiplexing unit forms the one series of composite TLV stream by replacing a slot that can be assigned as a specific channel area for real-time broadcasting TLV with a transmission area for the stored broadcasting TLV.

[0033] Furthermore, the receiving device of the present invention is a receiving device that receives from the transmitting device of the present invention a satellite broadcast signal including the one series of synthesized TLV streams including broadcast contents for real-time broadcasting and broadcast contents for stored broadcasting simultaneously transmitted via the broadcast satellite using only right-handed circularly polarized waves as 12 GHz band satellite broadcasting in the satellite broadcasting system, and includes a TLV stream selection unit that selects one or more synthesized TLV streams including broadcast contents specified by a user based on a TLV stream selection signal that specifies a viewing operation, selects the one series of synthesized TLV streams including both real-time broadcasting TLVs and stored broadcasting TLVs from an IF band satellite broadcast signal in which the satellite broadcast signal transmitted via the broadcast satellite has been subjected to frequency conversion to an intermediate frequency band, performs error correction decoding processing on the real-time broadcasting TLVs and the stored broadcasting TLVs in the one series of synthesized TLV streams, separates them, and outputs them; and stores the stored broadcasting TLVs sequentially output from the TLV stream selection unit, and stores the stored broadcasting TLVs related to a second broadcasting content while performing reverse processing of packet division by the predetermined file distribution method. a storage for storing one or both of a stored broadcast TLV and a real-time broadcast recording TLV sequentially output from the TLV stream selection unit, and a real-time broadcast TLV, which is reconstructed by reading out the broadcast content file for stored broadcast from the storage server as broadcast content data in MMT format; an MMT separation unit for selecting data received from one of the real-time broadcast TLV, real-time broadcast recording TLV, and stored broadcast TLV in response to a broadcast selection signal that selects and specifies broadcast content specified by a user as a viewing request, and separating and outputting compressed encoded signals of video and audio; and a MMT separation unit for receiving a playback signal indicating that the real-time broadcast recording TLV stored in the storage is to be viewed by playback selected by the user as a viewing request for the broadcast content specified by the user in synchronization with the output of the broadcast selection signal, and reading out data of the real-time broadcast recording TLV stored in the storage and outputting it to the MMT separation unit, and receiving a playback signal indicating that the real-time broadcast recording TLV stored in the storage is to be viewed by playback selected by the user as a viewing request for the broadcast content specified by the user in synchronization with the output of the broadcast selection signal,The apparatus is characterized by comprising: a read control unit that, when receiving a playback signal indicating that the accumulated broadcast TLV read from the accumulation server and stored in the storage is to be played by a user's selection or by time control based on predetermined program sequence information, reads out a broadcast content file for accumulated broadcast from the accumulation server as broadcast content data in MMT format, reconstructs the accumulated broadcast TLV and stores it in the storage, and controls to read out the accumulated broadcast TLV in which the broadcast content data in MMT format is stored and output to an MMT separation unit so that the accumulated broadcast TLV stored in the storage is played by a user's selection or by time control based on predetermined program sequence information; a video decoder that decodes the compressed and encoded video signal output from the MMT separation unit so as to be playable and outputs it to a predetermined playback device; an audio decoder that decodes the compressed and encoded audio signal output from the MMT separation unit so as to be playable and outputs it to a predetermined playback device; and an operation unit that sends out the TLV stream selection signal, the broadcast selection signal, and the playback signal as signals corresponding to a viewing request for the broadcast content designated by the user based on a user operation.

[0034] In addition, in the receiving device of the present invention, the TLV stream selection unit includes N (N is an integer of 1 or more) sets of tuner units, demodulation units, and TLV separation units, and can receive a number of composite TLV streams according to N. At least one of the N (N is an integer of 1 or more) sets of tuner units performs corresponding frequency selection based on the TLV stream selection signal, and has a function of extracting a 16APSK modulated signal of the one series of composite TLV streams. The demodulation unit to which the output of the tuner unit is input performs 16APSK demodulation processing on the modulated signal of the one series of composite TLV streams to extract the real-time broadcast TLV and the stored broadcast TLV. The demodulator has a function of extracting the transmission TLV from the real-time broadcast TLV and generating a real-time broadcast TLV and a stored broadcast TLV by performing error correction decoding processing on the data stored in the payload portion of each TLV packet, and a TLV separation unit which inputs the output of the demodulator has a function of distinguishing and separating the real-time broadcast TLV and the stored broadcast TLV, sending the stored broadcast TLV to the storage server, sending the real-time broadcast TLV to the MMT separation unit, and when the real-time broadcast TLV is to be recorded without being viewed in real time, outputting it to the storage as a real-time broadcast recording TLV, distinguishing it from the stored broadcast TLV.

[0035] In addition, in the receiving device of the present invention, the TLV stream selection unit selects, based on the TLV stream selection signal, from the IF band satellite broadcasting signal, together with the one series of synthesized TLV streams, another series of synthesized TLV streams, and receives broadcast content for real-time broadcasting of a channel related to the another series of synthesized TLV streams, making it possible to view the same in real time, while simultaneously receiving the one series of synthesized TLV streams. The receiving device is characterized in that it is equipped with N (N>1) sets of tuner units, demodulation units, and TLV separation units that can receive N series of synthesized TLV streams, where N>1. Effect of the Invention

[0036] According to the present invention, flexible allocation of satellite repeaters to 8K satellite broadcasting becomes possible, and the number of satellite broadcasting programs can be increased. In addition, 8K satellite broadcasting with right-handed circular polarization becomes possible, and 8K satellite broadcasting can be received and viewed even with receiving equipment that is compatible only with conventional right-handed IF. Furthermore, according to the present invention, the same video decoder and audio decoder as those used for existing 8K satellite broadcast reception can be used. Therefore, the receiving device according to the present invention can be realized at low cost. [Brief description of the drawings]

[0037] [Figure 1] 1 is a block diagram showing a schematic configuration of a satellite broadcasting system according to an embodiment of the present invention; [Diagram 2] 1 is a block diagram showing a schematic configuration of a transmitting device in a satellite broadcasting system according to an embodiment of the present invention. [Diagram 3] 1A and 1B are diagrams illustrating an example of a composite TLV slot configuration and a frame format of a composite TLV stream in a satellite broadcasting system according to an embodiment of the present invention. [Figure 4] 1 is a block diagram showing a schematic configuration of a receiving device in a satellite broadcasting system according to an embodiment of the present invention. [Diagram 5] 13(a) and 13(b) are diagrams illustrating an example of reception (when N=1) based on slot allocation assumed in the prior art. [Figure 6] 1(a) and 1(b) are diagrams illustrating a first example of reception (when N=1) based on slot allocation in a satellite broadcasting system according to an embodiment of the present invention. [Figure 7] 13(a) and 13(b) are diagrams illustrating a second reception example (when N>1) based on slot allocation in a satellite broadcasting system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] [Satellite Broadcasting System] Fig. 1 is a block diagram showing a schematic configuration of a satellite broadcasting system 1 according to an embodiment of the present invention. The satellite broadcasting system 1 shown in Fig. 1 is compliant with the new 4K8K satellite broadcasting standard ISDB-S3 (ARIB standard STD-B44), but is configured to transmit broadcasting contents related to 4K8K satellite broadcasting via a satellite broadcasting transmission path using only right-handed circularly polarized waves as 12GHz band satellite broadcasting. More specifically, the satellite broadcasting system 1 includes a transmitting device 2 that transmits an uplink signal related to 4K8K satellite broadcasting to a broadcasting satellite 3 using a transmitting antenna 2a, the broadcasting satellite 3 that converts the uplink signal into a downlink signal and relays it, and a receiving device 4 that receives the downlink signal related to 4K8K satellite broadcasting from the broadcasting satellite 3 using a receiving antenna 4a.

[0039] The transmitting device 2 according to an embodiment of the present invention forms one series of composite TLV streams consisting of frames of a predetermined number of slots (120 slots) by time division multiplexing in which one frame is divided into two or more by the number of slots for real-time broadcasting and stored broadcasting and the slots are allocated and adjusted.The transmitting device 2 then performs modulation processing on the one series of composite TLV streams using the 16APSK modulation method, generates a 17GHz band right-handed circularly polarized uplink signal as a satellite broadcasting signal, and transmits it to the broadcasting satellite 3 using the transmitting antenna 2a.

[0040] The broadcasting satellite 3 is used for 12 GHz band satellite broadcasting conforming to the new 4K8K satellite broadcasting standard ISDB-S3 (ARIB standard STD-B44), and is equipped with a predetermined number of satellite repeaters (not shown) that operate according to the number of multiple series of composite TLV streams. The broadcasting satellite 3 receives a 17 GHz band right-handed circularly polarized uplink signal generated by the transmitting device 2, converts it to a 12 GHz band right-handed circularly polarized downlink signal, and transmits it as a satellite broadcasting signal toward the receiving device 4, thereby relaying and transmitting. Note that one series of composite TLV streams is assigned to one satellite repeater.

[0041] The receiving device 4 according to an embodiment of the present invention receives a 12 GHz band right-handed circularly polarized downlink signal emitted from the broadcasting satellite 3 as a satellite broadcasting signal using the receiving antenna 4a, demodulates it, and acquires the one series of composite TLV streams. Then, the receiving device 4 enables the broadcasting content of 4K satellite broadcasting to be viewed in real time broadcasting and the broadcasting content of 8K satellite broadcasting to be viewed in accumulated broadcasting based on the acquired one series of composite TLV streams.

[0042] The configurations of the transmitting device 2 and the receiving device 4 in the satellite broadcasting system 1 according to an embodiment of the present invention will be described more specifically below.

[0043] [Transmitting device] Fig. 2 is a block diagram showing a schematic configuration of a transmitting device 2 in a satellite broadcasting system 1 according to an embodiment of the present invention. The transmitting device 2 shown in Fig. 2 is configured to enable simultaneous transmission of 4K satellite broadcasting content in real time broadcasting and 8K satellite broadcasting content in stored broadcasting as right-handed circularly polarized 12 GHz band satellite broadcasting, and includes a program transmission facility 20, a file conversion unit 21, a large-capacity storage 22, a file transmission server 23, a TLV multiplexing unit 24, a modulation unit 25, and a high-frequency unit 26.

[0044] In order to transmit the first broadcast content (4K satellite broadcast) of a predetermined channel in real time broadcast, the program transmission facility 20 generates a TLV (Type Length Value) format packet (hereinafter also referred to as a "TLV packet", and in particular, the TLV packet for real time broadcast is also referred to as a "real time broadcast TLV") in which the data of the first broadcast content that has been subjected to error correction coding processing is used as a broadcast signal for real time broadcast, and outputs it to the TLV multiplexing unit 24. The transmitting device 2 including the program transmission facility 20 is managed and operated by the broadcast station for the broadcast program of satellite broadcast.

[0045] Here, the broadcast signal of "New 4K8K Satellite Broadcasting" specified in ARIB standard STD-B44 (ISDB-S3) is TLV, and the TLV format packet used as the broadcast signal of the real-time broadcast according to the present invention is the same format as that specified in ARIB standard STD-B44 (ISDB-S3). In addition, ARIB standard STD-B44 (ISDB-S3) specifies compliance with "Program Array Information Used in Digital Broadcasting" specified in ARIB standard STD-B10 and "Media Transport Method by MMT in Digital Broadcasting" specified in ARIB standard STD-B60, and broadcast content data in MMT format can be used as a broadcast signal for accumulated broadcasting by transmitting it in TLV format packets. Note that the MMT format data stored in the TLV format packet can be transmitted in IP (Internet Protocol) packets after being stored in MMTP (MMT Protocol) packets. In addition, the ARIB standard STD-B60 specifies that the transmitting device 2 can periodically multiplex and transmit TLV packets that describe various messages (such as PA (Package Access) messages as control information and M2 section messages for transmitting program sequence information) specified as MMT-SI (MMT-Signaling Information) in a specified MMTP packet into the composite TLV stream to be transmitted, and the receiving device 4 can obtain program sequence information related to the composite TLV stream via the satellite broadcast transmission path.

[0046] The file conversion unit 21 functions as an encoder, and performs compression encoding processing decodable on the receiving device 4 side on original data (original signals before video and audio compression encoding) of the second broadcast content (8K satellite broadcast) for accumulation broadcasting to be transmitted by accumulation broadcasting externally inputted from the accumulation broadcasting provider, generates a broadcast content file for accumulation broadcasting, and stores it in the large-capacity storage 22. Here, the file format and directory structure of the broadcast content file for accumulation broadcasting are predetermined between the transmitting device 2 and the receiving device 4, that is, they are matched to a format and structure that can be played back by the receiving device 4.

[0047] The large-capacity storage 22 has a function of storing at least the entire contents of the second broadcast content (8K satellite broadcast) as broadcast content files for accumulated broadcasting related to the second broadcast content (8K satellite broadcast), and can be realized, for example, by multiple hard disks.

[0048] The file sending server 23 performs packet division using a predetermined file delivery method for the broadcast content file for accumulated broadcasting related to the second broadcast content (8K satellite broadcasting) stored in the mass storage 22 in accordance with a sending control signal for controlling the transmission of the accumulated broadcasting from the program sending facility 20, performs error correction coding processing, converts the file into a TLV format packet (hereinafter also referred to as "accumulated broadcast TLV") for use as a broadcast signal for accumulated broadcasting, and outputs the packet to the TLV multiplexing unit 24. For example, the predetermined file delivery method used for packet division of the file can be FLUTE (File Delivery over Unidirectional Transport), which is a unidirectional file delivery method. The sending timing of the accumulated broadcast TLV related to the broadcast content file for accumulated broadcasting follows a sending control signal generated by the program sending facility 20 in accordance with a broadcast schedule determined by a broadcasting station that manages and operates the broadcast program of the satellite broadcasting.

[0049] The TLV multiplexing unit 24 inputs a real-time broadcast TLV for the first broadcast content (4K satellite broadcast) and an accumulated broadcast TLV for the second broadcast content (8K satellite broadcast), and forms a single series of composite TLV streams consisting of frames of a predetermined number of slots (120 slots) by time division multiplexing, in which each frame is divided into two or more by the number of slots and allocated and adjusted so that they can be transmitted by one satellite repeater on the broadcast satellite 3, and outputs the resulting stream to the modulation unit 25.

[0050] 3(a) and (b) are diagrams illustrating the configuration of a composite TLV slot and the frame format of a composite TLV stream in the satellite broadcasting system 1 according to an embodiment of the present invention. First, as shown in FIG. 3(a), the TLV packet relating to the real-time broadcasting TLV and the stored broadcasting TLV is composed of a 4-byte TLV header and a TLV packet payload that stores data. The TLV header is composed of a packet type field (one byte indicating type identification and one byte indicating type) and two bytes indicating the packet length field.

[0051] As shown in FIG. 3(a), the composite TLV slot has a slot header, a main signal, TMCC basic information, TMCC transmission information, or NULL area, and a plurality of TLV packets are stored in the main signal area, and "0x71" is added to the type identification in the packet type field of the TLV packets constituting the composite TLV slot. Note that 0x means hexadecimal. In the configuration according to the present invention, the real-time broadcasting TLV and the stored broadcasting TLV are each divided into two or more slots for one frame, and are allocated and adjusted for time division multiplexing, so that the real-time broadcasting TLV and the stored broadcasting TLV are not mixed in each slot. The payload portion of each TLV packet of the real-time broadcasting TLV and the stored broadcasting TLV stores data that has been error-corrected for real-time broadcasting and stored broadcasting, respectively. The error-correcting coding process for real-time broadcasting and stored broadcasting is the same format as that specified in the ARIB standard STD-B44.

[0052] As shown in Fig. 3(b), the composite TLV stream has 120 slots per frame, and control signals required for demodulation and decoding at the receiving device 4 (i.e., TMCC signals describing TMCC basic information and TMCC transmission information) are also added. Here, as shown in slot #120 in Fig. 3(b), dummy slots are assigned at a rate of one in five slots (slots #5, #10, ... #120).

[0053] A single series of composite TLV streams can be specified using the TLV stream ID included in the TMCC transmission information in the TMCC signal. The TMCC basic information is completed with 35 bytes of information per slot and is transmitted two frames in advance, so information such as a synchronization signal that allows only this TMCC basic information to be extracted, a flag for identifying the first slot of 120 slots, and a slot counter for 120 slots is added. The TMCC transmission information is arranged from the first slot to the eighth slot, is completed with a maximum of 165 bytes of information per slot, is transmitted two frames in advance, and describes information required for demodulation (in this example, 16APSK demodulation) and decoding (in this example, error correction decoding, composite TLV stream ID, etc.).

[0054] Then, a TLV packet describing control information (TLV-SI) of the TLV multiplexing method is periodically inserted into the composite TLV stream, and the TLV-SI describes a TLV-NIT (Network Information Table) describing control information related to the satellite broadcasting transmission path, such as a frequency that specifies the physical channel of each broadcasting service and a service list descriptor. The service list descriptor of the TLV-NIT is specified in the ARIB standard STD-B32, and the receiving device 4 can determine whether the composite TLV stream is a real-time broadcasting only composite TLV stream or a composite TLV stream including stored broadcasting by referring to the service list descriptor. For example, if the service list descriptor is 0x01, it can be identified as "television broadcasting" (i.e., real-time broadcasting), and if it is 0xC1, it can be identified as including "stored broadcasting using TLV" (i.e., stored broadcasting). Here, as to which slot of one frame in the composite TLV stream contains the stored broadcast TLV, if the stored broadcasting content is replaced with the broadcasting content of a specific channel of real-time broadcasting and the stored broadcasting content is assigned, it can be identified by a normal channel selection operation by referring to the 0xC1. However, in the case where the transmitting device 2 is able to variably specify which slot in a frame to assign the stored broadcast TLV to for stored broadcasting, it is preferable to newly assign one of the currently undefined descriptors 0xC3 to 0xFF in the service list descriptor so that it is also possible to identify which slot in a frame in the composite TLV stream contains the stored broadcast TLV.

[0055] The time required for the accumulated broadcasting of the second broadcast content (8K satellite broadcasting) is calculated by multiplying the ratio of the information rate X [Mbps] of the real-time broadcasting of the first broadcast content (4K satellite broadcasting) to the transmission capacity Y [Mbps] of the accumulated broadcasting of the second broadcast content (8K satellite broadcasting) by the real-time broadcasting time (Z hours), and can be expressed as (X / Y) × Z [hours]. For example, when transmitting one hour of 8K satellite broadcasting broadcasting content (information rate 100 [Mbps]) by accumulated broadcasting with a transmission capacity of 50 [Mbps], the time required for broadcasting is two hours.

[0056] Therefore, accumulated broadcasting, which is transmitted over a longer time than real time (real-time broadcasting time), can broadcast contents with an information rate that exceeds the transmission capacity of satellite broadcasting. Therefore, in the transmitting device 2 in this embodiment, as described above, the file transmission server 23 generates and outputs the accumulated broadcasting TLV in accordance with the transmission control signal for controlling the transmission of the accumulated broadcasting from the program transmission facility 20. Also, the TLV multiplexing unit 24 forms one series of composite TLV streams consisting of frames of a predetermined number of slots (120 slots) by time division multiplexing in which the real-time broadcasting TLV and the accumulated broadcasting TLV are divided into two or more by the number of slots for each frame and allocated and adjusted so that they can be transmitted by one satellite repeater in the broadcasting satellite 3, and outputs the composite TLV stream to the modulation unit 25.

[0057] The modulation unit 25 performs 16APSK modulation processing on the one series of combined TLV stream input from the TLV multiplexing unit 24 to generate a modulated signal, and outputs it to the high frequency unit 26.

[0058] The high frequency unit 26 performs frequency conversion processing to a predetermined frequency band (17 GHz band) and amplification processing on the modulated signal for the one series of composite TLV stream input from the modulation unit 25 to generate a 17 GHz band right-handed circularly polarized uplink signal, and transmits it as a satellite broadcast signal to the broadcast satellite 3 using the transmitting antenna 2a.

[0059] In addition, in order to enable the broadcast satellite 3 to simultaneously relay and transmit at least 12 channels of real-time broadcast content related to right-handed circular polarization, in reality, there is no satellite repeater that is always available. In addition, in the current operation of the broadcast satellite 3, one synthetic TLV stream to which up to three channels are assigned as real-time broadcast content can be assigned to one satellite repeater, but one satellite repeater may operate with one channel of real-time broadcast content per synthetic stream. Therefore, the transmitting device 2 according to the present invention forms one synthetic TLV stream including the above-mentioned real-time broadcast TLV (4K satellite broadcast) and accumulated broadcast TLV (8K satellite broadcast) using only right-handed circular polarization, in addition to the one synthetic TLV stream consisting of only the conventional real-time broadcast TLV. Furthermore, the transmitting device 2 can generate satellite broadcast signals to be simultaneously transmitted by assigning multiple uplink signals corresponding to these multiple synthetic TLV streams to separate satellite repeaters in the broadcast satellite 3, and transmit the signals to the broadcast satellite 3 using the transmitting antenna 2a. Furthermore, the transmitting device 2 does not need to be limited to forming only one synthetic TLV stream including the real-time broadcast TLV and the stored broadcast TLV of the present invention, but can also be formed to transmit multiple streams simultaneously.

[0060] [Receiving device] Fig. 4 is a block diagram showing a schematic configuration of a receiving device 4 in a satellite broadcasting system 1 according to an embodiment of the present invention. The receiving device 4 shown in Fig. 4 is configured to enable simultaneous reception of 4K satellite broadcasting content in real time broadcasting and 8K satellite broadcasting content in accumulated broadcasting as right-handed circularly polarized 12 GHz band satellite broadcasting, and includes a converter 40, a TLV stream selection unit 41, an accumulation server 43, a storage 44, an MMT separation unit 45, a read control unit 46, a video decoder 47, an audio decoder 48, and an operation unit 49.

[0061] The converter 40 receives a downlink signal (i.e., a satellite broadcast signal) emitted from the broadcast satellite 3 using the receiving antenna 4a, performs frequency conversion to an intermediate frequency (IF) band to generate an IF band satellite broadcast signal, and outputs it to the TLV stream selection unit 41. When the converter 40 is built into the receiving antenna 4a, the receiving device 4 itself does not need to include the converter 40.

[0062] The TLV stream selection unit 41 is a functional unit that selects one or more composite TLV streams including broadcast contents designated by the user via the operation unit 49, and selectively outputs a composite TLV stream corresponding to the TLV stream selection signal from the IF band satellite broadcast signal input from the converter 40 based on a TLV stream selection signal that designates a viewing operation. In particular, the TLV stream selection unit 41 according to the present invention selects one series of composite TLV streams including both real-time broadcast TLVs and stored broadcast TLVs from the IF band satellite broadcast signal input from the converter 40 based on the TLV stream selection signal, performs error correction decoding processing on the real-time broadcast TLVs and the stored broadcast TLVs in the one series of composite TLV streams, and outputs the stored broadcast TLVs to the storage server 43, the real-time broadcast TLVs to the MMT separation unit 45, and further outputs the real-time broadcast TLVs to the storage 44 as real-time broadcast recording TLVs, distinguished from the stored broadcast TLVs, when recording the real-time broadcast TLVs without viewing them in real time.

[0063] More specifically, the TLV stream selection unit 41 includes N (N is an integer equal to or greater than 1) sets of tuner units 42a, demodulator units 42b, and TLV separator units 42c, and can receive a number of composite TLV streams according to N. For example, when N=1, it means that one series of composite TLV streams can be received, and when N>1, it means that multiple series of composite TLV streams according to N can be received. That is, when N=1, it is possible to selectively receive one series of composite TLV streams including both the real-time broadcast TLV according to the present invention and the stored broadcast TLV, or one series of composite TLV streams consisting of only other existing real-time broadcast TLVs. When N>1, it is possible to selectively simultaneously receive one series or multiple series of composite TLV streams according to the present invention, other existing one series or multiple series of composite TLV streams, or multiple series of composite TLV streams that are a combination of these, according to N.

[0064] Therefore, if N≧1, it is possible to selectively receive one series of composite TLV streams including at least both the real-time broadcast TLV and the stored broadcast TLV according to the present invention, and if N>1, it is possible to simultaneously receive another series of composite TLV streams while receiving one series of composite TLV streams according to the present invention. Since the number of channels of the 12 GHz right-handed BS is 12, the maximum value of N can be 12. In the following, an example of selectively receiving one series of composite TLV streams according to the present invention will be mainly described.

[0065] That is, at least one tuner unit 42a among the N (N is an integer of 1 or more) sets performs a corresponding frequency selection (channel selection) based on a TLV stream selection signal that selects a composite TLV stream including both a real-time broadcast TLV related to the first broadcast content (4K satellite broadcast) and an accumulated broadcast TLV related to the second broadcast content (8K satellite broadcast) specified by the user via the operation unit 49 from the IF band satellite broadcast signal input from the converter 40, extracts a modulated signal (16APSK) of the composite TLV stream, and outputs it to the corresponding demodulation unit 42b. The converter 40 and the tuner unit 42a are generally connected by a coaxial cable via a distributor as appropriate, but the ARIB standard STD-B63 also specifies input by an optical signal, and a distributor connected by an optical fiber cable may be used.

[0066] The demodulation unit 42b, which receives the output of the tuner unit 42a, performs 16APSK demodulation processing on the modulated signal of the composite TLV stream to extract the real-time broadcast TLV and the stored broadcast TLV, generates the real-time broadcast TLV and the stored broadcast TLV by performing error correction decoding processing on the data stored in the payload part of each TLV packet, and outputs them to the corresponding TLV separation unit 42c. Information required for error correction decoding processing is obtained from the TMCC signal of the composite TLV stream that was received two frames ahead of the others, similar to the existing method specified in the ARIB standard STD-B44.

[0067] The TLV separation unit 42c, which receives the output of the demodulation unit 42b, distinguishes between real-time broadcast TLV and stored broadcast TLV, and separates them, sending the stored broadcast TLV to the storage server 43 and the real-time broadcast TLV to the MMT separation unit 45. When the real-time broadcast TLV is to be recorded without being viewed in real time, it outputs it as a real-time broadcast recording TLV to the storage 44, distinguishing it from the stored broadcast TLV. Note that whether the real-time broadcast TLV is to be viewed in real time or output to the storage 44 as a real-time broadcast recording TLV is identified by a TLV stream selection signal.

[0068] As described above, the TLV stream selection unit 41 can separate the real-time broadcast TLV and the stored broadcast TLV by using the service list descriptor of the TLV-NIT.

[0069] The accumulation server 43 accumulates the accumulated broadcast TLVs sequentially output from the TLV stream selection unit 41, and while performing the reverse process of packet division using the above-mentioned specified file distribution method, restores and stores the broadcast content file for accumulated broadcasting relating to the second broadcast content (8K satellite broadcasting).

[0070] The storage 44 is composed of a hard disk or SSD connected to the TLV separation unit 42c in the TLV stream selection unit 41 and the storage server 43 by a USB (Universal Serial Bus) cable or the like, and stores either or both of the stored broadcast TLV reconstructed by reading the broadcast content file for stored broadcast from the storage server 43 as broadcast content data in MMT format and the real-time broadcast recording TLV sequentially output from the TLV stream selection unit 41. The reading of the broadcast content file for stored broadcast in the storage 44 from the storage server 43 is operated by a playback signal described later.

[0071] The MMT separation unit 45 selects data received from the real-time broadcast TLV, real-time broadcast recording TLV, or stored broadcast TLV in response to a broadcast selection signal that selects and specifies the broadcast content specified by the user via the operation unit 49 as a viewing request, separates it into video and audio compressed encoded signals, and outputs them to the video decoder 47 and the audio decoder 48, respectively.

[0072] More specifically, in response to a broadcast selection signal from the operation unit 49, the MMT separation unit 45 determines whether the real-time broadcast TLV input from the TLV stream selection unit 41 is to be viewed in real time, the real-time broadcast recording TLV stored in the storage 44 is to be viewed by playback selected by the user, or the stored broadcast TLV read from the storage server 43 and stored in the storage 44 is to be viewed by playback selected by the user or by playback controlled by time based on specified program arrangement information, and separates the data of the TLV packet corresponding to the determination result into compressed video and audio signals and outputs them to the video decoder 47 and the audio decoder 48, respectively.

[0073] The read control unit 46, in synchronization with the output of a broadcast selection signal from the operation unit 49, when it receives (from the operation unit 49) a playback signal indicating that the real-time broadcast recording TLV stored in storage 44 is to be viewed by playback selected by the user as a request to view broadcast content specified by the user, controls the read control unit 46 to read out the data of the real-time broadcast recording TLV stored in storage 44 and output it to the MMT separation unit 45.

[0074] In addition, when the read control unit 46 receives (from the operation unit 49) a playback signal indicating that the stored broadcast TLV read from the accumulation server 43 and stored in the storage 44 is to be played back by the user's selection or by time control based on predetermined program arrangement information as a viewing request for the broadcast content specified by the user, in synchronization with the output of the broadcast selection signal from the operation unit 49, the read control unit 46 controls to read out the broadcast content file for stored broadcast from the accumulation server 43 as broadcast content data in MMT format, reconstruct the stored broadcast TLV, and store it in the storage 44, and to read out the stored broadcast TLV in which the broadcast content data in MMT format is stored, and output it to the MMT separation unit 45 so that the stored broadcast TLV stored in the storage 44 is played back by the user's selection or by time control based on predetermined program arrangement information.

[0075] The video decoder 47 decodes the compressed video signal output from the MMT separation unit 45 so as to be playable, and outputs the decoded signal to a predetermined playback device (not shown).

[0076] The audio decoder 48 decodes the compressed audio signal output from the MMT separation unit 45 so as to be reproducible, and outputs the decoded signal to a predetermined playback device (not shown).

[0077] The operation unit 49 is a functional unit that transmits the TLV stream selection signal, the broadcast selection signal, and the playback signal as signals corresponding to a viewing request of a broadcast content designated by a user based on a user operation. That is, there are the following three signals corresponding to this viewing request.

[0078] (TLV stream selection signal) The TLV stream selection signal is output from the operation unit 49 to the TLV stream selection unit 41, and is a signal that selects one or more (N≧1) synthetic TLV streams including the broadcast content specified by the user in the TLV stream selection unit 41 and specifies the viewing operation.

[0079] (Broadcast selection signal) The broadcast selection signal is a signal that is output from the operation unit 49 to the MMT separation unit 45, and selects and designates the broadcast content designated by the user as a viewing request so that the data received by any one of the real-time broadcast TLV, real-time broadcast recording TLV, and accumulated broadcast TLV is separated into compressed video and audio signals and output in the MMT separation unit 45. In other words, the broadcast selection signal is a signal that switches the input of the MMT separation unit 45. When the user selects to view any one of the real-time broadcast TLV, real-time broadcast recording TLV, and accumulated broadcast TLV using a user interface that operates the operation unit 49, the corresponding broadcast selection signal is output from the operation unit 49 to the MMT separation unit 45.

[0080] (Playback signal) The playback signal is output from the operation unit 49 to the read control unit 46, and indicates that the real-time broadcast recording TLV stored in the storage 44 in the read control unit 46 is to be viewed by playback selected by the user, or that the stored broadcast TLV read from the storage server 43 and stored in the storage 44 is to be viewed by playback selected by the user or by playback controlled by time based on specified program arrangement information.

[0081] The playback of the stored broadcast TLV by the user's selection is as follows. First, the user selects a content file related to the broadcast content for stored broadcast stored in the storage server 43 using a user interface operated by the operation unit 49. The result of this selection is output from the operation unit 49 to the read control unit 46 as a playback signal indicating that the stored broadcast TLV corresponding to the content file read from the storage server 43 and stored in the storage 44 is to be viewed by playback selected by the user as a viewing request for the broadcast content specified by the user. Next, the read control unit 46 reads the stored broadcast TLV corresponding to the relevant content file from the storage 44 and transmits it to the MMT separation unit 45. Based on the broadcast selection signal output correspondingly from the operation unit 49, the MMT separation unit 45 separates the data of the stored broadcast TLV into compressed video and audio signals and outputs them in the same way as in the case of data received in real-time broadcasting.

[0082] The playback of the stored broadcast TLV by time control based on the predetermined program sequence information is as follows. First, the user uses a user interface to operate the operation unit 49 to refer to the program sequence information previously acquired from the transmission device 2 via the satellite broadcast transmission path, and selects a content file related to the broadcast content for stored broadcast stored in the storage server 43. The result of this selection is output from the operation unit 49 to the read control unit 46 as a playback signal indicating that the stored broadcast TLV corresponding to the content file read from the storage server 43 and stored in the storage 44 will be viewed by time control playback based on the predetermined program sequence information, as a viewing request for the broadcast content specified by the user. Next, the read control unit 46 reads the stored broadcast TLV corresponding to the relevant content file from the storage 44 and transmits it to the MMT separation unit 45. Based on the broadcast selection signal output correspondingly from the operation unit 49, the MMT separation unit 45 separates the data of the stored broadcast TLV into compressed and encoded video and audio signals and outputs them, in the same way as in the case of data received in real-time broadcasting.

[0083] [Problems with techniques anticipated from conventional technology and the effects and advantages of the present invention] (Techniques assumed from prior art) In order to clarify the difference between the technique assumed in the prior art and the present invention, first, Fig. 5 (a) and (b) show diagrams for explaining an example of reception by slot allocation assumed in the prior art (when N = 1). Here, the explanation is given assuming that the TLV stream selection unit 41 includes a set of a tuner unit 42a, a demodulation unit 42b, and a TLV separation unit 42c, where N = 1.

[0084] The new 4K8K satellite broadcasting multiplexes a plurality of programs in a TLV packet to form a plurality of synthetic TLV streams for transmission. For example, as shown in FIG. 5(a), 4K satellite broadcasting (real-time broadcasting) uses 40 slots for one channel per frame in one synthetic TLV stream as channel-based broadcasting content, and transmits up to three programs (three channels from #1 to #3) as real-time 4K satellite broadcasting with one satellite repeater. However, in the conventional new 4K8K satellite broadcasting, 120 slots are required for 8K satellite broadcasting (real-time broadcasting), and the only option is to use left-handed circularly polarized waves. If right-handed circularly polarized waves are used as shown in FIG. 5(b), it is necessary to occupy one satellite repeater. For this reason, the transmitting device 2 cannot allocate slots for 8K satellite broadcasting (real-time broadcasting) using right-handed circularly polarized waves as shown in FIG. 5(b). Therefore, when N=1, the receiving device 4 cannot simultaneously receive 4K satellite broadcasting (real-time broadcasting) and 8K satellite broadcasting (real-time broadcasting) using only right-handed circularly polarized waves.

[0085] (This invention (when N=1)) 6(a) and (b) are diagrams for explaining a first reception example (when N=1) by slot allocation according to the satellite broadcasting system 1 of an embodiment of the present invention. That is, the following description is given assuming that the TLV stream selection unit 41 includes a set of a tuner unit 42a, a demodulation unit 42b, and a TLV separation unit 42c, where N=1.

[0086] First, the satellite broadcasting system 1 of this embodiment also complies with the new 4K8K satellite broadcasting standard, and multiple programs are multiplexed in TLV packets to form and transmit multiple series of composite TLV streams. For example, as shown in Fig. 6(a), 4K satellite broadcasting (real-time broadcasting) uses 40 slots for one channel per frame in one series of composite TLV streams as broadcast content in channel units, and one satellite repeater can transmit up to three programs (for three channels, #1 to #3) as real-time broadcasting of 4K satellite broadcasting. Furthermore, in the satellite broadcasting system 1 of this embodiment, when N=1 (or N≧1) as shown in FIG. 4, 40 slots for one channel's worth of broadcast content (here, #1 is exemplified, but #2 or #3, or broadcast content of another channel, may be used instead) are used for 4K satellite broadcasting (real-time broadcasting), and 80 slots are used for 8K satellite broadcasting (accumulated broadcasting), and one series of composite TLV streams consisting of frames of a predetermined number of slots (120 slots) are formed by time division multiplexing in which one frame is divided into two by the number of slots and allocated and adjusted. However, in the one series of composite TLV streams according to the present invention, it is not necessary to limit the number of slots per frame to two as in the example of FIG. 6(b), and it can be divided into two or more. Therefore, the transmitting device 2 forms a single synthetic TLV stream including 4K satellite broadcasting (real-time broadcasting) and 8K satellite broadcasting (accumulated broadcasting) as shown in Figure 6 (b), so that the receiving device 4 can simultaneously receive 4K satellite broadcasting (real-time broadcasting) and 8K satellite broadcasting (accumulated broadcasting) using only right-hand circular polarization, even when N = 1.

[0087] (This invention (when N>1)) 7(a) and (b) are diagrams for explaining a second reception example (when N>1) by slot allocation according to the satellite broadcasting system 1 of an embodiment of the present invention. That is, the following description is given on the assumption that the TLV stream selection unit 41 includes a plurality of sets of tuner units 42a, demodulation units 42b, and TLV separation units 42c, where N>1.

[0088] Here, in order to receive the accumulated broadcast, it is necessary to constantly receive a composite TLV stream that transmits the broadcast content of the desired channel via a satellite repeater that is performing the accumulated broadcast. For this reason, when N=1, there is a problem that when viewing the broadcast content being broadcast on another channel, it is necessary to switch the channel selection of the tuner unit 42a in the TLV stream selection unit 41. Therefore, it is preferable that the receiving device 4 includes N (N is an integer of 2 or more) sets of tuner units 42a, demodulation units 42b, and TLV separation units 42c.

[0089] First, the satellite broadcasting system 1 of this embodiment also complies with the new 4K8K satellite broadcasting standard, and multiple programs are multiplexed in TLV packets to form and transmit multiple series of composite TLV streams. For example, as shown in Fig. 7(a), in an existing composite TLV stream of a different series, 4K satellite broadcasting (real-time broadcasting) uses 40 slots for one channel per frame in the composite TLV stream of the different series as broadcast content in units of channels, and one satellite repeater can transmit up to three programs (for three channels, #1 to #3) as real-time broadcasting of 4K satellite broadcasting. Furthermore, in the satellite broadcasting system 1 of this embodiment, when N>1 as shown in Fig. 4, as shown in Fig. 7(b), in the one-series synthesized TLV stream according to the present invention, separately from the other series synthesized TLV stream shown in Fig. 7(a), 40 slots for one channel (for example, #4) are used for 4K satellite broadcasting (real-time broadcasting), and 80 slots are used for 8K satellite broadcasting (accumulated broadcasting), and one frame is divided into two by the number of slots and allocated and adjusted by time division multiplexing, and is composed of a frame of a predetermined number of slots (120 slots). However, in the one-series synthesized TLV stream according to the present invention, it is not necessary to limit the number of slots per frame to two as in the example of Fig. 7(b), and it can be divided into two or more.

[0090] Therefore, the transmitting device 2 can form a separate synthetic TLV stream using only right-handed circularly polarized waves, in addition to the one synthetic TLV stream including the real-time broadcast TLV (4K satellite broadcast) and the accumulated broadcast TLV (8K satellite broadcast), and simultaneously transmit the multiple uplink signals corresponding to the multiple synthetic TLV streams by assigning them to separate satellite repeaters in the broadcast satellite 3. Therefore, the receiving device 4 is preferably configured to include N (N>1) sets of tuner units 42a, demodulator units 42b, and TLV separator units 42c that can receive N synthetic TLV streams, where N>1, in order to simultaneously receive the one synthetic TLV stream, while selecting the one synthetic TLV stream including the real-time broadcast TLV and the accumulated broadcast TLV from the IF band satellite broadcast signal based on the TLV stream selection signal, and receiving and viewing the broadcast content for real-time broadcast of the channel related to the other synthetic TLV stream in real time. As a result, the receiving device 4 can receive and view in real time broadcast content of a channel associated with another series of synthetic TLV streams consisting of only a certain real-time broadcast TLV, for example, as shown in FIG. 7(a), using only right-handed circularly polarized waves, while simultaneously receiving and storing for viewing broadcast content of accumulated broadcast (8K satellite broadcast) in the accumulated broadcast TLV based on reception of one series of synthetic TLV streams including the real-time broadcast TLV and the accumulated broadcast TLV shown in FIG. 7(b).

[0091] Therefore, according to the transmitting device 2 and the receiving device 4 of the satellite broadcasting system 1 of this embodiment, flexible allocation of satellite repeaters to 8K satellite broadcasting becomes possible, and the number of satellite broadcasting programs can be increased. In addition, 8K satellite broadcasting with right-handed circular polarization becomes possible, and 8K satellite broadcasting can be received and viewed even with receiving equipment that is compatible only with conventional right-handed IF. In addition, according to the transmitting device 2 and the receiving device 4 of the satellite broadcasting system 1 of this embodiment, the same video decoder and audio decoder as those for existing 8K satellite broadcast reception can be used. Therefore, the receiving device 4 according to the present invention can be realized at low cost.

[0092] Although the present invention has been described above by way of the embodiment, the present invention is not limited to the above-mentioned embodiment, and various modifications are possible within the scope of the technical concept. For example, in the examples of FIG. 6(b) and FIG. 7(b), 40 slots are used for 4K satellite broadcasting (real-time broadcasting) and 80 slots are used for 8K satellite broadcasting (accumulated broadcasting), but it is also possible to use 80 slots for two channels for 4K satellite broadcasting (real-time broadcasting) and 40 slots for 8K satellite broadcasting (accumulated broadcasting). In other words, the TLV multiplexing unit 24 can form a single series of composite TLV streams in which the real-time broadcasting TLV and the accumulated broadcasting TLV are divided into, for example, a first half and a second half by replacing a slot that can be assigned as a specific channel area for the real-time broadcasting TLV with a transmission area for the accumulated broadcasting TLV. The first half can be the accumulated broadcasting and the second half can be the real-time broadcasting. In addition, the present invention is not limited to such a two-part form, and it is also possible to use a form in which the stream is divided into a maximum of 24 slots in units of 5 slots, which is the minimum number of slots related to the transmission of broadcasting contents, and it can be configured to be distinguishable by the service list descriptor. For example, in the one-series synthetic stream according to the present invention, when three types of broadcast contents related to real-time broadcast TLV and accumulated broadcast TLV are simultaneously transmitted, it is possible to realize a configuration in which one frame is divided into 40 slots, for example, 4K satellite broadcast #1 + 4K satellite broadcast #2 + 8K accumulated broadcast. Therefore, the TLV multiplexing unit 24 can form the one-series synthetic TLV stream in a form in which the real-time broadcast TLV and the accumulated broadcast TLV are divided into two or more, and can be distinguished by the service list descriptor. This makes it possible to distinguish whether the synthetic TLV stream is only for real-time broadcast or includes accumulated broadcast, only by distinguishing the service list descriptor of the TLV-NIT, without requiring complex slot discrimination. In addition, in the above-mentioned embodiment, an example has been described in which the first broadcast content transmitted by real-time broadcast is the broadcast content of 4K satellite broadcast, and the second broadcast content transmitted by accumulated broadcast is the broadcast content of 8K satellite broadcast, but other combinations of broadcast contents such as 2K satellite broadcast and 6K satellite broadcast can also be used.

[0093] Therefore, the present invention should not be construed as limited by the above-described exemplary embodiments, but is limited only by the scope of the appended claims. [Industrial Applicability]

[0094] According to the present invention, flexible allocation of satellite repeaters for 8K satellite broadcasting becomes possible, and 8K satellite broadcasting can be received and viewed even with receiving equipment that is compatible only with conventional right-hand rotation IF. Therefore, the present invention is useful for a satellite broadcasting system that can simultaneously transmit broadcast content for real-time broadcasting and broadcast content for stored broadcasting via satellite broadcasting. [Explanation of symbols]

[0095] 1. Satellite Broadcasting System 2. Transmitting device 2a Transmitting antenna 3 Broadcasting satellite 4. Receiving device 4a Receiving antenna 20 Program transmission equipment 21 File conversion section 22 Mass Storage 23 File transfer server 24 TLV multiplex section 25 Modulation section 26 High Frequency Section 40 Converter 41 TLV stream selection section 42a Tuner section 42b Demodulation section 42c TLV separation section 43 Storage Server 44 Storage 45 MMT separation section 46 Readout control section 47 Video Decoder 48 Audio Decoder 49 Control section

Claims

1. A transmitting device that simultaneously transmits broadcast content for real-time broadcasting and broadcast content for stored broadcasting via a broadcasting satellite using only right-handed circularly polarized waves as 12 GHz band satellite broadcasting in a satellite broadcasting system conforming to the standard ISDB-S3, a program transmission facility for generating and outputting a packet in a TLV format as a real-time broadcast TLV, the real-time broadcast TLV being a broadcast signal for real-time broadcasting, the real-time broadcasting TLV being made from data of the first broadcasting content that has been subjected to error correction coding processing, in order to transmit the first broadcasting content of a predetermined channel by real-time broadcasting; a file conversion unit that performs a compression encoding process on the original data of the second broadcast content to be transmitted by the storage broadcasting input from the outside, the compression encoding process being decodable on the receiving device side, and generates a broadcast content file for the storage broadcasting; a large-capacity storage having a function of storing at least the entire contents of the second broadcast content for a broadcast content file for storage broadcast related to the second broadcast content; a file transmission server which divides a broadcast content file for accumulated broadcasting related to the second broadcast content stored in the large-capacity storage into packets by a predetermined file distribution method in accordance with a transmission control signal for controlling transmission of the accumulated broadcasting from the program transmission facility, performs error correction coding processing, and converts the packets into TLV format packets as accumulated broadcasting TLVs that are broadcast signals for the accumulated broadcasting, and outputs the packets; A TLV multiplexing unit that inputs a real-time broadcast TLV related to the first broadcast content and a stored broadcast TLV related to the second broadcast content, and forms one series of composite TLV streams consisting of frames with a predetermined number of slots by time division multiplexing in which one frame is divided into two or more by the number of slots and allocated and adjusted so that the TLVs are transmitted by one satellite repeater in the broadcast satellite; A modulation unit that performs 16APSK modulation processing on one series of composite TLV streams input from the TLV multiplexing unit to generate a modulated signal; a high frequency section which performs frequency conversion processing to a predetermined frequency band and amplification processing on the modulated signal to generate a right-handed circularly polarized uplink signal, and transmits the signal as a satellite broadcast signal to the broadcast satellite using a predetermined transmitting antenna; A transmitting device comprising:

2. The transmitting device described in claim 1, characterized in that the TLV multiplexing unit forms the one series of composite TLV stream by replacing a slot that can be assigned as a specific channel area for real-time broadcasting TLV as a transmission area for the stored broadcasting TLV.

3. A receiving device for receiving a satellite broadcast signal including the one series of composite TLV streams including broadcast content for real-time broadcasting and broadcast content for stored broadcasting, which are simultaneously transmitted via the broadcast satellite using only right-handed circularly polarized waves as 12 GHz band satellite broadcasting in the satellite broadcasting system from the transmitting device according to claim 1, a TLV stream selection unit which selects one or more composite TLV streams including broadcast content designated by a user, selects the one series of composite TLV streams including both real-time broadcast TLVs and stored broadcast TLVs from an IF band satellite broadcast signal obtained by performing frequency conversion to an intermediate frequency band for the satellite broadcast signal transmitted via the broadcast satellite, based on a TLV stream selection signal which designates a viewing operation, and performs error correction decoding processing on the real-time broadcast TLVs and the stored broadcast TLVs in the one series of composite TLV streams, and outputs the separated TLVs; A storage server that stores the storage broadcast TLVs sequentially output from the TLV stream selection unit, and restores and stores a broadcast content file for storage broadcasting related to a second broadcast content while performing a reverse process of packet division by the predetermined file distribution method; A storage that stores either or both of a stored broadcast TLV that is reconstructed by reading out a broadcast content file for stored broadcasting from the storage server as broadcast content data in MMT format and a real-time broadcast recording TLV that is sequentially output from the TLV stream selection unit; an MMT separation unit that selects data received in any one of a real-time broadcast TLV, a real-time broadcast recording TLV, and a stored broadcast TLV in response to a broadcast selection signal that selects and specifies broadcast content designated by a user as a viewing request, separates the data into compressed and encoded video and audio signals, and outputs the compressed and encoded video and audio signals; a read control unit which, when receiving a playback signal indicating that a real-time broadcast recording TLV stored in the storage is to be played back by a user's selection as a viewing request for a broadcast content designated by a user in synchronization with the output of the broadcast selection signal, reads out data of the real-time broadcast recording TLV stored in the storage and outputs it to the MMT separation unit, and when receiving a playback signal indicating that a stored broadcast TLV read out from the storage server and stored in the storage is to be played back by a user's selection or by time control based on predetermined program sequence information as a viewing request for a broadcast content designated by a user in synchronization with the output of the broadcast selection signal, reads out a broadcast content file for stored broadcast from the storage server as broadcast content data in an MMT format, reconstructs the stored broadcast TLV, and stores it in the storage, and controls to read out a stored broadcast TLV in the MMT format that stores the broadcast content data and outputs it to the MMT separation unit so that the stored broadcast TLV stored in the storage is played back by a user's selection or by time control based on predetermined program sequence information; a video decoder that decodes the compressed and encoded video signal output from the MMT separation unit so as to be playable and outputs the decoded signal to a predetermined playback device; an audio decoder that decodes the compressed and encoded audio signal output from the MMT separation unit so as to be playable and outputs the decoded signal to a predetermined playback device; An operation unit that transmits the TLV stream selection signal, the broadcast selection signal, and the playback signal as signals corresponding to a viewing request for a broadcast content designated by a user based on a user operation; A receiving device comprising:

4. The TLV stream selection unit includes N (N is an integer equal to or greater than 1) sets of tuner units, demodulation units, and TLV separation units, and is capable of receiving a number of composite TLV streams corresponding to N; At least one tuner unit among the N (N is an integer equal to or greater than 1) sets has a function of selecting a corresponding frequency based on the TLV stream selection signal and extracting a 16APSK modulated signal of the one series of composite TLV streams; A demodulation unit that inputs the output of the tuner unit has a function of performing 16APSK demodulation processing on the modulated signal of the one series of composite TLV stream to extract the real-time broadcast TLV and the stored broadcast TLV, and generating a real-time broadcast TLV and a stored broadcast TLV by performing error correction decoding processing on the data stored in the payload portion of each TLV packet, The receiving device described in claim 3, characterized in that the TLV separation unit which inputs the output of the demodulation unit has the function of distinguishing and separating real-time broadcast TLV and stored broadcast TLV, and outputting the stored broadcast TLV to the storage server, the real-time broadcast TLV to the MMT separation unit, and when the real-time broadcast TLV is to be recorded without being viewed in real time, outputting it to the storage as a real-time broadcast recording TLV, distinguished from the stored broadcast TLV.

5. The receiving device described in claim 4, characterized in that the TLV stream selection unit selects, based on the TLV stream selection signal, a separate series of synthetic TLV streams along with the one series of synthetic TLV streams from the IF band satellite broadcasting signal, and is characterized in that it is equipped with N (N>1) sets of tuner units, demodulation units and TLV separation units that can receive N series of synthetic TLV streams, where N>1, in order to simultaneously receive the one series of synthetic TLV streams while receiving and enabling viewing in real time broadcast content for a channel related to the separate series of synthetic TLV streams.

Images