JP2009253843A - Digital terrestrial broadcast receiver, and digital terrestrial broadcast receiving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, when TMCC data selected in respective branches become different, there is a risk that TMCC data to be employed cannot be determined. <P>SOLUTION: A TMCC controller 16, when a difference between respective control data from a plurality of branches 20 to 23 is made, selects specific ones of the plurality of control data which are the same and hold a majority. For this reason, even when a plurality of sorts of control data corresponding to a plurality of broadcast stations are present in a plurality of reception signals received simultaneously from the plurality of broadcast stations, the receiver 1 can reliably output transport stream data from a group of transmission data which has a majority with use of suitable specific control data corresponding to the transmission data group. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a terrestrial digital broadcast receiving apparatus that receives a received signal.

  Digital broadcasting has already started in Japan, and so-called orthogonal frequency division multiplexing (OFDM) is adopted as a transmission method in terrestrial digital broadcasting in Japan.

  This OFDM is called a multi-carrier scheme, and is a technique for performing digital broadcasting by setting up thousands of carriers in a transmission band and assigning data to each carrier. This OFDM is able to perform error correction on other carriers even if the data allocated to some carriers is damaged, so that it is difficult for ghosts and the like that have occurred in conventional analog broadcasting to occur. Has characteristics.

  In order to avoid deterioration of the reception state accompanying movement, the mobile reception device employs a technique for ensuring a stable reception state by adopting a so-called diversity reception method. This diversity reception method is a method of combining received signals based on broadcast waves received by a plurality of antennas, or selecting an antenna having a good reception state from a plurality of antennas.

  In general, a receiving apparatus has a high possibility of receiving a deteriorated signal under a bad reception environment such as a fringe area, and an error is likely to occur in many of the received signals. Further, the conventional receiving apparatus sometimes recognizes the result as a correct result due to an erroneous determination in the error correction process.

In such a receiver, in such a case, TMCC data obtained from a plurality of carriers in one symbol is subjected to majority processing for each bit in units of branches, and TMCC data to be used is determined (for example, Patent Literature). 1).
JP 2002-218339 A (0047, FIG. 5)

  However, even if the conventional receiving apparatus performs the majority process for each branch as described above, there is a possibility that each TMCC data selected in each branch may be different. There is a possibility that the TMCC data to be used in the process cannot be determined. In addition, in the conventional receiving apparatus, when the function for preventing the reception of the broadcast wave in a state where the TMCC data to be used cannot be determined as described above is installed, there is a possibility of affecting the reception process of the broadcast wave itself. there were.

  The problem to be solved by the present invention includes the above-described problem as an example.

  In order to solve the above-mentioned problem, the invention according to claim 1 demodulates received signals received independently by a plurality of antennas, and superimposes each transmitted data included in each received signal and each transmitted data. When there is a difference in the contents of the control data acquired in each branch and the plurality of branches that acquire each control data, the specific data that is the same among the plurality of control data and occupies a large number Control data selection means for selecting control data, reconfiguration means for reconstructing transport stream data by combining the plurality of transmission data using the specific control data selected by the control data selection means; Have

  In order to solve the above-mentioned problem, the invention according to claim 6 divides received signals received independently by a plurality of antennas into each transmission data and each transmission data included in each received signal. When there is a difference in the contents of each of the control data acquired by a plurality of branches that acquire each control data that is superimposed, select specific control data that is the same and occupies a large number among the plurality of control data And a reconfiguration step of reconstructing transport stream data by combining the plurality of transmission data using the specific control data selected in the control data selection step.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In the ISDB-T system, OFDM (Orthogonal Frequency Division Multiplexing) is adopted as a transmission system. In this OFDM system, data is divided and transmitted on a number of carriers that are orthogonal to each other.

  The bandwidth of each frequency (hereinafter also referred to as “channel”) for digital terrestrial television broadcasting is 6 MHz. The transmission path of each channel is formed by 13 OFDM segments, with a bandwidth (approximately 429 kHz) obtained by dividing 6 MHz into 14 equals as one OFDM segment bandwidth. In order to improve mobile reception performance, a vehicle-mounted receiving apparatus employs a diversity configuration including a plurality of antenna inputs.

  FIG. 1 is a block diagram illustrating an example of an electrical configuration of a receiving device 1 as an embodiment.

  The receiving apparatus 1 includes branches 20 to 23, a diver synthesis unit 14, a transport stream data (hereinafter referred to as “TS data”) playback unit 15, a TMCC controller 16, and a controller 17.

  Each of the branches 20 to 23 is an independent component corresponding to each of a plurality of antennas (divers) (four are exemplified in this embodiment). Each branch 20-23 demodulates, for example, the reception signals received simultaneously and independently by four antennas, and transmits transmission data included in the reception signals and TMCC data (control data) superimposed on the transmission data. Has a function to acquire.

  Each branch 20-23 includes an A / D converter 3, a symbol synchronization detection unit 4, an FFT 5, an equivalent processing unit 6, a frame synchronization detection unit 7, and a TMCC decoding unit 8. The controller 17 controls the symbol synchronization detection unit 4, the TMCC controller 16 and the TS data reproduction unit 15 of each branch 20-23.

  The A / D converter 3 quantizes the broadcast wave that has become an intermediate frequency signal (corresponding to an IF signal shown) via a tuner (not shown) in each of the branches 20 to 23, and converts the analog data into digital data. . The symbol synchronization detection unit 4 performs OFDM signal transmission mode and guard interval ratio determination after initialization of reception processing such as channel change, and establishes symbol synchronization. An FFT (Fast Fourier Transform) 5 performs FFT processing on a symbol for which symbol synchronization has been established, and extracts each carrier component constituting the OFDM signal. The equivalent processing unit 6 compensates for distortion in the transmission path for each carrier component extracted by the FFT 5. The frame synchronization detection unit 7 detects the synchronization of each OFDM frame. The TMCC decoding unit 8 demodulates the TMCC data output from the FFT 5 and acquires TMCC information and the like.

  The TMCC data is transmitted in a state of being modulated by DBPSK (Differential Quadrature Phase Shift Keying) at a carrier position defined in the ISDB-T specification. The position of the TMCC data is determined from the carrier position defined in the ISDB-T specification based on the transmission mode and guard interval information obtained when the symbol synchronization is established.

  TMCC data consists of 204 bits and is completed for each OFDM frame. This TMCC data is transmitted in a state where one bit is superimposed on each symbol.

  The TMCC data is a bit string composed of a standard for operation demodulation, an OFDM frame synchronization signal (hereinafter simply referred to as “synchronization signal”), a segment type identification, TMCC information, and parity bits. This parity bit is data for performing error correction of TMCC information. The TMCC information includes a system identification, a transmission parameter switching index, an emergency warning broadcast activation flag, current information, next information, a connected transmission phase correction amount, and the like. The current information and the next information include a partial reception flag and each layer transmission parameter information. The current information indicates the current layer configuration and transmission parameter information. Next information indicates transmission parameter information after switching.

  When receiving in the vehicle-mounted receiving device 1, since the reception status differs for each input of 20 to 23, there is no guarantee that broadcast waves can be received at all branches 20 to 23 at all times. After the OFDM frame synchronization is established, the TMCC information of the branch where it is clear that an error exists is discarded by the error correction process.

  The diver combining unit 14 combines the transmission data from the branches 20 to 23 into the diver and passes it to the TS data reproducing unit 15. The TS data reproducing unit 15 performs TS data reconstruction processing. In this TS data reconfiguration processing, after transmission data is diversified in this way, processing for reconfiguring TS data is performed.

  The TS data reconstruction process requires transmission parameter information such as a partial reception flag, modulation parameter, convolutional coding rate, time interleave length, and segment structure transmitted as TMCC information. These pieces of information cannot be determined unless data of one OFDM frame or more is acquired because the TMCC information is error-correction encoded with (184, 102). However, by holding these values as specific initial values, TS data reconstruction processing can be performed before receiving one OFDM frame.

  The TMCC controller 16 acquires TMCC data decoded by the TMCC decoding unit 8 of each branch 20 to 23 and executes majority processing. That is, as a majority process, the TMCC controller 16 selects specific TMCC data that is the same and occupies the majority among the plurality of TMCC data when there is a difference between the TMCC data from the branches 20 to 23. . In the present embodiment, when a difference occurs between the TMCC data from the branches 20 to 23, the TMCC controller 16 selects specific control data that is the same and has the largest number among the plurality of TMCC data. Shall.

  The diver combining unit 14 and the TS data reproducing unit 15 described above correspond to a reconstructing unit, and using the specific TMCC data selected by the TMCC controller 16 as described above, the plurality of transmission data are combined to generate TS data. Reconfigure.

  The TMCC controller 16 (control data control means) updates the internal TMCC data according to the transmission parameter switching index when the transmission parameter switching index (control data switching index) for notifying the switching of the TMCC data can be normally acquired. To do.

  On the other hand, the TMCC controller 16 acquires the control data switching index (transmission parameter switching index) for notifying the switching of the TMCC data from the TMCC data after that, depending on the reception status of the received signal. When the new TMCC data thus generated is different from the internal TMCC data, the following unique switching different from the update of the TMCC data according to the transmission parameter switching index is performed.

  That is, the TMCC controller 16 holds the new TMCC data for a predetermined period, and when it is found that the same new TMCC data has been continuously acquired by the branches 20 to 23 thereafter, the new TMCC data Update the internal TMCC data.

  The TMCC controller 16 is set when the new TMCC data acquired by the branches 20 to 23 is different from the internal TMCC data, and the new TMCC data subsequently acquired by the branches 20 to 23 is A discrepancy confirmation flag (Discored_Flag) that is initialized when it coincides with the TMCC data.

  The TMCC controller 16 starts measuring the number of times of TMCC data received repeatedly when the mismatch confirmation flag is set, and the new TMCC data acquired thereafter by the branches 20 to 23 changes. A counter (Discounted_Count) that counts the number of times reception is continued without being performed.

It is assumed that the antenna used in the in-vehicle receiver 1 has lower directivity than that generally used at home. The in-vehicle receiving device 1 is assumed to receive broadcast waves transmitted from different broadcasting stations adjacent to each antenna at the transmission area end (fringe area) assumed by each broadcasting station, and is different for each branch. The possibility of receiving TMCC information is assumed.

  In the present embodiment, the TMCC information received in each of the branches 20 to 23 is compared, and if there is a difference, majority processing is performed to determine the TMCC information. If the majority cannot be determined, TMCC information of a preset branch is adopted.

  Each branch 20-23 starts acquisition of TMCC data after initialization by channel change. In TMCC data, the data bit position is determined by detecting a synchronization signal arranged at the head of the OFDM frame, and the contents can be discriminated.

  Since the TMCC data is error-correction-encoded with a (184,102) differential cyclic code, it cannot be determined without obtaining all the data. However, since TMCC data is transmitted by DQPSK, which is a strong modulation method, it is estimated that there is a high possibility that error-free data can be obtained if the reception state is such that TS data can be reconstructed.

  Therefore, in this embodiment, as soon as the current information of the TMCC information acquired immediately after initialization can be acquired, this current information is transferred to the TMCC controller 16, and this TMCC controller 16 reflects the TS data reconfiguration processing after the TMCC information is determined. .

  If transmission parameter information of the broadcast wave being transmitted differs from the initial setting value by this processing, TS data reconstruction processing can be performed in accordance with the transmission parameter information before acquisition of one OFDM frame, and the reconstructed TS data Can be expected to increase the output speed.

  In the terrestrial digital broadcast receiving apparatus, transmission parameter information is transmitted to the receiving apparatus using TMCC information, and TS data reconfiguration processing is performed using the TMCC information. The TMCC information can be dynamically changed, but the switching timing is transmitted to the receiving apparatus 1 by a transmission parameter switching index in the TMCC information. The receiving apparatus 1 is expected to smoothly follow the switching of transmission parameter information by referring to the transmission parameter switching index.

  However, the vehicle-mounted receiving device 1 may not be able to receive the transmission parameter switching index due to the influence of a shield such as a tunnel. In addition, as described above, it is assumed that radio waves from different broadcasting stations can be received in the fringe area, and the transmission parameter information of adjacent broadcasting stations may be different. Therefore, in this embodiment, the receiver 1 itself proposes an algorithm corresponding to the change of TMCC information.

The receiving apparatus 1 has one configuration example as described above. Next, an example of a receiving method according to the one configuration example will be described with reference to FIG.
FIG. 2 is a flowchart illustrating a procedure example of TMCC acquisition processing. This TMCC acquisition process represents a process performed by each branch 20-23.

  In step S1, each branch 20 to 23 performs demodulation processing of TMCC data, and the frame synchronization detection unit 7 obtains a 16-bit OFDM frame synchronization signal (hereinafter referred to as “synchronization signal”) from the data sequence obtained by demodulation. ) Is detected. Hereinafter, the processing in step S1 is referred to as “synchronization signal detection processing”.

  After detecting the OFDM frame synchronization signal, in step S2, the TMCC decoding unit 8 receives TMCC information in which information such as transmission parameters is stored. In step S <b> 3, the TMCC decoding unit 8 decodes the TMCC information immediately after the reception of the TMCC information and transmits the TMCC information to the TMCC controller 16.

  The TMCC data is encoded with error correction (184, 102) in TMCC information. Therefore, in step S5, it is determined whether error correction is possible. If error correction is possible, the TMCC decoding unit 8 performs error correction processing after the end of one OFDM frame. If error correction is possible here, the corrected output is sent to the TMCC controller 16 and step S6 is executed. In step S6, the TMCC decoding unit 8 transmits TMCC information to the TMCC controller 16 again. On the other hand, if error correction is not possible, step S7 described later is executed.

  In step S7, the frame synchronization detection unit 7 confirms that one OFDM frame data has been received, and confirms the synchronization signal at the head of the next OFDM frame. If the synchronization signal of the next OFDM frame is not detected, the initial synchronization detection is an erroneous determination, and the process returns to the synchronization signal detection process (corresponding to step S1) again. On the other hand, when a synchronization signal is detected, OFDM frame synchronization is established. Since TMCC data is transmitted by being superimposed on each OFDM frame, the above processing is repeated until it is initialized by a channel change or the like.

FIG. 3 is a flowchart showing a processing example of the TMCC controller 16.
The TMCC controller 16 performs processing for determining TMCC information and processing when TMCC information is changed from the TMCC data transmitted from each of the branches 20 to 23.

  In step S11, demodulation is started using the initial value. In step S11, the TMCC controller 16 stores the layer configuration information, deinterleave information, and demapping information, which the reception apparatus 1 has in advance, which is necessary for the TS data reconfiguration process, after initialization by channel change or the like. The initial value setting is transmitted to the controller 17. The TS playback unit 15 starts reconstruction of TS data based on these pieces of information.

  In step S12, TMCC information is acquired from each branch 20-23. Specifically, each of the branches 20 to 23 receives a reception signal, and when TMCC information necessary for demodulating transmission data is obtained from the reception signal, the TMCC information is handed over to the TMCC controller 16 immediately. Here, “immediately deliver the TMCC information” indicates that the TMCC information is delivered without confirming that there is no error after the error correction of the TMCC information.

  Next, in step S13, the TMCC controller 16 determines whether there is a difference between the TMCC information. The TMCC controller 16 determines whether or not new TMCC data acquired thereafter by the branches 20 to 23 is different from internal TMCC data.

  When there is a difference in the TMCC information obtained from each of the branches 20 to 23, the TMCC controller 16 performs the majority process S100 and determines the TMCC information. Here, the TMCC controller 16 sets the TMCC information of a specific branch as a confirmed value when the TMCC information is not confirmed in the majority process S100. On the other hand, in step S13, when there is no difference in the TMCC information obtained from each branch 20-23, step S14 mentioned later is implemented.

  Next, in step S14, the TMCC controller 16 determines whether the TMCC information received for the first time after initialization such as channel change is different from the internal TMCC information held. When the TMCC information received for the first time is different from the internal TMCC information held, the TMCC controller 16 executes Step S15.

  In this step S15, the TMCC controller 16 immediately updates the internal TMCC information and reflects it in the TS data reconstruction process. On the other hand, the TMCC controller 16 executes Step S16. In step S16, it is determined whether or not the synchronization of the OFDM frame has been established.

  When the synchronization of the OFDM frame is not established, the TMCC controller 16 returns to the above-described step S12, and when the synchronization of the OFDM frame is established, the TMCC controller 16 executes step S17 described later. In this step S17, since it is the same process as step S12 mentioned above, description is abbreviate | omitted.

  Next, in step S18, the TMCC controller 16 determines whether there is a difference between the TMCC information as in step S13 described above. That is, the TMCC controller 16 determines whether or not the new TMCC data acquired thereafter by the branches 20 to 23 is different from the recently acquired internal TMCC data.

  When there is a difference in the TMCC information obtained from each of the branches 20 to 23, the TMCC controller 16 performs the majority process S100 and determines the TMCC information.

  Next, in step S19, the TMCC controller 16 receives TMCC information from each of the branches 20 to 23, and compares whether the new TMCC information obtained by the majority processing S100 is different from the internal TMCC information.

  After the first time, the TMCC controller 16 receives TMCC information from each of the branches 20 to 23, and when the new TMCC information obtained by the majority processing S100 is different from the internal TMCC information, executes the step S23 described later.

  On the other hand, when there is no problem in the reception status and proper reception is continued, processing for updating the internal transmission parameter information to a new value is performed according to the transmission parameter switching index (steps S20 and S21). That is, when the transmission parameter switching index becomes “0”, the internal TMCC information transmission parameter information is updated and reflected in the TS data reconfiguration process. That is, in step S20, the value of the transmission parameter switching index included in the acquired TMCC information is confirmed.

  If the transmission parameter switching index is “0” in step S20, step S21 is performed before step S22. If the transmission parameter switching index is not “0x0”, step S21 is not performed and step S22 is performed. To be implemented.

  In step S22, if there is no difference between the received TMCC information and the internal TMCC information, a mismatch confirmation flag (corresponding to the Disc_Flag shown) and a continuation counter (corresponding to the Disc_Count shown) are initialized.

  On the other hand, if it is determined in step S19 that there is a difference, in step S23 described above, the TMCC controller 16 sets a mismatch confirmation flag that is a control flag that clearly indicates that the new TMCC information is different from the internal TMCC information. To do. By setting the inconsistency flag, the controller 17 can control the output from the TS data reconstruction unit 15 and minimize the influence on the receiving apparatus 1.

  In step S24, the TMCC controller 16 determines whether or not new TMCC information has changed after the mismatch confirmation flag is set. If the TMCC information has changed in this way, the TMCC controller 16 initializes the Disccount, while if the TMCC information has not changed in this way, Step TM25 is performed.

  In this step S25, the TMCC controller 16 increases Disc Count by “1”. Next, in step S26, the TMCC controller 16 compares the set threshold value with the disc count. The TMCC controller 16 returns to and executes step S17 when the Disc count is smaller than the set threshold value, and executes step S27 when the disc count is greater than the set threshold value. In step S <b> 27, the TMCC controller 16 updates the internal TMCC information to new TMCC information and delivers it to the controller 17. The TMCC controller 16 performs the above-described series of processing for each OFDM frame.

  On the other hand, a value that can be set by the user is used as a threshold value, and it is determined whether the value of the RecordCount exceeds it. If it exceeds, the internal TMCC information is updated to new TMCC information, and the parameter is reflected in the TS data reproduction process. Thereafter, the mismatch confirmation flag and the value of DiscCount are initialized. The reason why the Disc count is compared with the threshold value is that it is assumed that the TMCC information itself is erroneously received due to a reception error. However, when there is no difference between the internal TMCC information and the new TMCC information, the mismatch confirmation flag and the value of DiscCount are initialized immediately.

FIG. 4 is a flowchart showing a detailed procedure example of the majority process S100 shown in FIG.
In step S201, the TMCC controller 16 confirms whether OFDM frame synchronization is established. The reason for this confirmation is that TMCC information is acquired without waiting for an error correction result of TMCC information immediately after initialization such as immediately after a channel change. In the steady state after the OFDM frame synchronization is established, step S202 for checking the TMCC error correction result is performed.

  In step S202, the TMCC controller 16 confirms whether valid TMCC information that has been successfully error-corrected in a steady state after the establishment of the OFDM frame has been acquired from each of the branches 20-23.

  If the error after error correction does not become zero in all branches 20 to 23, the TMCC controller 16 determines that the majority process cannot be performed, stops acquiring new TMCC information, and stops the majority process.

  When the error after error correction becomes zero in any of the branches 20 to 23, the TMCC controller 16 executes Step S203. In step S203, the TMCC controller 16 determines whether or not the majority of the TMCC data of the branches 20 to 23 having no error is possible by the error correction process. The TMCC controller 16 determines that majority processing is impossible when different TMCC data is acquired after error correction in the same number of branches 20-23. For example, the case of 2: 1 or 1: 1 corresponds to this. On the other hand, if practicable, majority processing is performed to determine TMCC information obtained from the branch as new TMCC information.

  In step S203, when the TMCC controller 16 determines that the majority process cannot be performed, it executes step S205. In step S205, the TMCC controller 16 confirms whether OFDM frame synchronization is established again. In addition to the purpose of determining whether it is immediately after initialization as in step S201, this confirmation is performed because the steady state is not reached and the majority process cannot be performed. This is because the TMCC information that has been deleted is discarded and the acquisition of new TMCC information is stopped.

  If the OFDM frame is synchronized in step S205, the TMCC controller 16 executes user processing (step S206). This step S206 is a process intended by the user (hereinafter referred to as “user process”) when the majority process cannot be performed because the TMCC information acquired from each of the branches 20 to 23 is the same number, such as 2 to 2 or 1 to 1. Represents a process for determining new TMCC information.

<First Example of User Processing>
In step S206, the majority processing described above is performed such that there are a plurality of types of TMCC information acquired from each branch and the contents of the TMCC information obtained from the branches 20 to 23 (four in this example) are all different. In the case where it cannot be performed, the TMCC controller 16 may determine the TMCC information acquired from the smallest branch number assigned to a plurality of existing branches as new TMCC information.

<Second Example of User Processing>
In step S206, there are a plurality of types of TMCC information acquired from the respective branches 20 to 23, and the types and the number of TMCC information acquired from the acquired branches 20 to 23 (four in this example, which is an example of an even number). When the numbers are the same as 2 to 2, respectively, the TMCC controller 16 may select new TMCC information as follows.

  That is, in the TMCC controller 16, the C / N values of the branches 20 to 23 having acquired the TMCC information are sufficiently better than the C / N values necessary for demodulating the DBPSK method that is a modulation method of the carrier on which the TMCC information is transmitted. The TMCC information of a specific branch from which the best C / N value is obtained is selected as new TMCC information. The C / N value necessary for demodulating the DBPSK method can be set by the user. If there is no specific branch that reaches the threshold, the received TMCC information is discarded and not new TMCC information.

<Third example of user processing>
In step S206, there are a plurality of types of TMCC information acquired from each of the branches 20 to 23, and the types and the number of TMCC information from the acquired branches (4 in this example) are 2 to 2, respectively. If the numbers are the same, the TMCC controller 16 may select new TMCC information as follows.

  That is, the TMCC controller 16 adds the internal TMCC information to the majority process candidate and performs the determination. When the number of TMCC controllers 16 is, for example, 2 to 2, the internal TMCC information is further added to the candidates, so that a majority decision by five parties (5 pieces of TMCC information) is performed. Also in this method, when the TMCC controller 16 cannot make a decision by majority processing such as 2-to-2: 1, the received TMCC information is discarded and is not used as new TMCC information.

<Fourth example of user processing>
In the fourth example of the user process, the TMCC controller 16 uses the CPS that can be DBPSK demodulated as described in the above-described embodiment to obtain TMCC information candidates acquired by the branch in the process described in the third example of the user process. Limit / N value as a threshold value.

  That is, the TMCC controller 16 performs majority processing using all the TMCC information obtained from the branches 20 to 23 having the C / N value sufficient for DBPSK demodulation and the internal TMCC information as candidates. Even if the internal TMCC information is used, if TMCC information cannot be selected by majority processing as in one-to-one one-to-one, the acquired TMCC information is discarded and not used as new TMCC information.

  As described above, the terrestrial digital broadcast receiving device 1 (corresponding to the receiving device) in the present embodiment double-tunes the received signal received independently by the plurality of antennas, and includes each of the received signals. There is a difference in the contents of the plurality of branches 20 to 23 that acquire transmission data and each control data (TMCC data) superimposed on each transmission data, and the contents of each control data acquired in each of the branches 20 to 23 Control data selection means 16 (TMCC controller) for selecting specific control data that is the same and occupies a large number of the control data, and the specific control data selected by the control data selection means 16 Is used to reconstruct the transport stream data by combining the plurality of transmission data, and reconstructing means 14 and 15 (diver combination). Parts, and having a TS data reconstruction unit).

  The digital terrestrial broadcast receiving method according to the present embodiment demodulates received signals received independently by a plurality of antennas, and each transmission data included in each received signal and each control superimposed on each transmission data. Control that selects specific control data that is the same and occupies a large number of the control data when there is a difference in the contents of the control data acquired in a plurality of branches that acquire data (TMCC data) A data selection step; and a reconstruction step of reconstructing transport stream data by combining the plurality of transmission data using the specific control data selected in the control data selection step. And

  In this way, when a plurality of received signals are received simultaneously from a plurality of broadcasting stations, even if there are a plurality of types of control data corresponding to each of these broadcasting stations, transmission data occupying a large number The transport stream data can be reliably output from these transmission data groups using appropriate specific control data corresponding to the groups.

  In other words, for example, appropriate specific control can be performed even in the situation described above, which is different from the case where a plurality of types of control data exist internally due to data corruption or the like although a reception signal is received from one broadcasting station. Transport stream data can be reliably output using the data.

  In the terrestrial digital broadcast receiving apparatus 1 in the above embodiment, in addition to the above-described configuration, the branches 20 to 23 further include error correction means for performing error correction after receiving each of the control data, and the error correction means The control data for which error correction is disabled by the above is discarded.

  In this way, the receiving device 1 can always perform reception processing using accurate control data.

  In the terrestrial digital broadcast receiving apparatus 1 in the above embodiment, in addition to the above-described configuration, the control data selection unit 16 further has a difference in the plurality of control data received in the plurality of branches 20 to 23. The control data that is the same and has the largest number among the plurality of control data is selected.

  In this way, the terrestrial digital broadcast receiving apparatus 1 selects one control data to specify a reception signal to be received even in a situation where the reception state is not good, and is in a state suitable for reception of the reception signal. Can be set.

  In addition to the above-described configuration, the terrestrial digital broadcast receiving apparatus 1 in the embodiment further includes the control data when there are a plurality of specific control data that are the same and have the largest number among the plurality of control data. The selection means 16 is characterized by selecting control data acquired in a predetermined specific branch.

  In the terrestrial digital broadcast receiving apparatus 1 in the above embodiment, in addition to the above-described configuration, the branches 20 to 23 further include error correction means for performing error correction after receiving each of the control data, and after initialization processing The control data received for the first time is not subjected to error correction processing by the error correction means, and is delivered to the control data selection means 16 as soon as the control data used by the reconfiguration means 14 and 15 is received. Features.

  In this way, for example, when the branches 20 to 23 immediately hand over the control data only for the first time, the branch data 20 can start demodulating the transmission data faster than the conventional method because the control data is not corrected.

  In addition, this embodiment is not restricted above, A various deformation | transformation is possible. Hereinafter, such modifications will be described in order.

  In the above embodiment, the number of branches 20 and the like is exemplified as four, but the number of branches may be plural. In this way, the receiving device 1 can reliably identify one TMCC information by the majority process.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

It is a block diagram which shows the electrical structural example of the receiver as one Embodiment. It is a flowchart which shows the example of a procedure of a TMCC acquisition process. It is a flowchart which shows the process example of a TMCC controller. It is a flowchart which shows the detailed example of a procedure of the majority process shown in FIG.

Explanation of symbols

1 Receiver (Digital Terrestrial Broadcasting Receiver)
16 TMCC controller (control data selection means)
20 branches 21 branches 22 branches 23 branches

Claims (6)

A plurality of branches for demodulating each received signal independently received by a plurality of antennas and obtaining each transmission data included in each received signal and each control data superimposed on each transmission data;
When there is a difference in the content of the control data acquired in each branch, control data selection means for selecting specific control data that is the same and occupies a large number among the plurality of control data;
Terrestrial digital broadcast reception comprising: reconfiguration means for reconstructing transport stream data by combining the plurality of transmission data using the specific control data selected by the control data selection means apparatus. In the terrestrial digital broadcast receiver according to claim 1,
The branch is
Error correction means for performing error correction after receiving each of the control data;
A terrestrial digital broadcast receiving apparatus characterized by discarding the control data in which error correction is disabled by the error correction means. In the terrestrial digital broadcast receiver according to claim 2,
The control data selection means includes
The terrestrial digital, wherein when there is a difference between the plurality of control data received in the plurality of branches, the same and the largest number of specific control data is selected from the plurality of control data Broadcast receiving device. The terrestrial digital broadcast receiver according to claim 3,
In the case where there are a plurality of specific control data that are the same and have the largest number among the plurality of control data,
The terrestrial digital broadcast receiving apparatus, wherein the control data selection means selects control data acquired in a predetermined specific branch. In the terrestrial digital broadcast receiver according to claim 4,
The branch is
Error correction means for performing error correction after receiving each of the control data;
The control data received for the first time after the initialization processing is not subjected to error correction processing by the error correction means, but is immediately delivered to the control data selection means as soon as each control data used by the reconfiguration means is received. A terrestrial digital broadcast receiving device. Each demodulated received signal received by each of the plurality of antennas, and acquired in a plurality of branches for acquiring each transmission data included in each received signal and each control data superimposed on each transmission data When there is a difference in the content of the control data, a control data selection step of selecting specific control data that is the same and occupies a large number among the plurality of control data;
Terrestrial digital broadcasting, comprising: a reconstruction step of reconstructing transport stream data by combining the plurality of transmission data using the specific control data selected in the control data selection step Reception method.

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