JP5845119B2 - Transmitting station specifying device, transmitting station specifying method, and program - Google Patents

Description

  The present invention relates to a technique for identifying a transmitting station that broadcasts by a received broadcast wave.

  In general, in the SFN (Single Frequency Network) of terrestrial digital broadcasting, it is important to grasp the influence of delayed waves. For this reason, it is important to detect a direct wave or a delayed wave, and a technique for measuring a delay profile necessary for detecting a direct wave or a delayed wave is disclosed (for example, Patent Document 1).

The delay profile measuring device disclosed in Patent Document 1 receives an OFDM (Orthogonal Frequency Division Multiplexing) type radio wave that has arrived via different propagation paths, samples the received signal, and performs arithmetic processing to obtain each incoming signal. Waveform information including wave arrival timing and intensity is obtained as a delay profile. On the other hand, side lobe data equivalent to the side lobe error of the incoming wave appearing in the waveform information of the delay profile is generated by the processing of the delay profile, and the side of the obtained delay profile is generated using the generated side lobe data. This is to suppress and correct the lobe error.
With the above configuration, the side lobe error included in the measurement result of the delay profile measurement unit can be suppressed, the accurate intensity of each incoming wave can be obtained, and the presence of weak radio waves buried in the side lobe And its delay profile.

JP 2008-066858 A

  As described above, there is a technique for detecting a direct wave or a delayed wave by analyzing a delay profile, but a technique for specifying a transmitting station that transmits a broadcast wave is not disclosed.

  Therefore, the problem to be solved by the present invention is to solve the above-mentioned problems and to provide a technique for identifying a transmitting station using a delay profile.

  The present invention for solving the above-mentioned problem is a transmitting station specifying device, wherein the receiving means receives a broadcast wave transmitted from a predetermined transmitting station, and has the same contents as the broadcast wave transmitted from the transmitting station. Reference broadcast wave generating means for generating a reference broadcast wave by modulating the TS signal so that it becomes a broadcast wave having the same frequency as the broadcast wave from the transmitting station, and the received broadcast wave and the reference broadcast wave. Based on a delay profile generating means for generating a delay profile based on the delay amount between the reference broadcast wave and the received broadcast wave indicated in the generated delay profile, the transmitting station that has transmitted the received broadcast wave is identified. And a specific means for performing.

  The present invention for solving the above-mentioned problem is a transmitting station specifying method, wherein a receiving step for receiving a broadcast wave transmitted from a predetermined transmitting station, and a broadcast wave transmitted from the transmitting station have the same contents. A reference broadcast wave generating step for generating a reference broadcast wave by modulating the TS signal so that it becomes a broadcast wave having the same frequency as the broadcast wave from the transmitting station, and the received broadcast wave and the reference broadcast wave. Based on a delay profile generation step for generating a delay profile based on the delay amount between the reference broadcast wave and the received broadcast wave indicated in the generated delay profile, the transmitting station that has transmitted the received broadcast wave is identified. And a specific step.

  The present invention for solving the above-mentioned problem is a program of a transmitting station specifying device, wherein the program receives the specifying device from a receiving means for receiving a broadcast wave transmitted from a predetermined transmitting station, and the transmitting station. A reference broadcast wave generating means for generating a reference broadcast wave by modulating a TS signal having the same content as a broadcast wave to be transmitted to a broadcast wave having the same frequency as the broadcast wave from the transmitting station; Based on a delay profile generating means for generating a delay profile based on the received broadcast wave and the reference broadcast wave, and based on a delay amount between the reference broadcast wave and the received broadcast wave shown in the generated delay profile, It is characterized by functioning as a specifying means for specifying a transmitting station that has transmitted a received broadcast wave.

  According to the present invention, the transmitting station can be specified using the delay profile of the received broadcast wave.

It is the schematic of the broadcast system in this application. It is a block diagram which shows an example of the transmitting station specific apparatus of this application. It is a figure for demonstrating the pattern memorize | stored in a delay profile pattern memory | storage part. It is a flowchart for demonstrating operation | movement of a 1st form. It is an example of the delay profile produced | generated by the delay profile production | generation part. It is a flowchart for demonstrating the operation | movement of a 2nd form. It is an example of a broadcast system. It is an example of the pattern memorize | stored in a delay profile pattern memory | storage part. It is an example of the delay profile produced | generated by the delay profile production | generation part. It is the graph which showed the relationship between delay amount and the number of data acquisition. It is a block diagram which shows an example of the transmitting station identification apparatus in 4th Embodiment. It is a block diagram which shows an example of an adjustment part. It is a flowchart for demonstrating operation | movement of 4th Embodiment.

  The invention of the present application is a reference that is a reference in which a broadcast wave transmitted from a transmission station and a TS (Transport Stream) signal having the same content as the broadcast wave transmitted from the transmission station are modulated in the same manner as the broadcast wave from the transmission station A delay profile is generated based on the broadcast wave, and the transmitting station that sent the received broadcast wave is specified based on the delay amount between the reference broadcast wave and the received broadcast wave indicated in the generated delay profile. It is characterized by.

  In order to describe the features of the present invention in detail, the following description is made with reference to the drawings.

<First Embodiment>
First, the first embodiment will be described.

  The broadcasting system of the present invention is configured by a single frequency network (SFN) and includes a transmitting station 1 and a transmitting station specifying device 2 as shown in FIG.

  The transmitting station 1 is a transmitting station that modulates a TS (Transport Stream) signal generated by a broadcasting station using a predetermined modulation method and transmits the modulated signal as a digital broadcast wave (RF). In the following description, it is assumed that a broadcast wave modulated by OFDM (Orthogonal Frequency Division Multiplexing) is transmitted, but the modulation method may be other than OFDM. Further, in the following description, the transmitting station 1 will be described using a configuration in which two transmitting stations 1A and 1B are provided.

  As shown in FIG. 2, the transmitting station specifying apparatus 2 includes a receiving unit 201, a TMCC unit 202, a modulating unit 203, a delay profile generating unit 204, a delay profile pattern storage unit 205, a comparing unit 206, a specifying unit 207, and an IF / RF. A conversion unit 208 is included.

  The receiving unit 201 receives a broadcast wave transmitted from the transmitting station 1.

  A TMCC (Transmission and Multiplexing Configuration and Control) unit 202 detects a modulation parameter such as a mode, a guard interval, and a carrier modulation method of the signal received by the receiving unit 201.

The modulation unit 203 receives a TS signal having the same content as the broadcast wave received by the reception unit 201 (the broadcast wave transmitted from the transmission station 1). Then, according to the modulation parameter and the reference clock detected by the TMCC unit 202, the modulation unit 203 is configured such that the modulation parameter, IFFT sample frequency, guard interval period, and the like are received by the reception unit 201. Alternatively, the input TS signal is modulated so as to be the same as the IFFT sample frequency, the guard interval period, or the like. The signal level is preferably controlled to a level that makes it easy to distinguish the reference broadcast wave and the received broadcast wave.
Further, the modulation unit 203 adjusts the time accumulated in the internal memory, and generates a reference broadcast signal with a delay amount of “0” for the broadcast wave received by the reception unit 201.
In the following description, the delay amount between the reference broadcast wave and the broadcast wave transmitted from the transmitting station 1A is 18 μs, and the delay amount between the reference broadcast wave and the broadcast wave transmitted from the transmitting station 1B is 35 μs. Next, the case where the reference broadcast wave is generated so that the delay amount between the broadcast waves is equal will be described. Further, the reference broadcast signal generated by the modulation unit 203 has a radio wave intensity different from the radio wave intensity of the received broadcast wave when the transmitting station is operating normally so that it can be easily distinguished from the broadcast wave received by the reception unit 201. In the following description, a case where the radio wave intensity of the reference broadcast wave is generated will be described.

  The IF / RF conversion unit 208 can maintain the same SFN relationship as the broadcast wave received by the reception unit 201 so as to have the same frequency as the broadcast wave received by the reception unit 201 according to the reference clock. As described above, the reference broadcast signal output from the modulation unit 203 is converted from IF to RF, and a reference broadcast wave is output.

  The delay profile generation unit 204 analyzes the received broadcast wave received by the reception unit 201 and the reference broadcast wave output from the IF / RF conversion unit 208, and generates a delay profile.

  The delay profile pattern storage unit 205 stores a delay profile pattern indicating the relationship between the delay amount between the reference broadcast wave and the received broadcast wave. This delay profile pattern is created in advance from the reference broadcast wave and the broadcast wave from each transmitting station. An example is shown in FIG. As described above, the reference broadcast wave is generated so that the delay amount with respect to the broadcast wave transmitted from the transmitting station 1A is 18 μs and the delay amount with respect to the broadcast wave transmitted from the transmitting station 1B is 35 μs. Therefore, the delay profile pattern is also generated with the same amount of delay. (A) has shown the pattern of the delay profile produced | generated based on the reference | standard broadcast wave. (B) has shown the pattern of the delay profile produced | generated based on the reference | standard broadcast wave and the broadcast wave sent from the transmitting station 1A. (C) has shown the pattern of the delay profile produced | generated based on the reference | standard broadcast wave and the broadcast wave transmitted from the transmission station 1B. (D) has shown the pattern of the delay profile produced | generated based on the reference | standard broadcast wave, the broadcast wave sent out from the transmitting station 1A, and the broadcast wave sent out from the transmitting station 1B.

  The comparison unit 206 compares the delay profile generated by the delay profile generation unit 204 with each pattern stored in the delay profile pattern storage unit 205, and determines which pattern is closer.

  The identifying unit 207 selects a transmitting station that transmits the broadcast wave received by the receiving unit 201 based on the pattern determined by the comparing unit 206 as being close to the delay profile generated by the delay profile generating unit 204. Identify. For example, when the comparison unit 206 determines that the pattern is close to the pattern shown in FIG. 3A, it recognizes that no broadcast wave is transmitted from either transmitting station. When the comparison unit 206 determines that the pattern is close to the pattern shown in FIG. 3B, it is specified that the broadcast wave from the transmitting station 1A is received. When the comparison unit 206 determines that the pattern is close to the pattern shown in FIG. 3C, it is specified that the broadcast wave from the transmitting station 1B is received. When the comparison unit 206 determines that the pattern is close to the pattern shown in FIG. 3D, it is specified that broadcast waves from the transmitting station 1A and the transmitting station 1B are received.

  Next, the operation will be described with reference to the flowchart of FIG. It is assumed that each pattern is already stored in the delay profile pattern storage unit 205.

  The receiving unit 201 receives a broadcast wave (step S401).

  The TMCC unit 202 detects the modulation parameter of the signal received by the receiving unit 201 (step S402).

  The modulation unit 203 modulates the TS signal based on the detected modulation parameter and the reference clock, and the IF / RF conversion unit 208 outputs a reference broadcast wave having the same frequency as the broadcast wave received by the reception unit 201 based on the reference clock. (Step S403).

  The delay profile generation unit 204 analyzes the received broadcast wave received by the reception unit 201 and the reference broadcast wave generated by the modulation unit 203, and generates a delay profile (step S404).

  The comparison unit 206 compares the delay profile generated by the delay profile generation unit 204 with each pattern stored in the delay profile pattern storage unit 205 (step S405).

  The comparison unit 206 first compares with the pattern (a) (step S406). If the comparison unit 206 determines that the pattern is close to the pattern (a) as a result of the comparison (step S406: YES), the specifying unit 207 estimates that no broadcast wave is transmitted from any transmitting station (step S410). On the other hand, when it is not determined that the pattern is close to the pattern (a) (step S406: NO), the comparison unit 206 compares with the pattern (b) (step S407). As a result of the comparison, when the comparison unit 206 determines that the pattern is close to the pattern (b) (step S407: YES), the received broadcast wave is specified as a broadcast wave from the transmitting station 1A (step S411).

  If it is not determined that the pattern is close to the pattern (b) (step S407: NO), the comparison unit 206 compares the pattern (c) (step S408). If the comparison unit 206 determines that the pattern is close to the pattern (c) as a result of the comparison (step S408: YES), the received broadcast wave is identified as a broadcast wave from the transmitting station 1B (step S412).

  Furthermore, when it is not determined that the pattern is close to the pattern (c) (step S408: NO), the comparison unit 206 compares the pattern (d) (step S409). If the comparison unit 206 determines that the pattern is close to the pattern (d) as a result of the comparison (step S409: YES), the received broadcast wave is specified as a broadcast wave from the transmitting stations 1A and 1B (step S413).

  As a result of the comparison, when it is not determined that any pattern is close (step S409: NO), the process returns to step S401.

  In the above embodiment, the transmitting station is specified by comparing with each pattern stored in the delay profile pattern storage unit 205, but another method may be used. An example will be described. The delay amount of the broadcast wave transmitted from each transmitting station is stored in advance in the delay profile pattern storage unit 205 for each transmitting station. Then, based on the delay profile created by the delay profile generation unit 204, the delay difference between the received broadcast wave and the reference broadcast wave is calculated. By comparing the calculated delay difference with the delay amount stored in the delay profile pattern storage unit 205, the transmitting station that has transmitted the received broadcast wave may be specified.

  In the above embodiment, the TMCC unit 202 detects the modulation parameter every time, and the description has been made using the configuration in which the TS signal is modulated based on the detected modulation parameter. However, the modulation parameter detected at the initial operation or periodically is used. The TS signal may be modulated based on the above.

  In the above embodiment, the reference broadcast wave converted from IF to RF by the IF / RF conversion unit 208 is input to the delay profile generation unit 204. However, the reference broadcast wave converted to RF is received. The unit 201 may be configured to receive the mixed broadcast wave and the received broadcast wave.

  In the above embodiment, the delay profile pattern storage unit 205 obtains the delay profile pattern indicating the relationship between the delay amount between the reference broadcast wave and the received broadcast wave from the reference broadcast wave and the broadcast wave from each transmitting station. As a method of creating in advance, for example, comparison data can be created based on a delayed wave event list analyzed by the delay profile generation unit 204.

  According to the above embodiment, the transmitting station can be identified using the delay profile of the received broadcast wave.

<Second Embodiment>
Next, a second embodiment will be described. In addition, the same number is attached | subjected about the structure similar to the said embodiment, and detailed description is abbreviate | omitted.

  In addition to the operation of the first embodiment, the comparison unit 206 of the present embodiment monitors the radio wave intensity of the received broadcast wave and determines whether it is lower than the threshold value. The details of the comparison unit 206 of the present embodiment will be described below with an example. The description will be made using the case where the threshold is set to −20 dB.

  For example, assume that the delay profile generation unit 204 generates a delay profile as shown in FIG. Then, the comparison unit 206 first determines which pattern is close. In the case of the pattern shown in FIG. 5A, since the delay difference between the reference broadcast wave and the received broadcast wave is 18 μs, the comparison unit 206 changes the pattern (b) shown in FIG. Judge as close. Further, the comparison unit 206 determines whether or not the radio wave intensity of the received broadcast wave is lower than a threshold value. In the example shown in FIG. 5A, since the radio wave intensity of the received broadcast wave is lower than the threshold “−20 dB”, the comparison unit 206 has a delay profile generated by the delay profile generation unit 204 close to the pattern (b). The specifying unit 207 is notified of the fact and the fact that the radio wave intensity is lower than the threshold value. Upon receiving this notification, the identifying unit 207 recognizes that the received broadcast wave is from the transmitting station 1A and that the radio wave intensity has decreased due to some trouble occurring at the transmitting station 1A. .

  For example, assume that a delay profile as shown in FIG. 5B is generated by the delay profile generation unit 204. Then, the comparison unit 206 first determines which pattern is close. The comparison unit 206 determines that the delay difference between the reference broadcast wave and the received broadcast wave is 18 μs and 35 μs, and thus is close to the pattern (d). The comparison unit 206 further determines whether or not the radio wave intensity of each received broadcast wave is lower than a threshold value. In the example shown in FIG. 5B, since the radio wave intensity of the received broadcast wave with a delay difference of 18 μs is lower than the threshold “−20 dB”, the comparison unit 206 generates the delay profile generated by the delay profile generation unit 204. The specifying unit 207 is notified of the fact that it is close to the pattern (d) and that the radio wave intensity of the broadcast wave having a delay difference of 18 μs is lower than the threshold value. Upon receiving this notification, the identifying unit 207 confirms that the received broadcast waves are from the transmitting stations 1A and 1B, and that the radio field strength has decreased due to some trouble occurring at the transmitting station 1A. recognize.

The comparison section 206 as a delay profile generated by the delay profile generator 204 determines that the closer in FIG. 3 (a), is not transmitted is a broadcast wave from a specific unit 208 are all transmitting stations, Both transmitting stations 1A and 1B recognize that some trouble has occurred.

  Next, the operation of the present embodiment will be described using the flowchart of FIG. Step S405 up to step S405 is the same as that in the above embodiment, and will be described from step S406.

  The comparison unit 206 compares with the pattern (a) (step S406). If the comparison unit 206 determines that the pattern is close to the pattern (a) as a result of the comparison (step S406: YES), the specifying unit 207 estimates that no broadcast wave is transmitted from any transmitting station (step S410). The identification unit 208 recognizes that some trouble has occurred in both the transmitting stations 1A and 1B, assuming that no broadcast wave is transmitted from any transmitting station (step S416).

  When it is not determined that the pattern is close to the pattern (a) (step S406: NO), the comparison unit 206 compares with the pattern (b) (step S407). As a result of the comparison, when the comparison unit 206 determines that the pattern is close to the pattern (b) (step S407: YES), the received broadcast wave is specified as a broadcast wave from the transmitting station 1A (step S411). Further, the comparison unit 206 compares whether the radio wave intensity of the received broadcast wave is equal to or lower than the threshold (step S414). As a result of the comparison, if it is determined that it is not less than the threshold value (step S414: NO), it is recognized that the transmitting station 1A is operating normally (step S415). On the other hand, if it is determined as a result of the comparison that it is equal to or less than the threshold (step S414: YES), it is recognized that a trouble has occurred at the transmitting station 1A (step S416).

  When it is not determined that the pattern is close to the pattern (b) (step S407: NO), the comparison unit 206 compares the pattern (c) (step S408). If the comparison unit 206 determines that the pattern is close to the pattern (c) as a result of the comparison (step S408: YES), the received broadcast wave is identified as a broadcast wave from the transmitting station 1B (step S412). Further, the comparison unit 206 compares whether the radio wave intensity of the received broadcast wave is equal to or lower than the threshold (step S414). As a result of the comparison, if it is determined that it is not less than the threshold value (step S414: NO), the transmitting station 1B is recognized as operating normally (step S415). On the other hand, if it is determined as a result of the comparison that it is equal to or less than the threshold (step S414: YES), it is recognized that a trouble has occurred at the transmitting station 1B (step S416).

  If it is not determined that the pattern is close to the pattern (c) (step S408: NO), the comparison unit 206 compares the pattern (d) (step S409). If the comparison unit 206 determines that the pattern is close to the pattern (d) as a result of the comparison (step S409: YES), the received broadcast wave is specified as a broadcast wave from the transmitting stations 1A and 1B (step S413). Further, the comparison unit 206 compares whether the radio wave intensity of the received broadcast wave is equal to or lower than the threshold (step S414). As a result of the comparison, if it is determined that each of the transmitting stations 1A and 1B is not below the threshold (step S414: NO), it is recognized that the transmitter is operating normally (step S415). On the other hand, if it is determined as a result of the comparison that it is equal to or less than the threshold value (step S414: YES), the transmitting station refers to the delay amount between the reference broadcast wave and the received broadcast wave, and which transmitting station has a problem. (Step S416).

  According to the present embodiment, it is possible to specify the transmitting station of the received broadcast wave and to monitor the operating state of the transmitting station.

<Third Embodiment>
A third embodiment will be described. In addition, the same number is attached | subjected about the structure similar to the said embodiment, and detailed description is abbreviate | omitted.

  In the present embodiment, in order to obtain real-time characteristics in the abnormality detection time, for example, when obtaining a delay profile using a scattered pilot (SP) carrier of ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) system, In this configuration, the number of SP data acquired from the receiving unit 201 is thinned out.

  FIG. 10 is a graph showing the relationship between the delay amount between the reference broadcast wave and the broadcast wave transmitted from a predetermined transmitting station, created based on the delay amount between the reference broadcast wave and the received broadcast wave. is there. Note that the delay amount on the vertical axis of the graph is, for example, the value of the time axis width of the delay profile in the transmission parameter of mode 3 of the ISDB-T system. This graph shows the relationship between the thinning rate when skipping the data acquisition for the SP carrier and the delay amount of the data that is stored in the delay profile pattern storage unit 205 and is compared by the comparison unit 206 Represents. The delay profile generation unit 204 refers to the graph based on the delay amount between the reference broadcast wave and the received broadcast wave, acquires the value of the number of data necessary for delay profile generation, and is equivalent to the number of necessary data. Get SP data.

  According to the present embodiment, since the number of SP data acquisitions is thinned out, delay profile analysis can be speeded up. In addition, when the above configuration is applied to the second embodiment, it is possible to provide real-time performance to the operation status detection. When the delay amount to be compared and specified is a small value, data acquisition can be skipped at a large rate, and the time from delay profile analysis to abnormality detection can be shortened by reducing the acquisition number.

  Furthermore, according to the present embodiment, it is considered effective when serial communication is used to acquire SP data in the receiving unit 201, or when a time is required for the data acquisition procedure including other hardware factors.

<Fourth embodiment>
A fourth embodiment will be described. In addition, the same number is attached | subjected about the structure similar to the said embodiment, and detailed description is abbreviate | omitted. In the fourth embodiment, the received signal received by the receiving unit 201 is also input to the modulating unit 203 as shown in FIG. In addition, an adjustment unit 2031 is configured in the modulation unit 203.

  The adjustment unit 2031 adjusts the amount of delay between the input TS signal including the delay amount for modulation and demodulation and the broadcast wave received by the reception unit 201. The adjustment unit 2031 includes a delay time measurement unit 2033 and a delay unit 2034 as illustrated in FIG.

  The delay time measurement unit 2033 measures the delay amount between the TS signal and the received broadcast wave. Hereinafter, as an example of a method for measuring the difference in delay amount, a method for calculating from the PCR (Program Clock Reference) of the TS signal is described, but another method may be used as long as the delay amount can be measured. The delay time measuring unit 2033 includes a counter A (not shown) and a counter B (not shown) that are self-running with the same clock. The delay time measuring unit 2033 takes out the PCR of the TS signal, sets the counter value of the PCR in the counter A, and further adds the counter based on the inputted reference clock signal. Further, the delay time measuring unit 2033 extracts the PCR of the received broadcast wave, sets the PCR counter value in the counter B, and further adds the counter based on the input reference clock signal. The delay time measuring unit 2033 simultaneously reads the counter values of the counter A and the counter B at an arbitrary timing, calculates the difference between the counter values, and outputs the modulated and demodulated values included in the counter value extracted from the received broadcast wave. Taking the delay amount into account, the delay amount of the delay unit 2034 is set.

  The delay unit 2034 generates a reference broadcast signal by delay adjusting the input TS signal based on the delay amount calculated by the delay time measurement unit 2033.

  In the above description, the configuration for adjusting the delay amount between the input TS signal including the modulation and demodulation delay amount and the broadcast wave received by the reception unit 201 has been described. It may be. For example, as indicated by the wavy arrow in FIG. 12, the signal is modulated in accordance with the modulation signal and the reference clock detected by the TMCC unit 202 or the TS signal via the delay unit 2034 added with the modulation and demodulation delay amount. The delay amount between the TS signal and the broadcast wave received by the receiving unit 201 may be adjusted.

  The operation will be described with reference to the flowchart of FIG. This operation is the detailed operation of step S403 described in the above embodiment.

  The delay time measurement unit 2033 extracts the PCR of the TS signal, sets the PCR counter value in the counter A (step S1301), and further adds the counter based on the input reference clock signal (step S1302). Subsequently, the delay time measuring unit 2033 extracts the received broadcast wave PCR, sets the PCR counter value in the counter B (step S1303), and further adds the counter based on the input reference clock signal (step S1303). S1304). The delay time measurement unit 2033 simultaneously reads the counter values of the counter A and the counter B at an arbitrary timing, and calculates the delay amount by adding the delay amounts for modulation and demodulation (step S1305). The delay unit 2034 adjusts the delay amount of the reference broadcast wave signal by adjusting the input TS signal based on the delay amount calculated by the delay time measurement unit 2033 (step S1306).

<Example 1>
An example of the first embodiment will be described. FIG. 7 shows an example of a broadcasting system in the present embodiment. In this embodiment, it is assumed that the transmitting stations are a T tower and an S tree.

  FIG. 8I shows a delay profile pattern of the reference broadcast wave. (Ii) shows the delay profile pattern of the reference broadcast wave and the broadcast wave from the S-tree. (Iii) shows the delay profile pattern of the reference broadcast wave and the broadcast wave from the T tower. (Iv) shows the delay profile pattern of the reference broadcast wave, the broadcast wave from the S-tree, and the broadcast wave from the T tower.

  When the reception unit 201 receives a broadcast wave, the comparison unit 206 compares the delay profile generated by the delay profile generation unit 204 with each pattern stored in the delay profile pattern storage unit 205.

  The comparison unit 206 first compares with the pattern (i), and if it is determined that the comparison unit 206 is close to the pattern (i), the specifying unit 207 estimates that no broadcast wave is transmitted from the S tree or the T tower.

  If it is not determined that the pattern is close to the pattern (i), the comparison unit 206 compares it with the pattern (ii). As a result of the comparison, if the comparison unit 206 determines that the pattern is close to the pattern (ii), the received broadcast wave is specified as a broadcast wave from the S tree.

  When it is not determined that the pattern is close to the pattern (ii), the comparison unit 206 compares it with the pattern (iii). If the comparison unit 206 determines that the pattern is close to the pattern (iii) as a result of the comparison, the received broadcast wave is specified as a broadcast wave from the T tower.

  If it is not determined that the pattern is close to the pattern (iii), the comparison unit 206 compares it with the pattern (iv). As a result of the comparison, if the comparison unit 206 determines that the pattern is close to the pattern (iv), the received broadcast wave is specified as a broadcast wave from the S tree and the T tower.

<Example 2>
An example of the second embodiment will be described with reference to FIG. FIG. 9 shows a delay profile generated by the delay profile generation unit 204. In the following description, the threshold for recognizing that a trouble has occurred is assumed to be −20 dB for the S tree and −30 dB for the T tower.

  When the reception unit 201 receives a broadcast wave, the comparison unit 206 compares the delay profile generated by the delay profile generation unit 204 with each pattern stored in the delay profile pattern storage unit 205.

  First, the comparison unit 206 compares with the pattern (i) and determines that it is not the pattern (i). Next, the comparison unit 206 compares with the pattern (ii) and determines that it is not the pattern (ii). Next, the comparison unit 206 compares with the pattern (iii) and determines that it is not the pattern (iii). Next, the comparison unit 206 determines that the pattern is closer to the pattern (iv) than the pattern (iv).

  As a result of the determination, the received broadcast wave is specified as a broadcast wave from the S-tree and the T tower.

  The comparison unit 206 compares the radio wave intensity of each received broadcast wave with each threshold value. In the example illustrated in FIG. 9, since the radio wave intensity of the broadcast wave having a delay amount with respect to the reference broadcast wave is 35 μs is lower than the threshold value −30 dB, the fact is notified to the specifying unit 207. The identifying unit 207 grasps that a trouble has occurred in the T tower.

  It is also possible to register a radio wave suspension period in advance and mask an abnormality notification due to the suspension.

  As apparent from the above description, the terminal of the present invention described above can be configured by hardware, but can also be realized by a computer program. In such a configuration, functions and operations similar to those of the above-described embodiment are realized by a processor that operates according to a program stored in a program memory. Note that only a part of the functions of the above-described embodiment can be realized by a computer program.

  Although the present invention has been described with reference to the embodiments and examples, the present invention is not necessarily limited to the above-described embodiments and examples, and various modifications can be made within the scope of the technical idea. I can do it.

1 transmitting station 2 transmitting station specifying apparatus 201 receiving unit 202 TMCC
203 Modulation Unit 204 Delay Profile Generation Unit 205 Delay Profile Pattern Storage Unit 206 Comparison Unit 207 Identification Unit 208 IF / RF Conversion Unit 2031 Adjustment Unit 2032 Modulation Unit 2033 Delay Time Measurement Unit 2034 Delay Unit

Claims (9)

A transmitter identification device,
Receiving means for receiving broadcast waves transmitted from a predetermined transmitting station;
Reference broadcast wave generation for generating a reference broadcast wave by modulating a TS signal having the same content as the broadcast wave transmitted from the transmission station so as to be a broadcast wave having the same frequency as the broadcast wave from the transmission station Means,
A delay profile pattern storage unit in which a plurality of delay profile patterns indicating a relationship between delay amounts between a reference broadcast wave and a broadcast wave transmitted from a predetermined transmission station are stored in advance;
Delay profile generating means for generating a delay profile based on the received broadcast wave received by the receiving means and the reference broadcast wave;
A transmitting station comprising: a specifying unit that compares the generated delay profile with a delay profile pattern stored in the delay profile pattern storage unit and specifies a transmitting station that has transmitted the received broadcast wave. Specific device. The specifying means includes a prepared delay amount between a reference broadcast wave and a broadcast wave transmitted from a predetermined transmitting station, and the received broadcast wave and the reference broadcast wave indicated in the generated delay profile. The transmitting station specifying apparatus according to claim 1, wherein the transmitting station that transmits the received broadcast wave is specified by comparing a delay amount between the transmitting station and the transmitting station. The reference broadcast wave generating means generates the reference broadcast wave so that the radio wave intensity of the reference broadcast wave is different from the radio wave intensity of the received broadcast wave when the transmitting station is operating normally. The transmitting station specifying apparatus according to claim 1 or 2 . The detection means for detecting whether or not the radio wave intensity of the received broadcast wave for which the transmitting station is specified by the specifying means is equal to or less than a threshold, and detecting the operating status of the transmitting station according to the comparison result. The transmitting station specifying device according to any one of claims 1 to 3 . The delay profile generating means, when said receiving means to obtain data of the pilot carrier for the pilot carrier, the received broadcast wave skipped acquired by number of data acquisition is set according to the delay amount, the based on the reference broadcast wave transmitting stations specifying device according to any of claims 1 to 4, characterized in that to generate the delay profile. The reference broadcast wave generating means includes adjustment means for adjusting the TS signal based on a delay amount between the modulated wave obtained by modulating the TS signal and the received broadcast wave. The transmitting station specifying device according to any one of claims 1 to 5 . A transmitter identification device,
Receiving means for receiving broadcast waves transmitted from a predetermined transmitting station;
Reference broadcast wave generation for generating a reference broadcast wave by modulating a TS signal having the same content as the broadcast wave transmitted from the transmission station so as to be a broadcast wave having the same frequency as the broadcast wave from the transmission station Means,
A delay profile pattern storage unit in which a plurality of delay profile patterns indicating a relationship between delay amounts between a reference broadcast wave and a broadcast wave transmitted from a predetermined transmission station are stored in advance;
Delay profile generating means for generating a delay profile between the received broadcast wave received by the receiving means and the reference broadcast wave;
A specifying unit that compares the generated delay profile with a delay profile pattern stored in the delay profile pattern storage unit and specifies a transmitting station that has transmitted the received broadcast wave;
Detecting means for comparing whether the radio wave intensity of the received broadcast wave whose transmitting station is specified by the specifying means is below a threshold and detecting the operating status of the transmitting station according to the comparison result
A transmitting station specifying device characterized by comprising: A transmitting station identification method,
A receiving step of receiving a broadcast wave transmitted from a predetermined transmitting station;
Reference broadcast wave generation for generating a reference broadcast wave by modulating a TS signal having the same content as the broadcast wave transmitted from the transmission station so as to be a broadcast wave having the same frequency as the broadcast wave from the transmission station Steps,
A delay profile generating step for generating a delay profile based on the received broadcast wave received by the receiving means and the reference broadcast wave;
Delay profile pattern storage in which a plurality of delay profile patterns indicating the relationship between delay amounts between the generated delay profile and a reference broadcast wave prepared in advance and a broadcast wave transmitted from a predetermined transmitting station are stored A transmitting station specifying method comprising: a specifying step of comparing the delay profile pattern stored in the unit and specifying the transmitting station that has transmitted the received broadcast wave. A program of a transmitting station specifying device, wherein the program specifies the specifying device,
Receiving means for receiving broadcast waves transmitted from a predetermined transmitting station;
Reference broadcast wave generation for generating a reference broadcast wave by modulating a TS signal having the same content as the broadcast wave transmitted from the transmission station so as to be a broadcast wave having the same frequency as the broadcast wave from the transmission station Means,
Delay profile generating means for generating a delay profile based on the received broadcast wave received by the receiving means and the reference broadcast wave;
Delay profile pattern storage in which a plurality of delay profile patterns indicating the relationship between delay amounts between the generated delay profile and a reference broadcast wave prepared in advance and a broadcast wave transmitted from a predetermined transmitting station are stored Comparing with a delay profile pattern stored in the section, the program functions as a specifying means for specifying the transmitting station that has transmitted the received broadcast wave.

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