JP4932335B2 - Train broadcast receiving system - Google Patents

Description

  The present invention relates to a train broadcast receiving system that receives a broadcast radio signal from a television or the like in a train (such as a railway vehicle) traveling on a track.

  As a conventional train broadcast receiving system, there is a proposal of a method of switching a receiving station based on GPS position information (see, for example, Patent Document 1). In this train broadcast receiving system, when the train operates in an area where broadcast signals from a plurality of broadcasting stations of the same series can be received, the same program is continuously viewed, so the reception status is good during the operation. A broadcast station is selected and switched.

JP 2005-184219 A

  However, it is difficult to derive the appropriate switching timing of the broadcast signal to be received from the position of the local point and the reception sensitivity of the broadcast signal at the current position alone. Reception sensitivity must also be considered. In addition, although it is possible to predict the switching timing of the broadcast signal to be received from only the position of the local point and the reception sensitivity of the broadcast signal at the current position, it is complicated including the prediction of the position after the current time and the prediction of the reception sensitivity. There is a problem that it is necessary to perform a correct process.

  Then, this invention is made | formed in order to solve the subject of the said prior art, and it aims at providing the train broadcast receiving system which can receive a broadcast signal stably at the time of train operation.

The train broadcast receiving system of the present invention includes a position information acquisition means for acquiring position information indicating a one-dimensional position of a train traveling on a track on the track,
Receiving means for receiving one or more broadcast signals transmitted from a plurality of broadcast stations;
Information providing means for providing the user with information based on the broadcast signal received by the receiving means;
Broadcast station switching means for switching a broadcast signal that is a source of information provided by the information providing means to any one of the broadcast signals transmitted from the plurality of broadcast stations;
Database information that associates a one-dimensional position of a train on the track with a broadcasting station that transmits a broadcast signal that is a source of information provided by the information providing unit at the one-dimensional position is acquired. Database acquisition means,
Switching of the broadcast signal by the broadcast station switching unit is performed based on the location information acquired by the location information acquisition unit and the database information acquired by the database acquisition unit,
Each of the receiving means includes a plurality of tuners each receiving a broadcast signal transmitted from each of the plurality of broadcasting stations;
Switching by the broadcasting station switching means is performed by selectively transmitting any of the broadcast signals output from the plurality of tuners to the information providing means,
Acquisition of database information by the database acquisition means is acquisition of database information from an external database holding means that holds the database information including database information created by trains that have previously traveled on the same track ,
Broadcast station determining means for selecting one of the plurality of broadcast stations based on reception sensitivity of broadcast signals by the plurality of tuners;
A database registration unit that associates the location information acquired by the location information acquisition unit with the broadcast station selected by the broadcast station determination unit and holds the database information as the database information in the database holding unit. Features.

  According to the present invention, by selecting a broadcast signal from a broadcasting station based on database information constructed in advance, switching considering not only the local point but also reception sensitivity corresponding to a point passing after the local point Therefore, the receiving broadcast station can be switched appropriately without depending on the control of switching after the reception sensitivity becomes lower than a certain level, so that the effect that the broadcast signal can be stably received is obtained. Can do.

Embodiment 1 FIG.
FIG. 1 is a block diagram schematically showing a configuration of a train broadcast receiving system 101 according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a train broadcast receiving system 101 provided in a train 100 includes a train operation control unit 1 that performs control such as train operation based on information from a base station 201. The train operation control means 1 includes a transceiver (not shown) and performs, for example, wireless communication with the base station 201.

  Further, the train broadcast receiving system 101 includes position information acquisition means 2 for acquiring position information of the train 100 traveling on the track R from the train operation control means 1. The position detection of the train 100 may be performed using an existing method used for train operation control. Examples of the existing position detection method include a track circuit method, a method in which a detector is provided on either the ground or a train, and a GPS method. However, since the train 100 travels on a predetermined track R along a one-dimensional route, an expensive device such as GPS that detects a position two-dimensionally is not necessarily required.

  Further, the train broadcast receiving system 101 receives the information on the basis of the broadcast signal received by the reception means 3 and the reception means 3 that receives one or more of the broadcast signals transmitted from the plurality of broadcast stations 301 and 302. Information providing means 5 provided to the broadcasting station, and broadcast station switching means 4 for switching the broadcast signal that is the basis of the information provided by the information providing means 5 to one of the broadcast signals transmitted from the plurality of broadcasting stations 301 and 302; have.

  The receiving means 3 includes a plurality of tuners 3a and 3b that receive broadcast signals transmitted from the plurality of broadcasting stations 301 and 302, respectively. The receiving means 3 has an antenna (not shown) that receives broadcast signals and outputs them to the tuners 3a and 3b. FIG. 1 shows a case where the number of broadcasting stations 301 and 302 is two and the number of tuners 3a and 3b is two. However, the number of broadcasting stations and the number of tuners are three or more, respectively. There may be.

  Switching by the broadcasting station switching unit 4 is performed in order to selectively transmit any of the broadcast signals output from the plurality of tuners 3 a and 3 b to the information providing unit 5. The information providing means 5 includes a decoder 5a that decodes a broadcast signal, and a device (not shown) such as a display and a speaker that displays video and / or outputs audio based on the decoded broadcast signal. .

  Furthermore, the train broadcast receiving system 101 is provided by the database holding means 6 that is a storage device that holds database information, the position of the train 100 on the track R from the database holding means 6, and the information providing means 5 at this position. And database acquisition means 7 for acquiring database information in association with a broadcasting station that transmits a broadcast signal that is a source of information.

Further, the train broadcast receiving system 101 includes broadcast station determining means 8 for selecting one of the plurality of broadcast stations 301 and 302 based on the reception sensitivities S _3a and S _3b of the broadcast signals from the plurality of tuners 3a and 3b, A database registration unit 9 that associates the location information acquired by the location information acquisition unit 2 with the broadcast station selected by the broadcast station determination unit 8 and registers (or updates) the database in the database holding unit 6 as database information; Have. The broadcast station determination means 8 compares the broadcast signal reception sensitivities S _3a and S _3b to determine the broadcast station 301 or 302 that transmits a broadcast signal with high reception sensitivity.

  Switching of broadcast signals by the broadcast station switching means 4 (that is, switching of broadcast stations) is performed based on the position information acquired by the position information acquisition means 2 and the database information acquired by the database acquisition means 7.

  In the present application, the configuration described as “... Means” can be realized by hardware such as an electric circuit, software operating on a computer, or a combination of hardware and software.

  First, the switching operation of a broadcasting station that provides a broadcast signal that is the source of information provided from the information providing means 5 (that is, video display, audio output, etc.) will be described. FIG. 2 is a flowchart showing a broadcast station switching operation in the train broadcast receiving system 101 according to the first embodiment. FIG. 3 is a diagram showing a part of the database information acquired from the database holding means 6 by the database acquisition means 7 in the train broadcast receiving system according to the first embodiment. FIG. 4 is a diagram showing train positions P1 to P12 on the track R in the train broadcast receiving system 101 according to Embodiment 1, and the broadcast stations 301 or 302 selected at the respective train positions P1 to P12.

  As shown in FIG. 2, first, the position information acquisition means 6 acquires train position information from the train operation control means 1, and the broadcast station switching means 4 acquires train position information from the position information acquisition means 6 ( Step ST1). The train position information is, for example, any one of positions P1 to P12 on the track R shown in FIG.

  Next, the database acquisition means 7 acquires database information from the database holding means 6, and the broadcast station switching means 4 acquires database information from the database acquisition means 7 (step ST2). For example, as shown in FIG. 3, the database information includes positions P1 to P12 (the left column in FIG. 3) on the track R of the train and the broadcasting station 301 or 302 to be selected at each position (the right column in FIG. 3). ).

  Next, the broadcast station switching means 4 determines the broadcast station 301 or 302 to be selected based on the train position information acquired from the position information acquisition means 6 and the database information acquired from the database acquisition means 7. (Step ST3).

  Next, the broadcast station switching means 4 determines whether or not the currently selected broadcast station and the broadcast station to be selected obtained in step ST3 are the same (step ST4). If the currently selected broadcast station is the same as the broadcast station to be selected obtained in step ST3, the processing of the broadcast station switching means 4 returns to step ST1. When the currently selected broadcast station is different from the broadcast station to be selected obtained in step ST3, the broadcast station switching means 4 transmits a broadcast signal that is the basis of the information provided to the information providing means 5. Broadcast station switching operation is performed, and then the process returns to step ST1.

  Next, an update registration operation for database information will be described. FIG. 5 is a flowchart showing a database construction operation in the train broadcast receiving system according to the first embodiment. FIG. 6 is a diagram showing train positions P1 to P12 in the train broadcast receiving system according to Embodiment 1 and reception sensitivity at each position. FIG. 7 is a diagram showing a part of database information constructed and registered in the train broadcast receiving system according to the first embodiment.

  As shown in FIG. 5, first, the position information acquisition means 6 acquires train position information from the train operation control means 1, and the database registration means 9 acquires train position information from the position information acquisition means 6 (step ST11). The train position information is, for example, any one of positions P1 to P12 on the track R shown in FIG.

Then, the broadcast station determining means 8 acquires the reception sensitivities S _3a and S _3b of the plurality of tuners 3a and 3b at this time (step ST12). That is, the broadcasting station determination unit 8 acquires the reception sensitivity S _3b by the tuner 3b of the broadcast signal from the broadcast station 302 and the receiving sensitivity S _3a by tuners 3a of the broadcast signal from the broadcast station 301, in comparison, reception sensitivity Determine a high broadcasting station. The reception sensitivities S _3a and S _3b and their magnitude relation are shown in FIG. 6, for example.

  Next, the database registration unit 9 uses each position P1 to P12 on the track based on the train position information acquired by the position information acquisition unit 6 and the broadcast station information determined from the broadcast station determination unit 8. The broadcasting station 301 or 302 corresponding to is determined (step ST13).

  Next, the database registration unit 9 registers the database information in the database holding unit 6 (step ST14), and returns the process to step ST11. For example, as shown in FIG. 7, the registered database information includes positions P1 to P12 (the left column in FIG. 7) on the track R of the train, and broadcast stations 301 or 302 (FIG. 7) selected at each position. To the right column).

  In the train broadcast receiving system 101 configured as described above, it is possible to always perform optimum reception control using the characteristics of trains that repeatedly operate on the same route. In other words, information based on the train position information ahead of the actual traveling point can be acquired in advance based on the database built up to the previous traveling, so the reception sensitivity is lowered and reception is not possible. Before becoming stable, another broadcasting station capable of more stable reception can be selected. By such control, it is possible to avoid as much as possible the block noise display that occurs when the reception sensitivity is lowered.

  In addition, in a section in which none of the tuners 3a and 3b of the receiving means 3 can receive the broadcast signal, the conventional train broadcast receiving system suddenly becomes a black screen. Although the situation that worsens has occurred, the train broadcast receiving system 101 according to the first embodiment can know in advance the sections that cannot be received, so that the screen is gradually darkened or the broadcast reception screen is interrupted in advance. It is possible to display a message that informs the user and to perform detailed display control considering the user.

  Moreover, according to the train broadcast receiving system 101 according to the first embodiment, the database is kept up-to-date according to the reception situation, so that the situation where the database becomes obsolete and loses its utility value can be avoided. For example, according to the train broadcast receiving system 101 according to the first embodiment, the reception status is changed when the transmission intensity from the broadcast station is changed, broadcasting is newly started, or a high building is built. Even if changes, the database reflecting the latest situation can be constructed.

  In addition, according to the train broadcast receiving system 101 according to the first embodiment, it is possible to easily identify a broadcasting station corresponding to a position on a one-dimensional track based on database information constructed in advance, and only at a local point. In addition, since it is possible to know a broadcasting station corresponding to a later passing point, it is not necessary to specially install a general-purpose GPS position information acquisition device or the like for acquiring two-dimensional position information.

  In addition, since there is no database information in the first operation on the same route, the control of the first embodiment cannot be performed, but the control of the first embodiment can be performed from the second operation. In the first operation, switching with the reception sensitivity similar to that of the conventional train broadcast reception system may be performed.

  In the above description, the case where the receiving broadcast station is selected and received according to the database information has been described. However, the reception sensitivity of any broadcast signal received is low, and it is determined that video and audio cannot be normally displayed and output. May be operated to stop video display and audio output.

Embodiment 2. FIG.
FIG. 8 is a block diagram schematically showing the configuration of the train broadcast receiving system 102 according to Embodiment 2 of the present invention. In FIG. 8, the same or corresponding components as those in FIG.

  In the second embodiment, unlike the first embodiment, the database holding means 202 indicating the relationship between the train position information and the selected broadcast station is not provided in the train. For example, the base station or the operation monitoring center ( (Not shown). Communication between the database holding unit 202 and the train is performed by wireless communication. For example, wireless communication by the train operation control unit 1 may be used.

  As described above, according to the train broadcast receiving system 102 according to the second embodiment, if the train runs on the same route, the database information of the train that has traveled before can be used, which is more effective. Operation becomes possible. In addition, there is an advantage that only the first train on one line needs to perform the switching operation with the reception sensitivity similar to the conventional train broadcast reception system. When the first train is operated as a test train, all trains that are normally operated can obtain the effects of the train broadcast receiving system of the present invention.

  Further, according to the train broadcast receiving system 102 according to the second embodiment, the database information by a plurality of trains operating on the same route can be comprehensively judged and the database can be reconfigured, so that the train-specific reception A difference in sensitivity can be absorbed and a more reliable database can be constructed.

  In the second embodiment, points other than those described above are the same as those in the first embodiment.

Embodiment 3 FIG.
FIG. 9 is a block diagram schematically showing the configuration of the train broadcast receiving system 103 according to Embodiment 3 of the present invention. 9, the same reference numerals are given to the same or corresponding components as those in FIG.

  Unlike the first embodiment, the train broadcast receiving system 103 according to the third embodiment does not include the broadcast station determination unit 8 and the database registration unit 9. Therefore, in the train broadcast receiving system 103 according to the third embodiment, the database information including the train position information and the corresponding received broadcast station information is constructed in advance using the train broadcast receiving system according to the first or second embodiment. It is constructed and installed by the same method as that.

  In the train broadcast receiving system 103 according to the third embodiment, unlike the first embodiment, the receiving means 11 includes one tuner 11a, and the broadcast station switching means 10 includes a plurality of broadcast stations 301 and 302. Is selected and a broadcast signal is output to the tuner 11a. However, the tuner and broadcast station switching means of the train broadcast receiving system 103 according to the third embodiment can be configured in the same manner as in the first embodiment.

  In the train broadcast receiving system according to the third embodiment, as in the first embodiment, the broadcast station switching means 10 appropriately uses the train position information and the database information including the received broadcast station information corresponding thereto. Perform the switching operation. Note that the database information is pre-installed using the train broadcast receiving system of the first or second embodiment.

  In the train broadcast receiving system according to the third embodiment, a device such as the broadcast station determining means 8 is not required, so that in addition to the same effects as those in the first embodiment, the device can be configured at low cost. Can do. In particular, in the train broadcast receiving system according to the third embodiment, it is not necessary to constantly monitor the reception sensitivities of a plurality of broadcast stations, so that the load applied to the system can be reduced and a highly durable operation is possible.

  In the third embodiment, points other than those described above are the same as those in the first embodiment.

Embodiment 4 FIG.
FIG. 10 is a block diagram schematically showing the configuration of the train broadcast receiving system 104 according to the fourth embodiment. 10, the same reference numerals are given to the same or corresponding components as those in FIG.

  In the fourth embodiment, unlike the third embodiment, the database holding means 202 indicating the relationship between the train position information and the reception target broadcast station is not provided in the train. For example, the base station or the operation monitoring center (see FIG. (Not shown). The communication between the database holding unit 202 and the train may be wireless communication, for example, wireless communication by the train operation control unit 1 or the like.

  In the train broadcast receiving system 104 of the fourth embodiment, if the train runs on the same route, the database information of the train that has run before that can be used, and more effective operation can be performed. The switching operation with the reception sensitivity similar to that of the conventional train broadcast reception system is advantageous in that only the first train on one line is required. In addition, the first train may be operated as a test train, and at this time, all trains in normal operation can obtain the effects of the train broadcast receiving system of the present invention.

  In addition, in the train broadcast receiving system 104 of the fourth embodiment, in addition to the effects of the third and second embodiments, the system price of the entire train operation can be reduced. it can. That is, among trains that operate on the same route, the train broadcast receiving system according to the second embodiment in which only the test train is constructed and the train broadcast receiving system according to the fourth embodiment having a low-cost configuration are mounted on the trains that are normally operated. In general, trains are overwhelmingly larger in quantity, and the overall system price can be reduced accordingly.

  In the fourth embodiment, points other than those described above are the same as in the third embodiment.

It is a block diagram which shows roughly the structure of the train broadcast receiving system which concerns on Embodiment 1 of this invention. 4 is a flowchart showing a broadcast station switching operation in the train broadcast receiving system according to the first embodiment. It is a figure which shows a part of database information acquired in the train broadcast receiving system which concerns on Embodiment 1. FIG. It is a figure which shows the train position and the broadcasting station which should be selected in the train broadcast receiving system which concerns on Embodiment 1. FIG. 4 is a flowchart showing a database registration operation in the train broadcast receiving system according to the first embodiment. It is a figure which shows the train position and receiving sensitivity in the train broadcast receiving system which concerns on Embodiment 1. FIG. It is a figure which shows a part of database database information registered in the train broadcast receiving system which concerns on Embodiment 1. FIG. It is a block diagram which shows roughly the structure of the train broadcast receiving system which concerns on Embodiment 2 of this invention. It is a block diagram which shows roughly the structure of the train broadcast receiving system which concerns on Embodiment 3 of this invention. It is a block diagram which shows roughly the structure of the train broadcast receiving system which concerns on Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Train operation control means, 2 Position information acquisition means, 3,11 Reception means, 3a, 3b, 11a Tuner, 4,10 Broadcast station switching means, 5 Information provision means, 5a Decoder, 6 Database holding means, 7 Database acquisition means 8 broadcast station determination means, 9 database registration means, 100 train, 101,..., 104 train broadcast reception system, 201 base station, 202 database holding means, 301, 302 broadcast station.

Claims (3)

Position information acquisition means for acquiring position information indicating a one-dimensional position of the train traveling on the track on the track;
Receiving means for receiving one or more broadcast signals transmitted from a plurality of broadcast stations;
Information providing means for providing the user with information based on the broadcast signal received by the receiving means;
Broadcast station switching means for switching a broadcast signal that is a source of information provided by the information providing means to any one of the broadcast signals transmitted from the plurality of broadcast stations;
Database information that associates a one-dimensional position of a train on the track with a broadcasting station that transmits a broadcast signal that is a source of information provided by the information providing unit at the one-dimensional position is acquired. Database acquisition means,
Switching of the broadcast signal by the broadcast station switching unit is performed based on the location information acquired by the location information acquisition unit and the database information acquired by the database acquisition unit,
Each of the receiving means includes a plurality of tuners each receiving a broadcast signal transmitted from each of the plurality of broadcasting stations;
Switching by the broadcasting station switching means is performed by selectively transmitting any of the broadcast signals output from the plurality of tuners to the information providing means,
Acquisition of database information by the database acquisition means is acquisition of database information from an external database holding means that holds the database information including database information created by trains that have previously traveled on the same track ,
Broadcast station determining means for selecting one of the plurality of broadcast stations based on reception sensitivity of broadcast signals by the plurality of tuners;
A database registration unit that associates the location information acquired by the location information acquisition unit with the broadcast station selected by the broadcast station determination unit and holds the database information as the database information in the database holding unit. A train broadcast receiving system that is characterized. It has train operation control means to communicate with the base station,
The train broadcast receiving system according to claim 1 , wherein the location information acquired by the location information acquisition unit is information received by the train operation control unit from the base station. Position information acquisition means for acquiring position information indicating a one-dimensional position of the train traveling on the track on the track;
Receiving means for receiving one or more broadcast signals transmitted from a plurality of broadcast stations;
Information providing means for providing the user with information based on the broadcast signal received by the receiving means;
Broadcast station switching means for switching a broadcast signal that is a source of information provided by the information providing means to any one of the broadcast signals transmitted from the plurality of broadcast stations;
Database information that associates a one-dimensional position of a train on the track with a broadcasting station that transmits a broadcast signal that is a source of information provided by the information providing unit at the one-dimensional position is acquired. Database acquisition means;
Train operation control means for communicating with the base station,
Acquisition of database information by the database acquisition means is acquisition of database information from an external database holding means that holds the database information including database information created by trains that have previously traveled on the same track,
Switching of the broadcast signal by the broadcast station switching unit is performed based on the location information acquired by the location information acquisition unit and the database information acquired by the database acquisition unit,
The train broadcast receiving system, wherein the location information acquired by the location information acquisition unit is information received from the base station by the train operation control unit.

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