JP2009089280A - Mobile receiver, and preset method of broadcast station of mobile receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to automatically preset a receivable broadcast station without discontinuing receiving of a broadcast signal of a digital TV broadcast in a mobile receiver. <P>SOLUTION: A base station coordinate of an Nth broadcast station in a broadcast station information table 17 held in a memory in advance is obtained (Fig.2, S14). The distance from a mobile receiver 11 to a base station of the Nth broadcast station is calculated from a present position coordinate obtained from a base station coordinate of the Nth broadcast station and a car navigation system (S15). If the distance is within a specified radius (S16, YES), the Nth broadcast station is preset in a memory as a receivable broadcast station (S18). The above treatment is carried out to all the broadcast stations registered in the broadcast station information table 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mobile receiver that receives a broadcast signal of a digital television broadcast and a preset method for a broadcast station of the mobile receiver.

  In-vehicle radio receivers must be switched to a receivable broadcast station frequency when the vehicle moves out of the broadcast station radio wave coverage area. Conventionally, there is a known method for presetting a broadcasting station by receiving a broadcast wave while switching the tuning frequency of a tuner before starting viewing and storing the frequency in an internal storage device when the broadcast wave is detected. Yes.

  In addition, the frequency of broadcast stations that can be received for each area such as prefecture units is held in the receiver in advance, and the user can select an area to automatically preset the broadcast stations that can be received in that area. It has been known.

  However, in the former method, since the receivable broadcasting stations are switched as the vehicle moves, it is necessary to search for receivable broadcasting stations each time, and it is necessary to interrupt reception of radio broadcasts when searching for the broadcasting stations. .

  In the latter method, the user needs to perform an operation of switching areas, and the operation is complicated. Furthermore, since the area is fixedly determined in units of prefectures or the like, there is a disadvantage that even if there is a broadcasting station that can actually be received, broadcasting stations outside the area are not preset.

  Recently, an in-vehicle receiver that receives digital TV broadcast signals has been put into practical use, and even in this in-vehicle receiver, it is possible to automatically preset a receivable broadcasting station without interrupting viewing. It is desired.

  In Patent Document 1, in a radio receiver, the current position of a vehicle is detected, the received electric field strength is calculated based on the current position, the distance between the broadcasting stations, and the transmission power of the broadcasting stations. It is described to preset.

  In Patent Document 2, broadcast station data indicating the position of an FM broadcast station is stored in a CD-ROM of a navigation apparatus together with map data, and the affiliated broadcast station information transmitted by FM multiplex broadcasting by an FM receiver is stored. Receives, calculates the distance between the current position of the vehicle and each affiliated broadcast station, sorts the affiliated broadcast station information in order of increasing distance, and rearranges the rearranged affiliated broadcast station information to the FM radio receiver. It is described to remember.

The invention of the above-mentioned Patent Document 2 is intended to find an affiliated broadcast station with a good reception state among affiliated broadcast stations of a specific FM broadcast station when the FM broadcast reception state deteriorates. There is no suggestion to automatically preset broadcast stations that can be received without interrupting the viewing of digital TV broadcasts.
JP-A-9-135184 JP 2000-110504 A

  An object of the present invention is to enable a mobile receiver to automatically preset a receivable broadcast station without interrupting reception of a broadcast signal of a digital television broadcast.

  A mobile receiver according to the present invention is a mobile receiver that receives a broadcast signal of a digital television broadcast, and includes acquisition means for acquiring current position information from a position information acquisition device, and position information of base stations of a plurality of broadcast stations. Base station position information storage means for storing, a broadcast station where the base station exists within a certain distance from the current position based on the position information of the plurality of base stations and the current position information, and receiving the specified broadcast station Preset means for setting as a possible broadcasting station.

According to the present invention, receivable broadcast stations can be automatically preset without interrupting reception of digital television broadcast signals.
In the mobile receiver of the above invention, the base station position information storage unit stores information in which position information of base stations of a plurality of broadcast stations and broadcast station names are associated with each other.

  By configuring in this way, the distance between the current position information and the position information of the base station is calculated, the base stations of the broadcast stations within a certain distance are specified, and those broadcast stations can be received as memory stations that can receive them. Etc. can be preset.

  In the mobile receiver of the above invention, the position information acquisition device is a GPS device that receives a signal transmitted from a satellite and acquires current position information, and is a portable device having the GPS device.

  With this configuration, it is possible to realize a portable device capable of specifying a receivable digital television broadcast station based on position information received from GPS and automatically presetting the broadcast station.

  ADVANTAGE OF THE INVENTION According to this invention, when a vehicle etc. move, the broadcast station which can be received can be preset, receiving the broadcast signal of a digital television broadcast.

  Hereinafter, preferred embodiments of the present invention will be described. FIG. 1 is a block diagram of a mobile receiver 11 according to an embodiment. The mobile receiver 11 is, for example, an in-vehicle receiver that receives a broadcast signal of a digital television broadcast.

  The mobile receiver 11 includes a tuner 12, a non-rewritable memory 13 and a rewritable memory 14. The non-rewritable memory 13 is composed of, for example, a ROM, and the rewritable memory 14 is composed of a flash memory that can rewrite data and retains the data even when the power is turned off.

  The tuner 12 demodulates the broadcast signal received by the antenna 15 and outputs video and audio signals to a display device (not shown). The tuner 12 has a control unit (not shown). The control unit acquires the current position information from the car navigation device (position information acquisition device) 16 and obtains the coordinate data of the base station of the broadcast station from the non-rewritable memory 13. Acquire and identify a broadcasting station within a certain distance from the current position. Then, the broadcast station is preset in the rewritable memory 14 as a receivable broadcast station.

  A non-rewritable memory 13 stores a broadcast station information table 17 in which coordinate data of a base station of a broadcast station, a channel number, and a broadcast station name are associated with each other. The first broadcast station information table 17 stores, for example, the coordinates (Xa, Ya) of the base station of the AAA broadcast station, the channel number “13”, and the AAA broadcast station that is the broadcast station name in association with each other. Yes. The second of the broadcast station information table 17 stores the coordinates (Xb, Yb) of the base station of the BBB broadcast station, the channel number “15”, and the BBB broadcast station that is the broadcast station name in association with each other. The third station of the broadcast station information table 17 stores the coordinates (Xc, Yc) of the base station of the CCC broadcast station, the channel number “17”, and the CCC broadcast station as the broadcast station name in association with each other. Similarly, the coordinates of the base stations of a plurality of broadcasting stations, channel numbers, and broadcasting station names are stored in association with each other.

The rewritable memory 14 stores a broadcast station name set by a preset process described later.
FIG. 2 is a flowchart of the preset processing of the broadcasting station in the mobile receiver 11. The following processing is executed by a control unit (not shown) of the mobile receiver 11.

First, current position information is acquired from the car navigation system (car navigation device 16) (S11 in FIG. 2).
Next, “0” is set as the value of the counter N for designating data in the broadcast station information table 17 (S12). Next, it is determined whether or not the value of the counter N is larger than the maximum number of data registered in the broadcast station information table 17 (S13). The broadcast station information table 17 is a table in which broadcast station names, channel numbers, and base station coordinates are associated with each other, and is stored in the non-rewritable memory 13 in FIG.

  When the value of the counter N is equal to or smaller than the maximum number of data registered in the broadcast station information table 17 (S13, NO), the process proceeds to step 14 and N in the broadcast station information table 17 held in advance. Get the base station coordinates of the th broadcast station.

  On the other hand, when the value of the counter N is larger than the maximum number (S13, YES), since reading of data of all broadcast stations registered in the broadcast station information table 17 has been completed, the processing is ended there.

  The distance from the mobile receiver 11 to the base station of the Nth broadcasting station is calculated from the base station coordinates of the Nth broadcasting station acquired from the broadcasting station information table 17 and the current position coordinates acquired from the car navigation device 16. (S15).

Next, it is determined whether or not the distance calculated in step 15 is within a radius specified in advance (S16).
When the distance from the base station of the specific broadcasting station to the mobile receiver 11 is equal to or larger than the radius specified in advance (S16, NO), the process proceeds to step 17 and "1" is added to the value of the counter N and the process returns to step 13. . By adding “1” to the value of the counter N, the base station coordinates of the next broadcasting station in the broadcasting station information table 17 are designated, and thus the above-described processing is repeated for the base station coordinates.

  When it is determined that the distance from the base station of the broadcast station to the mobile receiver 11 is within the designated radius (S16, YES), the process proceeds to step 18 and the broadcast station name designated by the counter N is set as a receivable broadcast station. Preset to the rewritable memory 14. Thereafter, the process proceeds to step 17, and after adding “1” to the value of the counter N, the above-described processing is repeated until the value of the counter N becomes larger than the maximum number.

Here, the preset operation of the broadcast station when the broadcast station that can be received by the mobile receiver 11 changes as the vehicle moves will be described with reference to FIG.
In FIG. 3, a circle indicated by a solid line centering on the receiving station (mobile receiver 11) indicates a receivable area, and a broken line indicates a prefectural border.

  When the receiving station mounted on the vehicle moves to the position of the coordinates (X1, Y1) in FIG. 3, the coordinate data of the base station of each broadcasting station is obtained by referring to the broadcasting station information table 17, and each receiving station receives each coordinate data from the receiving station. Calculate the distance to the base. Then, broadcast stations whose distances are within a certain value are specified as broadcast stations capable of receiving digital television broadcast signals, and these broadcast stations are preset in the rewritable memory 14.

In the present embodiment, broadcasting stations within a certain distance from the receiving station are preset in the rewritable memory 14 as follows.
The coordinates (Xa, Ya) of the base station of the AAA broadcast station in the U prefecture are acquired from the broadcast station information table 17, and the distance between them is calculated from the coordinates and the current position coordinates (X1, Y1). Then, the base station of the AAA broadcast station determines whether or not it exists within a radius XX km preset by the viewer. In this case, as shown in FIG. 3, since the distance from the receiving station to the base station of the AAA broadcast station is within XX km, it is preset in the rewritable memory 14 as a broadcast station that can be received by the AAA broadcast station.

  Similarly, the base station coordinates (Xb, Yb) of the BBB broadcast station registered in the broadcast station information table 17 are acquired, and the distance between them is calculated from the coordinates and the current position coordinates (X1, Y1). Then, it is determined whether or not the calculated distance is within XX km. In this case, since the distance from the receiving station to the base station of the BBB broadcasting station is within XX km, it is preset in the rewritable memory 14 as a broadcasting station that can be received by the BBB broadcasting station.

  Similarly, the base station coordinates (Xc, Yc) of the base station of the CCC broadcasting station in the neighboring prefecture V are obtained from the broadcasting station information table 17, and both of them are obtained from the coordinates and the current position coordinates (X1, Y1). Calculate the distance. When the distance obtained by calculation is within XX km, the CCC broadcasting station in the V prefecture is preset in the rewritable memory 14 as a receivable broadcasting station.

In this case, since the distance to the base station of other broadcast stations other than the above AAA broadcast station, BBB broadcast station, and CCC broadcast station is XX km or more, these broadcast stations are not preset.
In this way, not only the broadcasting station in the U prefecture where the vehicle is currently traveling, but also the CCC broadcasting station in the neighboring V prefecture whose distance from the receiving station is within XX km is automatically preset as a receivable broadcasting station. The The preset operation of these broadcasting stations can be performed without interrupting the viewing of digital TV broadcasting.

  Next, when the vehicle moves to the position of the coordinates (X2, Y2) of the V prefecture, the receiving station refers to the coordinate data of the base station of each broadcasting station registered in the broadcasting station information table 17 as described above. Identify stations within a certain distance from

  The coordinates (Xd, Yd) of the base station of the DDD broadcasting station in the V prefecture are obtained from the broadcasting station information table 17, and the distance between the two is calculated from the coordinates and the current position coordinates (X2, Y2), and the distance is within XXkm. It is determined whether or not. In this case, since the distance from the receiving station to the base station of the DDD broadcasting station is within XX km, it is preset in the rewritable memory 14 as a broadcasting station that can be received by the DDD broadcasting station.

  Similarly, the coordinates (Xc, Yc) of the base station of the CCC broadcasting station in the V prefecture are obtained from the broadcasting station information table 17, and the distance between the two is calculated from the coordinates and the current position coordinates (X2, Y2). Is determined to be within XX km. In this case, since the distance from the receiving station to the base station of the CCC broadcast station is within XX km, it is preset in the rewritable memory 14 as a broadcast station that can be received by the CCC broadcast station.

  Similarly, the coordinates (Xe, Ye) of the base station of the EEE broadcast station in the adjacent Z prefecture are acquired from the broadcast station information table 17, and the distance between the two is calculated from the coordinates and the current position coordinates (X2, Y2). . In this case, since the distance from the receiving station to the base station of the EEE broadcast station is within XX km, it is preset in the rewritable memory 14 as a broadcast station that can be received by the EEE broadcast station in the Z prefecture.

Thus, not only the broadcasting station of the prefecture V where the vehicle is currently traveling, but also the broadcasting stations of other prefectures within a certain distance from the receiving station can be preset as receivable broadcasting stations.
Next, when the vehicle travels a certain distance and the receiving station moves to the position of the coordinates (X3, Y3) of W prefecture, the base station of each broadcasting station registered in the broadcasting station information table 17 as described above. The broadcast station existing within a certain distance from the receiving station is identified.

  The coordinates (Xf, Yf) of the base station of the FFF broadcasting station in W prefecture are obtained from the broadcasting station information table 17, and the distance between the two is calculated from the coordinates and the current position coordinates (X3, Y3), and the distance is within XXkm. It is determined whether or not. In this case, since the distance from the receiving station to the base station of the FFF broadcasting station is within XX km, it is preset in the rewritable memory 14 as a broadcasting station that can be received by the FFF broadcasting station.

  Similarly, the distance between both is calculated from the coordinates (Xe, Ye) of the base station of the EEE broadcasting station in the Z prefecture and the current position coordinates (X2, Y2). In this case, since the distance between the two is within XX km, it is preset in the rewritable memory 14 as a broadcast station that can be received by the EEE broadcast station in the Z prefecture.

In this case, since the distance to the base station of other broadcast stations is XX km or more, those broadcast stations are not preset.
According to the above-described embodiment, when the position of the mobile receiver 11 changes, a broadcast station in which a base station exists within a certain distance from the current position of the mobile receiver 11 is automatically set as a receivable broadcast station. Can be preset to memory. Thereby, even when the receivable broadcast station changes due to the movement of the vehicle, the receivable broadcast station can be automatically preset in the memory without interrupting the viewing of the digital television broadcast. In addition, broadcasting stations that are within a certain distance from the mobile receiver 11 are preset instead of presetting broadcasting stations that exist in a predetermined area such as a prefecture unit, so that, for example, the vehicle is located near the prefectural border. When moving, it is possible to solve the problem that even within the same prefecture, a broadcasting station that is far from the receiving station is preset and the signal of the broadcasting station cannot be received.

  Note that the fixed distance XXkm for determining a receivable broadcasting station may be set arbitrarily by the user, or a fixed value may be set in the mobile receiver 11 in advance. The preset process described above is executed when the vehicle has moved a certain distance or more, or when the vehicle has traveled for a certain time or more. The preset process may be executed under conditions other than those described above.

FIG. 4 is a diagram showing a broadcasting station preset in the rewritable memory 14 when the receiving station is at each coordinate in FIG.
When the receiving station is at the position of coordinates (X1, Y1), the broadcasting station shown in FIG. 4A is preset by the above-described preset processing. That is, the AAA broadcast station name, channel number “13”, and base station coordinates (Xa, Ya) within the radius XX km are preset in association with each other. Further, the name of the BBB broadcasting station within the radius XX km, the channel number “15”, and the base station coordinates (Xb, Yb) are preset in association with each other. Further, the CCC broadcast station name, channel number “17”, and base station coordinates (Xc, Yc) of broadcast stations in other prefectures within the radius XX km are preset in association with each other. Note that the data to be preset in the rewritable memory 14 is sufficient as long as it is information that can identify the broadcast station (for example, the broadcast station name or channel number), and the base station coordinates need not be retained.

  Next, when the receiving station moves to the position of coordinates (X2, Y2), the broadcasting station shown in FIG. 4 (B) is preset by the preset process described above. That is, the CCC broadcast station name, channel number “17” and base station coordinates (Xc, Yc) within the radius XX km, and the DDD broadcast station name, channel number “14”, and base station coordinates (Xd, Yd) are associated with each other. Preset. Further, the EEE broadcast station name, channel number “18”, and base station coordinates (Xe, Ye) of broadcast stations in other prefectures within the radius XX km are preset in association with each other.

  Next, when the receiving station moves to the position of coordinates (X3, Y3), the broadcasting station shown in FIG. 4C is preset by the preset processing described above. That is, the EEE broadcast station name, channel number “18”, and base station coordinates (Xe, Ye) of broadcast stations in other prefectures within XX km are preset in association with each other. Also, the FFF broadcasting station name, channel number “19”, and base station coordinates (Xf, Yf) of broadcasting stations in the same W prefecture are preset in association with each other.

The present invention is not limited to the embodiment described above, and may be configured as follows, for example.
(1) The present invention can be applied not only to a vehicle-mounted receiver but also to a portable device such as a mobile phone having a GPS function and a digital TV broadcast signal reception function.

It is a block diagram of the mobile receiver of an embodiment. It is a flowchart of the preset process of a mobile receiver. It is explanatory drawing of the preset operation | movement of a broadcasting station. It is a figure which shows an example of the data preset.

Explanation of symbols

11 Mobile Receiver 12 Tuner 13 Non-Rewritable Memory 14 Rewritable Memory 15 Antenna 16 Car Navigation Device 17 Broadcasting Station Information Table

Claims (4)

A mobile receiver for receiving a digital television broadcast signal,
Acquisition means for acquiring current position information from the position information acquisition device;
Base station location information storage means for storing location information of base stations of a plurality of broadcasting stations;
Preset means for specifying a broadcast station where the base station exists within a certain distance from the current position based on the position information of the plurality of base stations and the current position information, and setting the specified broadcast station as a receivable broadcast station. Mobile receiver.   The mobile receiver according to claim 1, wherein the base station position information storage means stores information in which position information of a base station of a broadcast station is associated with a broadcast station name.   The mobile receiver according to claim 1, wherein the position information acquisition device is a GPS device that receives a signal transmitted from a satellite and acquires current position information, and is a portable device having the GPS device. A preset method for a broadcast station of a mobile receiver that receives a broadcast signal of a digital television broadcast,
Get the current location information from the location information acquisition device,
Memorize | stores the positional information on the base station of a some broadcasting station in a memory | storage means,
Broadcast of a mobile receiver that identifies a broadcast station where a base station exists within a certain distance from the current position based on the position information of the plurality of base stations and the current position information, and sets the identified broadcast station as a receivable broadcast station Station preset method.