JP2012191348A - Digital broadcast transmission/reception system, digital broadcast receiver, and digital broadcast transmission/reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast transmission/reception system capable of easily and automatically selecting a viewable broadcast station.SOLUTION: A broadcast reception part 11 receives a broadcast station list included in a digital broadcast. A broadcast station information list processing part 34 updates a broadcast station information list for mobile body road guide system where information on a broadcast station list is included in point information to be used in a mobile body road guide system, based on the broadcast station list acquired by the broadcast reception part 11. A present position information acquisition part 12 acquires present position information. A distance calculation part 32 calculates distances from a present position to each broadcast station respectively, based on broadcast station position information included in the broadcast station information list for mobile body road guide system and the present position information acquired by the present position information acquisition part 12. An automatic station selection processing part 35 selects the channel of a broadcast station in order from a broadcast station closer in distances from the present position to the respective broadcast stations, which are calculated by the distance calculation part 32.

Description

  The present invention relates to a digital broadcast transmission / reception system, a digital broadcast reception apparatus, and a digital broadcast transmission / reception method that make it easy to select a broadcast station that can be viewed.

  In digital terrestrial broadcasting operated in Japan, in addition to normal wideband broadcasting, narrowband broadcasting mainly intended for portable receiving terminals called one-segment broadcasting (one-segment local service) is also broadcast. In general, one-segment broadcasting is simulcast at the same broadcasting frequency as broadband broadcasting. A demonstration test is currently being conducted to limit the broadcasting area of this one-segment broadcasting to a very narrow range and use it for broadcasting content other than broadband broadcasting. This one-segment broadcasting in which the broadcasting area is limited to a very narrow range is hereinafter referred to as “area one-segment broadcasting”.

  Area one-segment broadcasting is operated with extremely small transmission power called weak power or low power. Broadcasting with weak power has a receivable area of, for example, a radius of about 3 m, and broadcasting with low power has a receivable area of, for example, a radius of about 100 m. In Area One Seg broadcasting, for example, limited information in a receivable area (broadcast target area) such as the vicinity of a store or an event venue is in the receivable area by contents such as video, audio, or data broadcasting. It can be accurately provided only to users. Area one-segment broadcasting stations are frequently opened, closed, changed, etc., depending on the region and time.

  In a receiving apparatus such as a television or radio, as a function for facilitating channel selection, for example, a preset function for storing a plurality of buttons for input and the frequency of a broadcasting station frequently viewed is stored in association with each other. It has been. Patent Document 1 proposes that when a region symbol such as a telephone area code is input, a tuner automatically presets frequency data (broadcasting station) groups corresponding to the region.

  On the other hand, in terrestrial digital broadcasting, using a signal called SDTT (Software Download Trigger Table) that is sent superimposed on the digital broadcast, the start of the operation of a new broadcast station or a change in the frequency of an existing broadcast station is sent to the receiving device. Can be notified (see Non-Patent Document 1).

Japanese Patent Laid-Open No. 5-206784

Digital Terrestrial Television Broadcasting Operation Regulations Technical Data ARIB TR-B14 4.3 Edition The Radio Industry Association

  When presetting a broadcast station for area one seg broadcasting that can be viewed, the method of Patent Document 1 uses a non-rewritable table in which regional symbols and broadcast stations are associated with each other. It can not cope with things that change frequently due to etc. It is possible to search and preset broadcast stations that can be received by scanning the frequencies of all broadcast stations. However, there are problems that it takes time to scan, and that it is necessary to scan every time the user moves.

  It is conceivable to obtain the frequency of a broadcast station that can be viewed from the information of the area one-segment broadcasting station acquired from the outside. When obtaining information of a new broadcast station by SDTT such as frequency list / change information described in Non-Patent Document 1, the receivable area is very narrow, and detailed location information of the broadcast station is not included in the SDTT. It is difficult to determine whether the area one-segment broadcasting can be received at the position of the receiving device.

  In view of the above problems, an object of the present invention is to provide a digital broadcast transmission / reception system, a digital broadcast reception apparatus, and a digital broadcast transmission / reception method capable of easily and automatically selecting a broadcast station that can be viewed.

  In order to achieve the above object, according to a first aspect of the present invention, a broadcasting station list (51) including broadcasting station position information indicating the position of each broadcasting station and channel information of each broadcasting station is provided for digital broadcasting. A digital broadcast transmission device (5) including a transmission unit (52) for broadcasting including the broadcast reception unit (11) for receiving the digital broadcast and acquiring the broadcast station list included in the digital broadcast; A storage unit (4) for storing a mobile station guidance system broadcast station information list (43) including the information of the broadcast station list in the spot information used in the body road guidance system is stored in the storage unit (4). In addition, the broadcasting station information list processing unit (34) that updates the mobile station guidance system broadcasting station information list based on the broadcasting station list acquired by the broadcasting receiving unit (11), acquires current position information. Current location information acquisition unit (12), the broadcast station location information included in the mobile road guide system broadcast station information list (43) stored in the storage unit (4) and the current location information acquisition unit ( The distance calculation unit (32) that calculates the distance from the current position to each broadcasting station from the current position information acquired by 12), and each broadcasting station from the current position calculated by the distance calculation unit (32) The gist of the present invention is a digital broadcast transmission / reception system including a digital broadcast receiving device (1) including an automatic channel selection processing unit (35) for selecting a channel of the broadcast station in order from a broadcasting station having a short distance to .

  The second aspect of the present invention receives a digital broadcast broadcast including a broadcast station list (51) including broadcast station position information indicating the position of each broadcast station and channel information of each broadcast station, A broadcast receiving unit (11) for acquiring the broadcast station list, and a mobile road guidance system broadcast station information list (43) including information on the broadcast station list in point information used in the mobile road guidance system. The storage station (4) for storing, and the broadcast station list acquired by the broadcast receiving section (11) for the mobile road guidance system broadcast station information list (43) stored in the storage section (4) Broadcast station information list processing unit (34) for updating based on the current location information acquisition unit (12) for acquiring current location information, and broadcasting for the mobile road guidance system stored in the storage unit (4) Station information list ( 3) a distance calculation unit (32) that calculates a distance from the current position to each broadcast station from the broadcast station position information included in 3) and the current position information acquired by the current position information acquisition unit (12); And an automatic channel selection processing unit (35) for selecting a channel of the broadcasting station in order from a broadcasting station having a short distance from the current position calculated by the distance calculation unit (32) to each broadcasting station. The gist of the present invention is that it is a digital broadcast receiving device (1).

According to a third aspect of the present invention, the digital broadcast transmission device (5) generates a broadcast station list (51) including broadcast station position information indicating the position of each broadcast station and channel information of each broadcast station. A transmission step for broadcasting in a digital broadcast receiving device (1) for receiving the digital broadcast and obtaining the broadcast station list included in the digital broadcast;
A broadcasting station information list processing step of updating a broadcasting station information list for a moving body road guidance system including information on the broadcasting station list in point information used in the moving body road guidance system based on the acquired broadcasting station list; A current position information acquisition step for acquiring current position information, the broadcast station position information included in the mobile station guidance system broadcast station information list, and the current position information acquired in the current position information acquisition step, The distance calculation step for calculating the distance from the current position to each broadcasting station, and the channel of the broadcasting station are selected in order from the broadcasting station closest to the distance from the current position calculated in the distance calculation step to each broadcasting station. And a digital broadcast transmission / reception method comprising: an automatic channel selection processing step.

  According to the present invention, it is possible to easily and automatically select a broadcast station that can be viewed.

1 is a schematic block diagram illustrating a basic configuration of a digital broadcast system according to a first embodiment of the present invention. 5 is a flowchart for explaining a preset method of the digital broadcast receiving device in the digital broadcast system according to the first embodiment of the present invention. In the digital broadcast system according to the first embodiment of the present invention, it is an example of a data format of a broadcast station list transmitted by a specific broadcast station. It is an example of the data structure of an extension element among the data formats shown in FIG. It is an example which illustrated the broadcast station list used for the digital broadcasting system concerning a 1st embodiment of the present invention. It is a figure explaining the preset method of a digital broadcasting receiver in the digital broadcasting system concerning a 1st embodiment of the present invention. It is a figure explaining the preset information of a digital broadcasting receiver in the digital broadcasting system concerning a 1st embodiment of the present invention. It is an example which illustrated the digital broadcast receiver in the digital broadcast system which concerns on the application example of the 1st Embodiment of this invention. In the digital broadcast system according to the second embodiment of the present invention, it is an example of the data format of the broadcast station information list of the digital broadcast receiver. It is a flowchart explaining the broadcasting station information list update method of a digital broadcasting receiver in the digital broadcasting system which concerns on the 2nd Embodiment of this invention. (A)-(f) is an example of the data structure of an extension element among the data formats shown in FIG. It is an example of the classification code of the data format shown in FIG. It is a flowchart explaining the automatic channel selection method of a digital broadcast receiver in the digital broadcast system which concerns on the 2nd Embodiment of this invention.

  Next, first and second embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the first and second embodiments described below exemplify apparatuses and methods for embodying the technical idea of the present invention, and programs used in these apparatuses. The technical idea is not limited to the devices and methods exemplified in the following embodiments and the programs used for these devices. The technical idea of the present invention can be variously modified within the technical scope described in the claims.

(First embodiment)
As shown in FIG. 1, the digital broadcasting system according to the first embodiment of the present invention includes channel information indicating the physical channel (frequency) of each broadcasting station and broadcasting station position information indicating the position of each broadcasting station. The broadcast station list 51 including the broadcast station list 51 includes a specific broadcast station 5 that broadcasts the digital broadcast, and the digital broadcast receiver 1 that receives digital broadcasts of various broadcast stations including the specific broadcast station 5.

  The digital broadcast receiving apparatus 1 acquires current position information indicating a current position based on a broadcast receiving unit 11 that receives broadcasts from each broadcast station and a signal transmitted from a GPS (Global Positioning System) satellite. A position information acquisition unit 12, an audio output unit 15, an operation input unit 21, a display unit 22, and a processing unit 3 that processes various calculations performed by the digital broadcast receiving device 1 and controls the digital broadcast receiving device 1; And a storage unit 4 for storing various data, programs, and the like. The digital broadcast receiver 1 is a portable receiver that receives a digital broadcast from each broadcast station. For example, the digital broadcast receiver 1 is installed in a vehicle (not shown) and is integrated with a car navigation system, a car audio, a video device, and the like. Can be done.

  The broadcast receiving unit 11 includes a broadcast antenna 111 that receives a signal broadcast from each broadcasting station, and a tuner unit 112 that is tuned to each frequency of the signal received by the broadcast antenna 111 under the control of the processing unit 3. Prepare. In addition to being transmitted via digital broadcasting, the broadcast station list 51 includes DSRC (Dedicated Short Range Communication) used for communication between devices installed on the roadside and vehicles, wireless Internet communication, mobile phone lines, and the like. It may be transmitted to the digital broadcast receiving apparatus 1 via.

  The tuner unit 112 measures the radio wave intensity and C / N ratio of a set broadcast wave having a predetermined frequency and detects whether it can be received, the segment structure of the received broadcast wave, the modulation method and code for each segment, etc. It has a function of reading TMCC (Transmission and Multiplexing Configuration Control) information indicating transmission parameters such as the conversion rate.

  The tuner unit 112 may be capable of receiving only one-segment broadcast waves among digital broadcast waves, or can receive both wide-band broadcast (also referred to as full-segment broadcast or 12-segment broadcast) and one-segment broadcast waves. It may be a thing.

  The current position information acquisition unit 12 is, for example, a GPS antenna 121 that receives a signal transmitted from a GPS satellite, and a current position that indicates the current position of the digital broadcast receiving device 1 based on the signal received by the GPS antenna 121. A current position information calculation unit 122 that calculates information; The method for acquiring the current position information is not limited to GPS, and the current position information may be acquired by another method.

  The audio output unit 15 decodes the digital broadcast audio data received by the broadcast receiving unit 11 and outputs audio from an output device such as a speaker.

  The operation input unit 21 includes operation input devices such as various switches, and outputs different signals to the processing unit 3 according to user operations. The display unit 22 includes a display device such as an LCD (Liquid Crystal Display). The operation input unit 21 and the display unit 22 may employ the touch panel 2 as a configuration in which an operation input device and a display device are applied. The operation input unit 21 may include a push button (see FIGS. 8, 210, and 211) in addition to the touch panel 2.

  The storage unit 4 can store a series of programs necessary for processing performed by the digital broadcast receiving apparatus 1 and can be used as a temporary storage area necessary for processing such as SDTT. The storage unit 4 includes, for example, a main storage device including a volatile storage device such as SRAM and DRAM, and a nonvolatile storage device such as a magnetic disk such as a hard disk (HD), a magnetic tape, an optical disk, and a magneto-optical disk. An auxiliary storage device. In addition, as the auxiliary storage device, a RAM disk, an IC card, a flash memory card, a USB flash memory, a flash disk (SSD), or the like can be used.

  The processing unit 3 has a broadcasting station list processing unit 31, a distance calculation unit 32, a preset processing unit 33, a broadcasting station information list processing unit 34, and an automatic channel selection processing unit 35 as a logical structure. Each element constituting the processing unit 3 and the storage unit 4 illustrated in FIG. 1 is a display as a logical structure, and may be configured by separate hardware.

  The specific broadcasting station 5 includes a transmitting unit 52 that includes a broadcasting station list 51 including broadcasting station position information indicating the position of each broadcasting station that performs digital broadcasting such as area one-segment broadcasting, and broadcasts the broadcasting station list 51. It is. The specific broadcasting station 5 may be a broadcasting station that performs normal broadband digital broadcasting (also referred to as full-segment broadcasting or 12-segment broadcasting) that is not a one-segment broadcasting station.

-Preset-
A method for presetting a viewable broadcast station in the digital broadcast receiving apparatus 1 according to the first embodiment will be described with reference to the flowchart of FIG.

  First, in step S101, the current position information acquisition unit 12 acquires the current position information of the digital broadcast receiving device 1 calculated by the current position information calculation unit 122 based on the signal received by the GPS antenna 121. For example, the current position information is north latitude 35 degrees 41 minutes 26.89 seconds (hereinafter, latitude is described in a format of 35 ° 41 ′ 26.89 N), east longitude 139 degrees 42 minutes 36.22 degrees (hereinafter, longitude is 139). ° 42 '26.22E).

  In step S102, the broadcast station list processing unit 31 of the processing unit 3 causes the tuner unit 112 to tune to the frequency of the specific broadcast station 5 that broadcasts the signal including the broadcast station list 51, and causes the specific broadcast station 5 to select a channel.

  In step S103, the broadcast station list processing unit 31 acquires the broadcast station list 51 obtained by the broadcast by the specific broadcast station 5 and received by the broadcast reception unit 11 from the broadcast reception unit 11, and stores it in the storage unit 4. It is stored as a broadcast station list 41.

  In the first embodiment of the present invention, the data format describing the broadcast station list 51 broadcasted by the specific broadcast station 5 is, for example, as shown in FIG. It is described in an extended format of "list / change information syntax". Among the terms of the data structure shown in FIG. 3, four terms “new_location_latitude”, “new_location_longitude”, “location_latitude”, and “location_longitude” shown in italics are newly added terms.

  “New_location_latitude” indicates the latitude of a broadcasting station that has started operating after a change in specifications of the broadcasting station such as frequency and output. “New_location_longitude” indicates the longitude of a broadcasting station that has started operating after the specification is changed. “Location_latitude” indicates the latitude of a broadcasting station with no specification change. “Location_longitude” indicates the longitude of a broadcasting station with no specification change. The term “32” of the number of bits in FIG. 3 indicates that the data width is 32 bits, and the bit string notation “simsbf” indicates that the most significant bit is the head and is a signed integer.

  As shown in FIG. 4, the data of the “new_location_latitude” and “location_latitude” data indicating the latitude of the broadcasting station is set to 0 when the latitude of the broadcasting station is north latitude, and the 32nd from the upper 9 bits. The bit is described with the integer part of the value obtained by converting latitude into degrees and multiplying it by 100,000. When the latitude of the broadcasting station is south latitude, the upper 8 bits are set to 1, and the upper 9 bits to the 32nd bit are converted into degrees in latitude, and the two's complement of the integer part of the value multiplied by 100,000 is described. The For example, if the latitude 35 ° 41 ′ 26.89N of the broadcasting station after the specification change or newly started operation is taken as the unit of degrees, it becomes 35.690080278 °. If it is multiplied by 100,000, it will be 3569080.278, and if it is rounded off after the decimal point, it will be 3569080. When this is converted into hexadecimal notation (Hex value), it becomes 0x00367568. Since the north latitude is expressed as positive and the south latitude is expressed as negative, in the case of 35 ° 41 '26.89N, "new_location_latitude" is 0x00367568.

  As shown in FIG. 4, the data in the “new_location_longitude” and “location_longitude” data indicating the longitude of the broadcasting station is set to 0 when the longitude of the broadcasting station is east longitude, with the upper 7 bits starting from 32. The bit is described with the integer part of the value obtained by converting longitude into degrees and multiplying by 100,000. When the longitude of the broadcast station is formed, all the upper 7 bits are set to 1, and the upper 8 bits to the 32nd bit are converted into longitude units in degrees, and the two's complement of the integer part of the value multiplied by 100,000 is described. The For example, if the longitude of the broadcasting station after the specification change or newly started operation is 139 ° 42 ′ 26.22E, the unit is 139.7072833 °. If it is 100,000 times, it will be 13970728.33, and if it is rounded off after the decimal point, it will be 13970728. When this is converted into hexadecimal notation (Hex value), 0xd52d28 is obtained. Since east longitude is expressed as positive and west longitude is expressed as negative, in the case of 139 ° 42 ′ 26.22E, “new_location_longitude” is 0x00d52d28.

  For example, as shown in FIG. 5, the broadcast station list 41 includes the physical channel of each broadcast station and the latitude and longitude of each broadcast station as broadcast station position information indicating the position of each broadcast station. In addition, the broadcast station list 41 can include various parameters like the data format shown in FIG.

  In step S104, the distance calculation unit 32 sets a pointer to one broadcast station among the broadcast stations described in the broadcast station list 41 stored in the storage unit 4 in step S103.

  In step S105, the distance calculation unit 32 determines the current position from the broadcast station position information in the broadcast station list 41 and the current position information acquired by the current position information acquisition unit 12 in step S101 for the broadcast station to which the pointer is set. Calculate the distance from the station to the broadcasting station. For example, in the case where the current position of the digital broadcast receiving apparatus 1 is 35 ° 41 ′ 26.89E, 139 ° 42 ′ 26.22E, and the positions of the broadcast stations are 35 ° 41 ′ 21.71E, 139 ° 42 ′ 27.91E, The distance is 244.8 m. The distance calculated by the distance calculation unit 32 is added to each broadcast station column of the broadcast station list 41 in step S106.

  In step S107, the distance calculation unit 32 determines whether or not the broadcasting station whose distance has been calculated in the immediately preceding step S106 is the last broadcasting station in the broadcasting station list 41. If it is determined that the station is the final broadcasting station, the pointer is released and the process proceeds to step S109. If it is not determined to be the final broadcasting station, the process proceeds to step S108, a pointer is set to the next broadcasting station in the broadcasting station list 41 for which the distance has not yet been calculated, and the process returns to step S105.

  In step S109, the preset processing unit 33 sorts the broadcast station list 41 to which the distances to the respective broadcast stations are added, in the order of broadcast stations having the shortest distance, as shown in FIG.

  In step S110, the preset processing unit 33 sets one of the preset numbers. For example, assuming that preset numbers “1” to “5” (see FIGS. 7 and 8) are prepared, the smallest number among preset numbers that have not yet been preset may be set.

  In step S111, for example, the preset processing unit 33 sets a pointer to the nearest broadcast station in the broadcast station list 41 sorted in order of the nearest broadcast stations. In step S112, the preset processing unit 33 determines whether or not the distance from the broadcast station list 41 to the broadcast station to which the pointer is set is smaller than a predetermined threshold value. If it is determined that the threshold value is smaller than the predetermined threshold value, the process proceeds to step S113, where the preset number set and the physical channel of the broadcasting station to which the pointer is set are associated with each other as preset information 42 as shown in FIG. Preset by storing in the storage unit 4. When it determines with more than a predetermined threshold value in step S112, it complete | finishes. For example, if the threshold is 150 m, in FIG. 6, 35ch and 29ch broadcasting stations are not preset as in the preset information shown in FIG.

  In step S114, the preset processing unit 33 determines whether or not the broadcasting station preset in the immediately preceding step S113 is the last broadcasting station in the broadcasting station list 41. If it is determined that the station is the final broadcasting station, the pointer is released and the process ends. If it is not determined to be the final broadcasting station, the process proceeds to step S115, and it is determined whether or not the preset number preset in the immediately preceding step S113 is the final preset number among the preset numbers to be prepared. If the final preset number is determined, the process ends. If it is not determined to be the final preset number, the process proceeds to step S116, the next preset number not yet preset is set, and in step S117, a pointer is set to the next broadcast station in the broadcast station list 41 not yet preset, and step S112 is set. Return to.

  In the above example, the preset numbers are associated with the physical channels of each broadcasting station in ascending order (ascending order). However, depending on the usage status of the user, the preset numbers may be associated in descending order (descending order) or other rules. It does not matter if they are related.

  As described above, when the preset process is completed, the user presses the preset buttons 211a to 211d corresponding to the preset numbers “1” to “4” illustrated in FIG. 42, the tuner unit 112 can select a physical channel (frequency) corresponding to the preset number.

  According to the digital broadcast receiving apparatus 1, since the broadcast station list includes the broadcast station position information of each broadcast station, the distance from the broadcast station list to each broadcast station can be calculated. Therefore, by performing the preset process based on the distance to each broadcasting station, it is possible to reliably select a broadcasting station that can be viewed in an area one segment having a narrow broadcasting area.

-Application example-
By applying the digital broadcast receiver 1 used in the digital broadcast system according to the first embodiment of the present invention to an existing navigation system, as shown in FIG. 8, the preset number of the preset information 42 and each broadcast The station can be displayed on the touch panel 2.

  Since the position information of each broadcasting station in the preset information 42 stored in the storage unit 4 is known, each broadcasting station in the preset information 42 can be displayed on the display unit 22 together with a map in the car navigation system. Furthermore, it is possible to display the vehicle position on the map like the icon 223 from the current position information. By displaying the transmitting station, its preset number, and the vehicle position on the touch panel 2, the user can identify the transmitting station of which area, for example, the transmitting station of the amusement park or the transmitting center of the shopping center. It can be confirmed on the map along with the preset number.

  In addition, by operating the area 221 and preset number area 222 of each broadcasting station displayed on the touch panel 2, it is possible to select a broadcasting station corresponding to the operated area. As a result, it is possible to more easily select a broadcast station that can be viewed, or to easily select a broadcast of a broadcast station in the traveling direction.

(Second Embodiment)
The digital broadcast receiver 1 according to the second embodiment of the present invention uses the broadcast station list described in the first embodiment and point information of a mobile road guidance system represented by a car navigation system. Channel selection can be performed automatically using the applied broadcast station information list. In the second embodiment, the description of the same configuration as that of the first embodiment is omitted.

  The mobile road guidance system broadcast station information list 43 described in the second embodiment is stored in advance in the storage unit 4 as a part of the mobile road guidance system database. For example, as shown in FIG. 9, the mobile road guidance system broadcast station information list 43 includes a KIWI format (JISD0810 “Car navigation system map data storage format”), which is one of formats used for a car navigation system database. (Refer to), and is described in an extended format of POI (Point Of Interest) information which is point information for searching for facilities around the vehicle. The mobile road guidance system broadcast station information list 43 has one broadcast station information as shown in FIG. 9 for one broadcast station.

  For example, in the item number “1” and the usage “RLXY”, the longitude and latitude coordinates of the broadcasting station are described as the broadcasting station position information. The type code of the item number “14” describes the type code of the facility where the broadcasting station exists. For example, as shown in FIG. 12, the type code is described as 0x4080 when the broadcasting station exists at the gas station. A plurality of type codes are assigned to the type codes so that affiliated stores can be identified. In the incidental facility / type code of item number “15”, a type code indicating a broadcasting station is described. For example, 0x0405 used to represent radio waves or the like may be used. Note that the abbreviations used in the description type and description declaration in FIG. 9 are as described in JIS D0810 and the like.

  Of the item numbers shown in FIG. 9, six terms “27” to “32” are newly added terms due to expansion. The contents defined in Non-Patent Document 1 can be used for these six terms.

  The item number “27” and the usage “BAID” indicate an area identification (area_code) for identifying the area where the broadcasting station exists. For example, as shown in FIG. 11A, the area identification has an 8-bit data width and is described in the lower 6 bits. For example, the area identification of the Kanto wide area is 1.

  The item number “28” and the usage “BPCH” indicate the physical channel (physical_ch) of the broadcasting station. As shown in FIG. 11B, the physical channel has a data width of 8 bits and is described in the lower 6 bits. For example, there are 27 physical channels for NHK in the Kanto wide area.

  The item number “29” and the usage “BCNM” indicate the broadcaster name (terrestrial_broadcaster_id) of the broadcast station. For example, as shown in FIG. 11C, the broadcaster name is described with 16 × n bits for the name of n characters.

  The item number “30” and the usage “BSID” describe the broadcast service ID (service_id). The broadcast service ID is described in 16 bits, for example, as shown in FIG. For example, the broadcasting service ID of NHK General's One Seg in the Kanto wide area is 0x0580 to 0x0587.

  The item number “31” and the usage “BRID” indicate the remote control ID (remote_control_key_id) of the broadcasting station. For example, as shown in FIG. 11E, the remote control ID has a data width of 8 bits and is described in the lower 4 bits. For example, the remote control ID of NHK general in the Kanto wide area is 1.

  The item number “32” and the usage “BNUM” indicate the branch number of the broadcasting station. For example, as shown in FIG. 11E, the branch number has a data width of 8 bits and is described in the lower 4 bits. For example, the branch number of the NHK general in the Kanto wide area is 0.

-Update broadcasting station information list-
A method of updating the mobile road guidance system broadcast station information list 43 stored in the storage unit 4 will be described using the flowchart of FIG.

  First, in step S21, the broadcast station list processing unit 31 of the processing unit 3 causes the tuner unit 112 to tune to the frequency of the specific broadcast station 5 that broadcasts the signal including the broadcast station list 51, and selects the specific broadcast station 5 to select a channel. Let

  In step S <b> 22, the broadcast station list processing unit 31 acquires the broadcast station list 51 obtained by the specific broadcast station 5 and received by the broadcast receiving unit 11 from the broadcast receiving unit 11, and stores it in the storage unit 4. It is stored as a broadcast station list 41.

  In step S23, the mobile road guidance system broadcast station information list processing unit 34 sets a pointer to one of the broadcast stations described in the broadcast station list 41 stored in the storage unit 4 in step S22. Set.

  In step S24, the mobile road guidance system broadcasting station information list processing unit 34 determines whether the broadcasting station set with the pointer is a broadcasting station whose specification has been changed or has been newly started based on the broadcasting station list 41. Determine. If it is determined that the broadcasting station has been changed after the specification is changed or is newly started, the process proceeds to step S25 to determine whether or not there is a parameter change in the broadcasting station list. When it is not determined that there is a parameter change, as a newly started broadcasting station, in step S26, the broadcasting station information of the broadcasting station that has started operating is added to the mobile road guidance system broadcasting station information list 43, Proceed to step S28. If it is determined that there is a parameter change, in step S27, the broadcast station information of the broadcast station whose specifications have been changed in the mobile station guidance system broadcast station information list 43 is updated as the broadcast station after the specification change, Proceed to S28. If it is not determined in step S24 that the broadcast station has changed its specifications or has newly started operation, the process proceeds to step S28.

  In step S <b> 28, the mobile road guidance system broadcasting station information list processing unit 34 determines whether or not the broadcasting station set with the pointer is the last broadcasting station in the broadcasting station list 41. If it is not determined to be the final broadcasting station, the process proceeds to step S29, a pointer is set to the next broadcasting station in the broadcasting station list, and the process returns to step S24. If it is determined that the station is the final broadcasting station, the process ends.

-Automatic tuning-
A method for the digital broadcast receiving apparatus 1 to automatically select a viewable broadcast station in the digital broadcast system according to the second embodiment will be described using the flowchart of FIG.

  First, in step S301, the current position information acquisition unit 12 acquires the current position information calculated by the current position information calculation unit 122 based on the signal received by the GPS antenna 121.

  In step S302, the automatic channel selection processing unit 35 of the processing unit 3 refers to the item number “27” and the broadcast area identification in the mobile station guidance system broadcast station information list 43. In step S301, the current position information acquisition unit 12 All broadcast stations with broadcast station information having a broadcast area identification that matches the broadcast area identification (area_code) of the current position information acquired by.

  In step S303, the distance calculation unit 32 of the processing unit 3 sets a pointer to one broadcast station among the broadcast stations read out in step S302.

  In step S304, the distance calculation unit 32, for the broadcast station set with the pointer, broadcast station position information of the item number “1” of the broadcast station information, and current position information acquired by the current position information acquisition unit 12 in step S301. Then, the distance from the current position to the broadcasting station is calculated.

  In step S305, the distance calculation unit 32 determines whether or not the broadcasting station whose distance has been calculated in the immediately preceding step S304 is the last broadcasting station among the broadcasting stations read in step S302. If it is determined that the station is the final broadcasting station, the pointer is released and the process proceeds to step S307. If it is not determined to be the final broadcasting station, the process proceeds to step S306, a pointer is set to the next broadcasting station for which the distance has not yet been calculated among the broadcasting stations read in step S302, and the process returns to step S304.

  In step S307, the automatic channel selection processing unit 35 selects the broadcast station whose distance from the current position is the closest among the broadcast stations whose distance from the current position is calculated in step S304. In step S308, the automatic channel selection processing unit 35 determines whether the distance from the current position of the broadcasting station selected in step S307 is closer than a predetermined threshold. The determination process in step S308 is performed to confirm that area one-segment broadcasting with a narrow broadcast area can be received.

  If it is not determined in step S308 that the threshold is closer than the predetermined threshold, the process returns to step S301. If it is determined that it is closer than the predetermined threshold value, in step S309, the automatic channel selection processing unit 35 causes the broadcast receiving unit 11 to select the broadcast station selected in step S307. In step S310, it is determined whether or not the broadcast station selected in step S309 can be viewed. If the broadcast station cannot be viewed, the process returns to step S301.

  As described above, by using the mobile road guide system broadcast station information list using POI information, for example, the broadcast stations that can be viewed are automatically selected based on the current position of the digital broadcast receiver 1 mounted on the vehicle. You can tune in. The mobile road guidance system broadcast station information list is generated based on the broadcast station list including the broadcast station position information of each broadcast station, so the distance to the broadcast station can be known, and in the area one-segment broadcasting with a narrow broadcast area, Broadcasting stations that can be viewed can be reliably selected.

(Other embodiments)
As described above, the present invention has been described according to the first and second embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in order to simplify the explanation, an example is described in which only frequency information is described as information indicating a broadcast wave. However, actually, various information described in the TMCC information is described as information indicating a broadcast wave. In addition, the information set by the processing unit 3 in the tuner unit 112 for channel selection is also described as setting only channel (frequency) information, but in practice, various information described in the TMCC information is set. Will do.

  Further, the determination process in step S112 described in the first embodiment may be determined using a broadcast output or the like in addition to the distance to the broadcast station.

  In addition, when a plurality of broadcasting stations installed at different positions simultaneously perform the same broadcast, the one with the same type code of the item number “14” in the broadcasting station information list 43 for the mobile road guidance system is preferentially selected. You may make it do. Thereby, when the transmitting station which is carrying out the same broadcast is in a short distance, even if a mobile body moves, it becomes possible to watch continuously.

  In addition to the above, of course, the present invention includes various embodiments and the like not described here, such as configurations to which the first and second embodiments are applied. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 1 ... Digital broadcast receiver 2 ... Touch panel 3 ... Processing part 4 ... Memory | storage part 5 ... Specific broadcast station 11 ... Broadcast receiving part 12 ... Current position information acquisition part 15 ... Audio | voice output part 21 ... Operation input part 22 ... Display part 31 ... Broadcast station list processing unit 32 ... Distance calculation unit 33 ... Preset processing unit 34 ... Broadcasting station information list processing unit for mobile road guidance system 35 ... Automatic channel selection processing unit 41 ... Broadcasting station list 42 ... Preset information 43 ... Mobile unit Broadcasting station information list for road guidance system 51 ... Broadcasting station list 111 ... Broadcasting antenna 112 ... Tuner unit 121 ... GPS antenna 122 ... Current position information calculation unit

Claims (3)

A digital broadcast transmission apparatus comprising a transmission section for broadcasting a broadcast station list including broadcast station position information indicating the position of each broadcast station and channel information of each broadcast station included in the digital broadcast;
A broadcast receiver for receiving the digital broadcast and obtaining the broadcast station list included in the digital broadcast;
A storage unit for storing a mobile road information system broadcast station information list including information on the broadcast station list in point information used in the mobile road guide system;
A broadcasting station information list processing unit that updates the mobile station guidance system broadcasting station information list stored in the storage unit based on the broadcasting station list acquired by the broadcasting receiving unit;
A current position information acquisition unit for acquiring current position information;
From the broadcast station position information included in the mobile road guidance system broadcast station information list stored in the storage unit and the current position information acquired by the current position information acquisition unit, from the current position to each broadcast station A distance calculation unit for calculating the distances of
A digital broadcast receiving apparatus including an automatic channel selection processing unit that selects a channel of the broadcasting station in order from a broadcasting station whose distance from the current position calculated by the distance calculation unit to each broadcasting station is short. A featured digital broadcast transmission / reception system. A broadcast receiving unit for receiving a digital broadcast broadcast including a broadcast station list including broadcast station position information indicating the position of each broadcast station and channel information of each broadcast station, and acquiring the broadcast station list; ,
A storage unit for storing a mobile road guidance system broadcast station information list including information on the broadcast station list in point information used in the mobile road guidance system;
A broadcasting station information list processing unit for updating the mobile station guidance system broadcasting station information list stored in the storage unit based on the broadcasting station list acquired by the broadcasting receiving unit;
A current position information acquisition unit for acquiring current position information;
From the broadcast station position information included in the mobile road guidance system broadcast station information list stored in the storage unit and the current position information acquired by the current position information acquisition unit, from the current position to each broadcast station A distance calculation unit for calculating the distances of
An automatic channel selection processing unit that selects a channel of the broadcasting station in order from a broadcasting station whose distance from the current position calculated by the distance calculation unit to each of the broadcasting stations is short; apparatus. A transmission step in which the digital broadcast transmitting apparatus broadcasts a broadcast station list including the broadcast station position information indicating the position of each broadcast station and the channel information of each broadcast station in a digital broadcast;
Digital broadcast receiver
Receiving the digital broadcast and obtaining the broadcast station list included in the digital broadcast; and
A broadcasting station information list processing step of updating a broadcasting station information list for a moving body road guidance system including information on the broadcasting station list in point information used in the moving body road guidance system based on the acquired broadcasting station list; ,
A current position information acquisition step for acquiring current position information;
Distance for calculating the distance from the current position to each broadcast station from the broadcast station position information included in the mobile road guidance system broadcast station information list and the current position information acquired in the current position information acquisition step. A calculation step;
An automatic channel selection processing step of selecting a channel of the broadcasting station in order from a broadcasting station whose distance from the current position calculated in the distance calculating step to each of the broadcasting stations is short. Method.

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