JP4928645B2 - Transmitting apparatus and receiving apparatus - Google Patents

Description

  The present invention relates to a digital data transmission technique, and more particularly, to a transmission apparatus that transmits a digital data stream distributed over a plurality of channels, and a reception apparatus that synchronously synthesizes the digital data streams distributed over a plurality of channels. .

  First, a BS digital broadcast transmission method will be described. FIG. 1 is a diagram illustrating a configuration of a multiplex frame of BS digital broadcasting. In FIG. 1, in a multiplex frame of BS digital broadcasting, a super frame of one channel is constituted by eight frames # 1 to # 8. Frames # 1 to # 8 are each composed of 48 slots # 1 to # 48. Here, the “slot” is a portion of the MPEG-2 TS (transport stream) packet (188 bytes) excluding the leading synchronization byte (1 byte), and the parity (16 bytes) of the RS (Reed Solomon) code. ) In the memory where data can be stored. In addition, a frame synchronization signal, a TMCC (Transmission & Multiplexing Configuration Control) signal, a superframe synchronization signal, and the like are added to the first byte of each slot.

  Information for controlling transmission is written in the TMCC signal, and one set of control contents is written as a group of TMCC signals multiplexed in one superframe. The transmission control of the next superframe is performed at.

  FIG. 2 is a block diagram showing a configuration of a conventional transmission apparatus. The transmission apparatus 100 includes a frame generation unit 101, an energy spreading unit 102, an interleaving unit 103, a convolutional coding unit 104, a mapping unit 105, and a time division multiplexing / orthogonal modulation unit 106, and transmits a data stream. A series of processes from generation of a signal of multiple frames constituting one superframe shown in FIG. 1 to generation of a modulated wave signal is performed.

  The frame generation unit 101 generates a frame by designating the modulation scheme and inner code coding rate of each signal as the (n-2) th (two preceding) TMCC signals corresponding to the nth superframe. Then, a super frame is generated. In the example shown in FIG. 2, TC8PSK modulation (inner code coding rate r = 2/3) is designated for slots # 1 to # 46, and QPSK modulation (inner code coding rate r = 1) is assigned to slot # 47. / 2) is specified. Further, when TC8PSK modulation and QPSK modulation are compared, the number of bits that can be transmitted when the same number of modulation symbols is used is that QPSK modulation is only half of TC8PSK modulation. For this reason, it is a rule to multiplex-transmit a frame with slot # 48 as a dummy slot. As described above, the frame generation unit 101 inserts a dummy slot according to the efficiency of the combination of the modulation scheme to be used and the inner code coding rate. This eliminates the need to change the number of slots per frame regardless of the efficiency of the combination of the modulation scheme to be used and the inner code coding rate, and the clock rate of the multiplexed frame can be kept constant.

  Also, the frame generation unit 101 outputs the parity part of the data and the RS code among the slots in the generated frames # 1 to # 8 to the energy spreading unit 102, and the synchronization and TMCC multiplexed in the first byte of each slot The signal is output to the RS (68, 48) encoding unit 107.

  The energy spreading unit 102 receives data and the parity part of the RS code among the slots in the frames # 1 to # 8 generated by the frame generating unit 101, and applies energy spreading to the entire data in the superframe. (Bit randomization) is performed. This is realized by generating pseudo-random “1” and “0” patterns using M-sequences and adding MOD2 between this and the data in the slot. As a result, “1” or “0” does not continue, so that synchronization playback can be stabilized in the receiving apparatus 200 described later.

  The interleaving unit 103 receives data or the like that has been energy diffused by the energy spreading unit 102 and performs interleaving for each slot. This is to change the order of bits in a pseudo-random manner, and is realized by reading data written from the left to the right of each slot in the depth direction (the direction in which the frames are arranged). As a result, even if consecutive bit errors occur during transmission, the receiving device 200 described later performs deinterleaving processing to rearrange them in the original order, thereby converting them into random bit errors. The effect can be enhanced.

  The convolutional encoding unit 104 encodes the data interleaved by the interleaving unit 103 with a convolutional code (inner code) at a coding rate specified for each slot. The mapping unit 105 performs mapping by the specified modulation scheme on the data and the like convolutionally encoded by the convolutional encoding unit 104, and the time division multiplexing / orthogonal modulation unit 106 performs time division multiplexing and orthogonal modulation, A modulated wave signal is generated.

  On the other hand, the RS encoder 107 receives the synchronization and the TMCC signal multiplexed in the first byte among the slots in the frames # 1 to # 8 generated by the frame generator 101, and the Reed-Solomon code (RS) for the TMCC signal portion. [64, 48]), error correction code parity is added. The energy spreading unit 108 performs energy spreading on the TMCC signal to which the error code parity is added by the RS coding unit 107, and the convolutional coding unit 104 codes the coding rate r = 1/2 using the convolutional code, The mapping unit 105 performs BPSK mapping, and the time division multiplexing / orthogonal modulation unit 106 performs orthogonal modulation to generate a modulated wave signal. Then, the transmission device 100 transmits the modulated wave signal generated in this way.

  FIG. 3 is a diagram illustrating an example of a modulated wave signal transmitted by the transmission apparatus 100 illustrated in FIG. As shown in FIG. 3, the modulated wave signal includes, for each frame, first frame synchronization W1 (32 symbols), TMCC signal (or its error correction parity / 128 symbols), superframe synchronization (first frame). 192 symbols in total (W2 and W2 inversion pattern W3 / 32 symbols in other frames) are BPSK modulated and transmitted. Thereafter, a main signal multiplexed with video, audio, data broadcast, etc. is transmitted by the digital modulation method designated by the TMCC signal. When transmitting the main signal, a burst signal for reinforcing synchronization (random digital signal obtained by BPSK modulation) is periodically multiplexed. By repeating such processing for 8 frames, the information written in the TMCC signal is transmitted to the receiving apparatus 200 described later. Even if various transmission controls are performed in the transmission device 100, the reception device 200 can continuously switch the reception method and the like by monitoring the information of the TMCC signal.

  FIG. 4 is a block diagram showing a configuration of a conventional receiving apparatus. The receiving apparatus 200 includes a channel selection unit 201, an orthogonal detection unit 202, a TMCC decoding unit 203, an inner code decoding unit 204, a deinterleaving unit 205, an energy despreading unit 206, and an RS decoding unit 207, as shown in FIG. The modulated wave signal transmitted by the transmitting apparatus 100 is received, the transmission method is switched based on the information of the TMCC signal, and the original data stream is generated.

  The channel selection unit 201 inputs a broadcast wave, which is a modulated wave signal from the transmission device 100, as a BS-IF signal (first IF) via a BS antenna and a frequency conversion unit (not shown) built in the BS antenna. The channel is selected, and the signal of the channel is converted to the second IF frequency and output. In the frequency conversion unit, a 12 GHz band broadcast wave is converted into a 1 GHz band BS-IF signal.

  The quadrature detection unit 202 receives the BS-IF signal (second IF) of the channel selected by the channel selection unit 201 and converts it into a synchronous baseband signal. The TMCC decoding unit 203 receives the synchronous baseband signal converted by the quadrature detection unit 202, first detects a synchronous byte of the TMCC signal, and uses this as a reference for a phase that is a BPSK modulated wave that is periodically multiplexed. The position of the reference burst signal is also detected. The detection of the modulation scheme and error correction information transmitted by the TMCC signal is also performed here.

  The inner code decoding unit 204 receives the synchronous baseband signal from the quadrature detection unit 202 and the modulation scheme / error correction information detected by the TMCC decoding unit 203, and performs TC8PSK decoding on the TC8PSK modulation part. , QPSK or BPSK part is also decoded accordingly.

  The deinterleaving unit 205 restores the order of the bits that have been pseudo-randomly replaced in the interleaving unit 103 of the transmission apparatus 100 to the signal encoded by the inner code decoding unit 204. The energy despreading unit 206 restores the process in which the pseudorandom code is added by the MOD2 in the energy spreading unit 102 of the transmission device 100 to the signal deinterleaved by the deinterleaver 205. Are added by MOD2, and energy despreading processing is performed. The RS decoding unit 207 performs Reed-Solomon decoding on the signal subjected to energy despreading by the energy despreading unit 206.

Next, functions (1) to (4) realized using the TMCC signal will be described.
(1) Function for transmitting independent MPEG-2TS by a plurality of broadcasters using a single repeater When a plurality of broadcasters divide and use one repeater in slot units, the frame of the transmitting apparatus 100 The generation unit 101 assigns an identification number (TS_ID) to each of a plurality of MPEG-2 TSs to be transmitted, and generates a frame. As a result, up to eight independent MPEG-2 TSs can be transmitted within one repeater, and each broadcaster can transmit independent MPEG-2 TSs.
(2) A broadcaster who jointly uses a repeater transmits a combination of a plurality of modulation schemes according to the requirements of each broadcast, and the frame generation unit 101 of the function transmission apparatus 100 uses digital modulation schemes and error correction codes. A combination with a coding rate is selected from a maximum of four types from among seven types of menus, assigned in units of slots, and a frame is generated. As a result, a broadcaster who jointly uses the repeater can use a combination of a plurality of modulation schemes according to the requirements of each broadcast, and also enables hierarchical transmission and the like.
(3) The function generating apparatus 100 of the function transmitting apparatus 100 that automatically turns on the power of the receiving apparatus 200 at the time of emergency alert broadcasting sets an activation control signal and generates a frame at the time of emergency alert broadcasting. As a result, it is possible to realize a function such as automatically turning on the power of the receiving device 200 at the time of emergency alert broadcasting.
(4) Function to suppress interference with video and audio during site diversity operation The frame generation unit 101 of the transmission apparatus 100 sets an uplink control signal and generates a frame. Accordingly, since the site diversity operation for switching the uplink station to the remote sub station can be notified to the receiving apparatus 200 when the rain attenuation is large, the receiving apparatus 200 can minimize the influence on the video and audio. It becomes possible.

  Next, a TMCC signal for realizing the functions (1) to (4) will be described. FIG. 5 is a diagram showing information constituting a TMCC signal used in the BS digital broadcasting of the ISDB-S system. This TMCC information includes “change instruction”, “transmission mode / slot information”, “relative TS / slot information”, “relative TS / TS number correspondence table”, “transmission / reception control information”, and “extended information”. These pieces of information are set by the frame generation unit 101 of the transmission apparatus 100.

  The first item “change instruction” is information that is incremented by one every time the TMCC information is changed. As a result, it is possible to clearly distinguish between the case where the TMCC information is changed and the case where the TMCC information is apparently changed due to a code error. The change instruction information returns to “00000” after “11111”.

  The second item “transmission mode / slot information” is information described as a combination of the transmission mode and the number of assigned slots, and a specific configuration is shown in FIG. Here, the transmission mode is an item indicating a combination of a modulation scheme and an inner code to be used. As shown in Table 1, there are seven types of transmission modes that can be used in the BS digital scheme.

  There are a maximum of four types of transmission modes that can be transmitted simultaneously in one superframe, and the number including the dummy slots is described as the number of assigned slots in each transmission mode. When the number of transmission modes to be assigned is less than four, the remaining transmission modes are described as “1111” and the number of assigned slots as “000000”.

  The third item “relative TS / slot information” and the fourth item “relative TS / TS number correspondence table” will be described. In the BS digital system, the transmission device 100 can simultaneously transmit a plurality of MPEG-TSs. Further, the receiving apparatus 200 may separate a single TS from the plurality of TSs at the decoding stage before analyzing the MPEG-TS using the plurality of TSs described in the TMCC information and the correspondence information of the transmission slots. it can. Since the MPEG-TSID is composed of 16 bits and this bit length is long, if the MPEG-TS ID itself is used to describe the correspondence between each slot and a plurality of TSs in the TMCC information, the efficiency deteriorates. . Therefore, in the BS digital system, relative TS (3 bits) is used for correspondence with each slot, as shown in FIG. Further, as shown in FIG. 8, the correspondence with the MPEG-TS ID is indirectly performed by a relative TS / TS number correspondence table.

  The fifth item “transmission / reception control information” is information configured by an activation control signal and an uplink control signal, and a specific configuration is shown in FIG. The activation control signal is a signal for automatically starting up the receiving device 200 during emergency alert broadcasting. Normally, the activation control signal “0” is described, and “1” is described when the activation control to the receiving apparatus 200 is performed. The uplink control signal is a signal used when switching an uplink station at the time of rain attenuation or the like.

  The seventh item “extension information” is information used for extending TMCC information in the future, and its specific configuration is shown in FIG. When extending the TMCC information, if the extension flag is set to “1”, the subsequent extension field becomes valid. When the extension flag is “0”, the extension field is stuffed with “1”.

  Thus, by using the TMCC signal currently used in BS digital broadcasting, flexible transmission control can be performed, and the functions (1) to (4) described above can be realized.

  Incidentally, a technique for transmitting one data stream using a plurality of physical channels is known (see, for example, Patent Document 1). This transmission is called “bulk transmission”. By transmitting one data stream using N channels, a transmission bit rate approximately N times the transmission capacity per channel can be secured.

JP-A-6-152636

  In this way, in BS digital broadcasting currently in operation using TMCC signals, flexible transmission control can be performed, and it is assumed that a plurality of broadcasters jointly use repeaters. However, since it is not assumed that one broadcaster uses a plurality of repeaters and different transmission paths, for example, a plurality of repeaters (satellite repeaters) are used to transmit information with a larger capacity. There was a problem that could not be used.

  In “bulk transmission” in which a single data stream is transmitted using a plurality of physical channels, large-capacity information transmission can be performed. However, the “bulk transmission” has a problem that the degree of freedom is low because it is only possible to secure the number of channels and the transmission rate of the transmission path allocated semi-fixed in advance. In this case, it is desirable to be able to realize flexible band allocation that secures the necessary number of channels and transmission rate when necessary.

  Accordingly, the present invention has been made to solve the above-described problems, and the object of the present invention is to provide digital data that can realize large-capacity information transmission by combining a plurality of transmission paths as necessary. It is to provide a transmission device and a reception device.

  In order to solve the above-described problem, the present invention describes information for specifying a partial digital data stream when transmitting one digital data stream using distributed channels in a TMCC signal, and describes the TMCC signal. Based on the information, the partial digital data stream for each channel is synthesized with the original digital data stream.

  That is, the transmitting apparatus of the present invention is a transmitting apparatus that transmits one digital data stream distributed over a plurality of channels, and includes synchronization information for identifying a time reference of the digital data stream, and one digital data Means for generating a frame by writing a flag indicating the presence of a partial digital data stream in which the stream is distributed for each channel, information for transmission control written in a transmission control signal for performing transmission control, and a part Means for transmitting each of the generated frames including a digital data stream for each of the channels, and the flag includes one digital data stream for each channel, a main partial digital data stream, the main partial digital data stream Pre-connection part digital data synthesized by connecting before A stream and a pre-connected partial digital data stream to be combined with the main partial digital data stream when distributed to a post-connected partial digital data stream connected and combined after the main partial digital data stream. The means for generating the frame comprises: a pre-connection flag indicating presence; and a post-connection flag indicating presence of a post-connection partial digital data stream to be combined with the main partial digital data stream. At least one of channel information of each channel in which the partial digital data stream and the post-attachment partial digital data stream are transmitted is described in the transmission control signal together with synchronization information for identifying a time reference of the digital data stream. Frame generation And wherein the Rukoto.

  In the transmission apparatus of the present invention, the synchronization information is composed of a frame synchronization signal and a frame counter, and the channel information includes at least one of a media type, a channel number, and multiplexed position information in the channel. It is comprised so that it may be comprised.

  In the transmitting apparatus of the present invention, the multiplexing position information is configured to include at least one of a slot number, a relative stream number, and a stream_ID. Note that the relative stream number and stream_ID here mean the relative TS number and TS_ID in a narrow sense.

  The receiving apparatus of the present invention is a receiving apparatus that receives a digital data stream for each channel transmitted from the transmitting apparatus described above, and synthesizes these digital data streams to generate one original digital data stream. Means for identifying a partial digital data stream multiplexed in a frame having the transmission control signal in which the same synchronization information is described and the flag indicating the presence of the partial digital data stream is described for each channel; And means for synthesizing the partial digital data stream for each of the specified channels.

  Further, in the receiving apparatus of the present invention, a delay correction for determining a delay time difference between the received partial digital data streams for each channel specified by the means for specifying the partial digital data stream for each channel and canceling the delay time difference. Means for generating information, and means for correcting a delay time difference of the partial digital data streams for each channel based on the delay correction information, wherein the means for synthesizing the partial digital data streams corrects the delay time difference. The partial digital data stream for each channel is synthesized.

  Further, in the receiving apparatus of the present invention, the means for generating the delay correction information is a difference in timing of receiving a frame counter value included in the transmission control signal and a synchronization signal for each channel in which the partial data stream is transmitted. From the above, a delay time difference between these partial digital data streams is obtained.

  As described above, according to the present invention, since a plurality of transmission paths can be combined, it is possible to realize large-capacity information transmission.

It is a figure which shows the structure of the multiplex frame of BS digital broadcasting. It is a block diagram which shows the structure of the conventional transmitter. It is a figure which shows the example of the modulated wave signal transmitted by the transmitter of FIG. It is a block diagram which shows the structure of the conventional receiver. It is a figure which shows the structure of TMCC information. It is a figure which shows the structure of the transmission mode / slot information among TMCC information. It is a figure which shows the structure of the relative TS / slot information in TMCC information. It is a figure which shows the structure of the relative TS / TS number correspondence table in TMCC information. It is a figure which shows the structure of the transmission / reception control information in TMCC information. It is a figure which shows the structure of the extended information in TMCC information. It is a figure which shows the structure of the receiver by embodiment of this invention.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
[TMCC information]
First, TMCC information used in the embodiment of the present invention will be described. The transmission apparatus according to the embodiment of the present invention uses the TMCC information shown in Table 2 to transmit one digital stream by distributing it to a plurality of channels. Then, the receiving apparatus according to the embodiment of the present invention synchronously synthesizes the distributed digital stream with the original one digital stream based on the TMCC information.

  This TMCC information includes “change instruction”, “frame counter”, “transmission mode / slot information”, “other channel stream connection information”, “relative TS / slot information”, “relative TS / TS number correspondence table”, “transmission / reception control information”, and “ "Extended information". When this TMCC information is compared with the conventional TMCC information shown in FIG. 5, this TMCC information is different in that it includes “frame counter” and “other channel stream connection information” in addition to the conventional TMCC information.

  The “frame counter” is information for adjusting synchronization between different channels. For the channels through which partial data streams of the same data stream are transmitted, the same frame counter value is described on the TMCC and incremented for each superframe. For these channels, clock signals are managed and transmitted so that the frames are synchronized. That is, when the data stream is distributed and transmitted in a plurality of partial streams for each channel, this “frame counter” is used to detect the difference in transmission delay time of each partial stream.

  As shown in Table 2, “other channel stream connection information” includes “connection flag (with / without previous connection, with / without subsequent connection)”, “previous connection media number”, “rear connection media number”, and “previous connection physical channel”. It consists of “number”, “rear connection physical channel number”, “previous connection slot number” and “rear connection slot number”. “Connection flag (with / without previous connection, with / without subsequent connection)” indicates whether there is a front connection partial stream transmitted on another channel and whether there is a rear connection partial stream transmitted on another channel. Indicates whether or not. Specifically, the bit indicating whether there is a partial stream connected before the partial stream being received and the bit indicating whether there is a partial stream connected after the partial stream being received Composed.

  The “previous connection media number”, “previous connection physical channel number”, and “previous connection slot number” are valid information when there is a previous connection in the “connection flag”. The “connection physical channel number” and the “rear connection slot number” are information that is valid when there is a rear connection in the “connection flag”. The “front connection media number” and “rear connection media number” are information indicating media on which the front connection partial stream and the rear connection partial stream are transmitted, respectively. 1. The “pre-connection physical channel number” and “rear connection physical channel number” are information indicating the channels through which the front connection partial stream and the rear connection partial stream are transmitted. For example, when the medium is a BS, 1, 3, 5, 7, 9, 11, 15, 17, 19, 21, 23. In the case of 110 degree CS, any number from 1 to 24. The “front connection slot number” and “rear connection slot number” are the start numbers of the slots in which the front connection partial stream and the rear connection partial stream are transmitted, that is, from which slot the front connection partial stream and the rear connection partial stream are multiplexed. For example, it is any number from 1 to 48 as the front connection slot number and any number from 1 to 48 as the back connection slot number.

[Transmitter]
Next, the transmission apparatus according to the embodiment of the present invention will be described. The transmission apparatus 1 has a configuration substantially the same as the conventional transmission apparatus 100 shown in FIG. 2, and includes a frame generation unit 11, an energy spreading unit 102, an interleaving unit 103, a convolutional coding unit 104, a mapping unit 105, a time A division multiplexing / orthogonal modulation unit 106, an RS encoding unit 107, and an energy spreading unit 108 are provided (not shown). Comparing the conventional transmission apparatus 100 shown in FIG. 2 with the transmission apparatus 1, both apparatuses include an energy spreading unit 102, an interleave unit 103, a convolutional coding unit 104, a mapping unit 105, and a time division multiplexing / orthogonal modulation unit. 106, the RS encoding unit 107 and the energy spreading unit 108 are the same, but the transmission device 1 includes a frame generation unit 11 different from the frame generation unit 101 of the conventional transmission device 100. Is different. Hereinafter, the energy spreading unit 102, the interleaving unit 103, the convolutional coding unit 104, the mapping unit 105, the time division multiplexing / orthogonal modulation unit 106, the RS coding unit 107, and the energy spreading unit 108 are as shown in FIG. Since it is the same, description is abbreviate | omitted here.

  The frame generation unit 11 included in the transmission device 1 according to the embodiment of the present invention sets the 1530 + N-bit TMCC information shown in Table 2, generates a frame, and generates a superframe. The conventional frame generation unit 101 shown in FIG. 2 can set 384-bit TMCC information and generate a frame, but cannot set 1530 + N-bit TMCC information. Therefore, the frame generation unit 11 sets 1530 + N-bit TMCC information having a size exceeding 384 bits.

  Specifically, the frame generation unit 11 sets TMCC information by the following four methods. That is, in the first method, when the TMCC information is set, the frame generation unit 11 divides the TMCC information into a plurality of pieces, and attaches a page number to each of the divided TMCC information. Then, a frame including TMCC information of one of the page numbers is generated, and a super frame is generated. Similarly, a frame including TMCC information of another one page number is generated, and a super frame is generated. As a result, a plurality of decomposed TMCC information is transmitted by being included in different temporally continuous superframes, and the number of bits of TMCC information to be transmitted is expanded.

  In the second method, the number of frames constituting the superframe is expanded. That is, the frame generation unit 11 sets TMCC information in the TMCC signal area of the extended frame, generates a frame, and generates a super frame. As a result, the number of bits of TMCC information to be transmitted is expanded.

  In the third method, not only the first 1 byte of the area of the TMCC signal to be multiplexed (the portion where the TMCC signal is multiplexed on the first byte of the slot shown in FIG. 1), but several bytes are added on the left side. This is expanded so that it can be used as a TMCC area. That is, the frame generation unit 11 sets TMCC information in the extended TMCC signal area, generates a frame, and generates a superframe. As a result, the number of bits of TMCC information to be transmitted is expanded.

  In the fourth method, the number of slots per frame is expanded. That is, the frame generation unit 11 sets TMCC information in the TMCC signal area of the extended slot, generates a frame, and generates a superframe. As a result, the number of bits of TMCC information to be transmitted is expanded.

[Receiver]
Next, the receiving apparatus according to the embodiment of the present invention will be described. FIG. 11 is a diagram showing a configuration of a receiving apparatus according to the embodiment of the present invention. The receiving device 2 includes a signal distribution unit 20, a main stream reception unit 40-1, a front connection stream reception unit 40-2, a rear connection stream reception unit 40-3, and a signal switching unit 23. The main stream receiving unit 40-1 includes a channel selection unit 201-1, an orthogonal detection unit 202-1, a TMCC decoding unit 203-1, an inner code decoding unit 204-1, a deinterleave unit 205-1, and an energy despreading unit 206. -1, RS decoding unit 207-1, multiple stream connection control unit 21, and delay control unit 22-1. Here, the channel selection unit 201-1 of the main stream reception unit 40-1, the orthogonal detection unit 202-1, the TMCC decoding unit 203-1, the inner code decoding unit 204-1, the deinterleave unit 205-1, the energy despreading Unit 206-1 and RS decoding unit 207-1 have the same functions as those provided in conventional receiving apparatus 200 shown in FIG. The other configuration of the receiving device 2 shown in FIG. 11 is different from the configuration of the conventional receiving device 200 shown in FIG. That is, the receiving device 2 includes a signal distribution unit 20, a multi-stream connection control unit 21 and a delay control unit 22-1, a front connection stream reception unit 40-2, and a rear connection stream reception unit 40- in the main stream reception unit 40-1. 3 and the signal switching unit 23 are different from the conventional receiving device 200.

  Further, the pre-connection stream reception unit 40-2 includes a channel selection unit 201-2, an orthogonal detection unit 202-2, a TMCC decoding unit 203-2, an inner code decoding unit 204-2, a deinterleaving unit 205-2, and an energy inverse unit. A spreading unit 206-2, an RS decoding unit 207-2, and a delay control unit 22-2 are provided. Similarly, the post-connection stream reception unit 40-3 includes a channel selection unit 201-3, an orthogonal detection unit 202-3, a TMCC decoding unit 203-3, an inner code decoding unit 204-3, a deinterleaving unit 205-3, an energy A despreading unit 206-3, an RS decoding unit 207-3, and a delay control unit 22-3 are provided.

  For example, it is assumed that the transmission apparatus 1 distributes the data stream having the same number to three at the frame level or the slot level and transmits the data stream through these transmission lines in the order of the first channel, the second channel, and the third channel. To do. In this case, in the receiving apparatus 2, the main stream receiver 40-1 receives the partial stream of the second channel, the pre-connection stream receiver 40-2 receives the partial stream of the first channel, and the post-connection stream receiver 40-3 receives the partial stream of the third channel, each delay control unit 22-1, 2, 3 performs delay processing so that these partial streams can be synchronized, and the signal switching unit 23 performs these parts. Combine the streams to generate the original data stream.

  The signal distribution unit 20 receives a broadcast wave, which is a modulated wave signal from the transmission device 100, as a BS-IF signal through a BS antenna and a frequency conversion unit (not shown), and receives the input BS-IF signal. The three streams are distributed and output to the main stream receiver 40-1, the pre-connection stream receiver 40-2, and the post-connection stream receiver 40-3.

  Channel selection units 201-1 to 201, orthogonal detection units 202-1 to 202, and TMCC decoding unit 203 included in the main stream reception unit 40-1, the pre-connection stream reception unit 40-2, and the post-connection stream reception unit 40-3. -1 to 3, inner code decoding units 204-1 to 204, deinterleaving units 205-1 to 205, energy despreading units 206-1 to 206-3, and RS decoding units 207-1 to 70-3 are the same as those shown in FIG. Therefore, the description is omitted here.

  The multi-stream connection control unit 21 receives synchronization information and TMCC information (TMCC information shown in Table 2) from the TMCC decoding unit 203-1 of the main stream receiving unit 40-1. Based on the “connection flag” in the “connection information”, it is determined whether or not there is a front connection partial stream and a back connection partial stream. If it is determined that there is a previous connection partial stream, the “previous connection physical channel number” in the “other channel stream connection information” is output to the channel selection unit 201-2 of the previous connection stream reception unit 40-2. When the “previous connection physical channel number” is input, the channel selection unit 201-2 of the previous connection stream reception unit 40-2 selects a partial stream of the channel number. Similarly, when it is determined that there is a post-connection partial stream, the “post-connection physical channel number” in the “other channel stream connection information” is input to the channel selection unit 201-3 of the post-connection stream reception unit 40-3. Output. When the “rear connection physical channel number” is input, the channel selection unit 201-3 of the rear connection stream receiving unit 40-3 selects the partial stream of the channel number.

  Further, the multi-stream connection control unit 21 receives the synchronization information and the TMCC information from the TMCC decoding unit 203-2 of the previous connection stream reception unit 40-2, and receives the synchronization information reception time and the main stream reception unit 40-1 The value of the “frame counter” in the TMCC information is compared with the reception time of the synchronization information in the pre-connection stream receiving unit 40-2 and the value of the “frame counter” in the TMCC information. If the values of the “frame counter” are different, the difference between the frame counter values is obtained, and the difference between the frames is multiplied by the period of the frame, that is, the time difference between streams, that is, the delay correction time is calculated. By outputting to the delay control unit 22-1 of the stream reception unit 40-1 and / or the delay control unit 22-2 of the pre-connection stream reception unit 40-2, a relatively long delay time difference is canceled in units of superframes. . Further, the reception times of the respective synchronization information are compared, and the delay difference between the two receiving units is detected. The delay correction time is calculated so as to eliminate this delay difference, and the calculated delay correction time is used as the delay control unit 22-1 of the main stream reception unit 40-1 and / or the delay control of the pre-connection stream reception unit 40-2. Output to the unit 22-2.

  Similarly, the multi-stream connection control unit 21 receives the synchronization information reception time and the TMCC information from the TMCC decoding unit 203-3 of the post-connection stream reception unit 40-3, and receives the synchronization information of the main stream reception unit 40-1. The value of “frame counter” in the reception time and TMCC information is compared with the value of “frame counter” in the reception time of synchronization information and TMCC information in the post-connection stream reception unit 40-3. If the values of the “frame counter” are different, the difference between the frame counter values is obtained, and the difference between the frames is multiplied by the period of the frame, that is, the time difference between streams, that is, the delay correction time is calculated. By outputting to the delay control unit 22-1 of the stream reception unit 40-1 and / or the delay control unit 22-3 of the post-connection stream reception unit 40-3, a relatively long delay time difference is canceled in units of superframes. . Further, the reception times of the respective synchronization information are compared, and the delay difference between the two receiving units is detected. The delay correction time is calculated so as to eliminate this delay difference, and the calculated delay correction time is used as the delay control unit 22-1 of the main stream reception unit 40-1 and / or the delay control of the post-connection stream reception unit 40-3. Output to the unit 22-3.

  The multiple stream connection control unit 21 compares the reception time of the synchronization information by the three receiving units and the value of the “frame counter”, and when the value of the “frame counter” is different, based on the difference between the frame counters, A relatively large delay difference between the respective reception units may be detected, and further, a minute delay difference between the respective reception units may be detected based on the reception time of the respective synchronization information. Also in this case, the delay correction time is calculated so as to eliminate this delay difference, and the calculated delay correction time is output to each receiving unit.

  The delay control units 22-1 to 23-1 of the main stream reception unit 40-1, the front connection stream reception unit 40-2, and the rear connection stream reception unit 40-3 receive the delay correction time from the multiple stream connection control unit 21, The output timing of the partial stream input from the RS decoders 207-1 to 207-3 is adjusted by the delay correction time. That is, the delay control units 22-1 to 2-3 output the partial streams to the signal switching unit 23 at the same timing.

  The signal switching unit 23 inputs partial streams at the same timing from the delay control units 22-1 to 22-3 of the front connection stream reception unit 40-2, the main stream reception unit 40-1, and the rear connection stream reception unit 40-3. Are stored in the memory in this order. Also, TMCC information is input from the multi-stream connection control unit 21, and the “previous connection slot number”, “rear connection slot number” and “slot / relative TS number correspondence table” in “other channel stream connection information” of the TMCC information. , The slot information is read from the memory, a frame is generated, and a data stream is generated and output.

  As described above, according to the embodiment of the present invention, since the transmission apparatus 1 transmits information using different media and channels, a large amount of information transmission can be realized by combining a plurality of transmission paths. Is possible.

  Specifically, according to the embodiment of the present invention, the transmitting apparatus 1 describes “frame counter” and “other channel stream connection information” indicating the presence / absence of a connection partial stream, channel number, etc. in TMCC information. Then, the partial stream was transmitted. In addition, the receiving apparatus 2 uses the value of the “frame counter” in the TMCC information to perform synchronous synthesis on the main partial stream, the front connection partial stream, and the rear connection partial stream. Thereby, since it can be determined that the partial streams are separated from the same data stream, the original data stream can be generated in the receiving device 2.

  Also, the receiving apparatus 2 determines whether the main partial stream being received constitutes a valid data stream by itself based on the “connection flag” in “other channel stream connection information” of the TMCC information. It is possible to determine whether there is a pre-connected partial stream that must be received prior to reception of, or a post-connected partial stream that must be received after receiving the main partial stream.

  In addition, the receiving device 2 uses the “previous connection media number”, “rear connection media number”, “previous connection physical ch number”, “rear connection physical ch number”, “front connection slot” in “other channel stream connection information” in the TMCC information. "Number" and "Post-connection slot number" indicate whether the media carrying the pre-connection partial stream to be received prior to the reception of the main partial stream being received is BS or 110 degrees CS, and how many channels of the media It is possible to determine whether the data is transmitted in the channel, and in which slot of the channel the data is transmitted. In addition, after receiving the main partial stream being received, the media on which the post-connection partial stream that should be received is transmitted is BS or 110 degrees CS, and how many channels of the media are transmitted Further, it is possible to determine in which slot of the channel the data is transmitted.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea thereof. For example, the receiving device 2 is configured to include the main stream receiving unit 40-1, one system pre-connection stream reception unit 40-2, and one system post-connection stream reception unit 40-3. The number of lines is not limited. When receiving more than two pre-connection partial streams and post-connection partial streams, that is, when the number of channels to be used exceeds 3, the system is configured to include a receiving unit of a system corresponding to the number. In other words, two or more systems of pre-connection stream reception units 40-2 and two or more systems of pre-connection stream reception units 40-3 may be provided.

  Further, when two channels are used, the reception apparatus 2 combines the main stream reception unit 40-1, the pre-connection stream reception unit 40-2, and the post-connection stream reception unit 40-3 in one system. A receiving unit is provided.

  Further, in the case where the BS and the 110-degree CS are not operated across media, the “pre-connection media number” and “rear-connection media number” may be omitted. In addition, “pre-connection physical channel number” and “rear connection physical channel number” may directly specify other information that can identify a channel in the medium, for example, a transmission frequency. Furthermore, for “pre-connection slot number” and “rear connection slot number”, information for identifying the slot position where the partial data stream is multiplexed, for example, “front connection relative TS number”, “rear connection relative TS number” or “front connection “TS_ID” and “post-connection TS_ID” may be used. Also, when prescribing the operation of transmitting all the partial data streams to be distributed and transmitted with the same TS_ID, even if transmission of multiple positions in the channel of the partial data stream of the pre-connection and the post-connection is omitted, It is also possible to detect only from other items of TMCC information of each channel.

DESCRIPTION OF SYMBOLS 1,100 Transmission apparatus 2,200 Reception apparatus 20 Signal distribution part 21 Multiple stream connection control part 22 Delay control part 23 Signal switching part 40-1 Main stream reception part 40-2 Pre-connection stream reception part 40-3 Post-connection stream reception Unit 11, 101 frame generation unit 102, 108 energy spreading unit 103 interleaving unit 104 convolutional encoding unit 105 mapping unit 106 time division multiplexing / orthogonal modulation unit 107 RS encoding unit 201 channel selection unit 202 orthogonal detection unit 203 TMCC decoding unit 204 Inner code decoding unit 205 Deinterleaving unit 206 Energy despreading unit 207 RS decoding unit

Claims (6)

A transmission apparatus that distributes one digital data stream to a plurality of channels and transmits the digital data stream,
Information for controlling transmission is written and transmitted as synchronization information for identifying the time reference of the digital data stream and a flag indicating the existence of a partial digital data stream in which one digital data stream is distributed for each channel. Means for generating a frame described in a transmission control signal for performing control;
Means for transmitting the generated frame including a partial digital data stream for each of the channels,
The flag is
One digital data stream is connected for each channel, a main partial digital data stream, a pre-connected partial digital data stream connected and combined before the main partial digital data stream, and connected after the main partial digital data stream A pre-connection flag indicating the presence of a pre-connection partial digital data stream to be combined with the main partial digital data stream when distributed to the post-connection digital data stream to be combined; and
Comprising a post-connection flag indicating the presence of a post-connection partial digital data stream to be combined in connection with the main partial digital data stream;
The means for generating the frame includes:
The transmission control signal includes synchronization information for identifying a time reference of the digital data stream, at least one of channel information of each channel through which the front connection partial digital data stream and the rear connection partial digital data stream are transmitted. A transmission apparatus characterized by generating a frame described in 1. The transmission apparatus according to claim 1,
The synchronization information includes a frame synchronization signal and a frame counter, and the channel information includes at least one of a media type, a channel number, and multiple position information in the channel. Transmitting device. The transmission device according to claim 2,
The transmitting apparatus, wherein the multiple position information includes at least one of a slot number, a relative stream number, and a stream_ID. A receiving device that receives the digital data stream for each channel transmitted from the transmitting device according to any one of claims 1 to 3 and combines the digital data streams to generate one original digital data stream. Because
Means for identifying, for each channel, a partial digital data stream multiplexed in a frame having the transmission control signal in which the same synchronization information is described and the flag indicating the presence of the partial digital data stream is described;
Means for synthesizing the partial digital data stream for each identified channel;
A receiving apparatus comprising: The receiving device according to claim 4,
Means for obtaining a delay time difference between the received partial digital data streams for each channel specified by the means for specifying the partial digital data stream for each channel, and generating delay correction information for canceling the delay time difference;
Means for correcting a delay time difference of the partial digital data stream for each channel based on the delay correction information;
The receiving device characterized in that the means for synthesizing the partial digital data streams synthesizes the partial digital data streams for each channel in which the delay time difference is corrected. The receiving device according to claim 5,
The means for generating the delay correction information is based on the difference between the frame counter value included in the transmission control signal for each channel through which the partial data stream is transmitted and the timing of receiving the synchronization signal. A delay time difference is obtained.

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