JP3087621B2 - Teletext broadcast receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a text multiplex broadcast receiving apparatus, and more particularly, to a text multiplex broadcast receiving apparatus which can be freely connected to / separated from a vehicle-mounted navigation apparatus.

[0002]

2. Description of the Related Art Conventionally, there is an in-vehicle navigation device that searches for an optimal route to a destination based on map information, displays the obtained route, and performs route guidance. For example, Japanese Unexamined Patent Application Publication No. 7-83885 proposed by the present applicant discloses that when teletext data of traffic information such as traffic congestion on a road of FM teletext is received by using a teletext receiver, traffic information is transmitted. It is described that data relating to a point is transmitted to a navigation device, an optimum route is searched based on the data relating to the point of the traffic information, and a new route is displayed.

[0003]

In a conventional on-vehicle navigation system, a teletext receiver (FM multiplex receiver) is integrated with the navigation system.
There is a problem that information of FM teletext broadcasted when the vehicle is not used cannot be used by the navigation device.

[0004] The present invention has been made in view of the above points,
By storing the character code data received during use separately from the in-vehicle navigation device, and transferring the position coordinate data in the character code data to the in-vehicle navigation device when connected to the in-vehicle navigation device, It is an object of the present invention to provide a text multiplex broadcast receiving apparatus which can be used in an in-vehicle navigation device to which text multiplex broadcast position coordinate data received at the time of use is connected.

[0005]

According to a first aspect of the present invention, there is provided a text multiplex broadcast receiving apparatus connectable / separable to an on-vehicle navigation apparatus, wherein position coordinate data demultiplexed from a received text multiplex broadcast. And data transfer means for transferring the position coordinate data stored in the storage means to the in-vehicle navigation device when connected to the in-vehicle navigation device.

For this reason, it becomes possible to transfer the position coordinate data contained in the code data of the teletext broadcast received when used outside the vehicle to a vehicle-mounted navigation device connected when the vehicle is used. According to a second aspect of the present invention, in the teletext receiving apparatus according to the first aspect, the data transfer apparatus further includes a selection unit that selects a single code data from a plurality of code data stored in the storage unit. The means transfers the position coordinate data of the code data selected by the selecting means.

For this reason, it is possible to select arbitrary code data from a plurality of code data received at the time of use outside the vehicle, transfer the position coordinate data included in the code data to the vehicle-mounted navigation device, and use it. The range of options, that is, the degree of freedom, is expanded.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of a portable teletext receiver according to the present invention. This teletext receiver is connected to a car navigation system.
It is separable and receives FM teletext.
In the figure, the high frequency signal received by the FM antenna 11 is F
The signal is supplied to the M tuner unit 12, where high frequency amplification, tuning, intermediate frequency amplification, and FM detection are performed. The multiplexed signal of the FM detection output obtained in this way is supplied to the FM multiplex decoder 1
3 is supplied.

[0009] Here, FM text multiplex broadcasting will be described. This service is based on DARC (DAta Radio Cha) standardized by BTA (Broadcasting Technology Development Council).
(nnel) method, and modulates at about 16 KBPS using a 76 kHz subcarrier. This actual data transfer rate has a capacity of about 7.6 KBPS, excluding error correction. As a result, JIS character codes (Kanji, Hiragana,
Katakana, numbers, etc.) for news, weather,
General information such as program guide and event information and traffic information are transmitted.

[0010] In the general information transmission mode, for example, it is added to various guide text data such as a guide text of an art museum or an event of a museum, an advertisement text of a store, or a notice text of a bazaar, various competitions, and various events. Send the position coordinate data in the same sentence. This position coordinate data uses latitude and longitude,
The message is transmitted in a format such as "N453012E1387859" that makes it easy for the recipient to see the liquid crystal display and understand the meaning. The position coordinate data based on the latitude and longitude is used as a numerical value up to the unit of seconds, whereby the position can be represented with an accuracy of about ± 15 m.

The general information and traffic information are formed by collecting several pieces of data of the same type to form a segment, and are broadcast on a segment basis. FM multiplex decoding section 13 in FIG.
Is the LMSK (Level C) defined by the DARC method.
ontrolled Minimum Shift Ke
ying) type FM multiplex demodulation. Further, error correction is performed by using the DARC-based (272.190) shortened difference set cyclic code, and the decoded character code data is output. This character code data is stored in the microcomputer 14
Supplied to

The microcomputer 14 uses, for example, a low power consumption type of 8 bits, and the microcomputer 14 takes in the decoded character code data from the data buffer of the FM multiplex decoding unit 13. Then, it identifies whether the character code data taken from the identification code defined by the BTA standard is general information or traffic information. In the case of general information, position coordinate data is detected, and the position coordinate data is stored in the RAM 17 in association with character string data of guidance, notification, and advertisement. Note that RO
The program executed by the microcomputer 14 is stored in M18.

As described above, RAM as storage means
17 stores a plurality of character code data. Here, when the operation switch unit 19 as the selection means is operated, the operation signal is supplied to the microcomputer 14, and the microcomputer 14 reads out the character code data instructed by the operation signal from the RAM 17 and sends it to the liquid crystal display control unit 15. Supply. As a result, the liquid crystal display control section 15 causes the supplied character code data to be displayed on the liquid crystal display section 16. This liquid crystal display section 16
Is in the selected state.

The connection judging section 20 judges whether or not the teletext receiving apparatus shown in FIG. 1 is connected to an in-vehicle navigation apparatus. A predetermined pin is grounded when connected, and a predetermined pin is fixed when not connected. The determination is made when the voltage is equal to or higher than the voltage (+4.0 V). When the data transfer unit 21 as a data transfer unit is connected to the data reception unit of the on-vehicle navigation device,
Transfers the position coordinate data read from the RAM 17 to the on-vehicle navigation device.

The battery section 22 supplies power to each of the circuit sections 12 to 21 of the entire apparatus. FIG. 2 shows a block diagram of an embodiment of a vehicle-mounted navigation device to which the present invention is connected. In the figure, GPS (Global
Positioning system) GPS antenna 30, GPS receiver 32,
Vehicle speed sensor 34, wheel speed sensor 36, geomagnetic sensor 38
Various sensors and an ECU 40 as a control unit are provided. The GPS receiver 32 receives a radio wave from a geodetic satellite in a satellite orbit via the GPS antenna 30. Based on the received radio waves, the ECU 40 calculates the latitude and longitude of the current position of the vehicle. Further, other sensors (vehicle speed sensor 34, wheel speed sensor 36, geomagnetic sensor 38)
Even if the radio wave from the satellite cannot be received, the position of the own vehicle can be calculated. For example, the wheel speed sensor 36 calculates how much the own vehicle has moved per unit time, and the wheel speed sensor 36 and the geomagnetic sensor 38 can calculate how much the own vehicle has changed its traveling direction. The detection of the amount of change in the traveling direction may be performed by a gyro system. Then, the relative movement amount detected by these sensors is associated with the map information stored in the CD-ROM 42, and the position of the own vehicle on the map is calculated by the ECU 40. The map information and the position of the host vehicle are superimposed and displayed on the display 44 to notify a driver or other user.

Further, the detected position of the vehicle and the map information are always compared (map matching), and it is determined whether the position on the map is an appropriate position. For example, when there is no road at the place where the vehicle is currently traveling and there is a road parallel to the traveling locus of the vehicle, the vehicle position is shifted and the current position is corrected to be on the road. Also,
Even when making a right or left turn at an intersection, the correction is performed from the position of the intersection. The position detection accuracy of the GPS or the like is compensated by such correction.

When the teletext broadcast receiving apparatus of FIG. 1 is connected to the navigation apparatus, the data receiving section 46 is connected to the data transfer section 21, and the position coordinate data transferred from the data transfer section 21 is the data reception section. The data is received by the unit 46 and supplied to the ECU 20.

Further, important information is notified by voice through a speaker 54 so that even if the user does not look at the display 44, it can be transmitted without fail. The input unit 56 is for the user to input various instructions, and it is preferable that a touch switch is provided on the display surface of the display 44 and the display 44 also serves as a part of the switch.

Here, the display on the display 44 is performed based on the data from the ECU 40. The drawing data processing unit 58 converts the map data and the like from the ECU 40 into data corresponding to the display on a one-to-one basis.
M60, which is read out and displayed in synchronization with the scanning of the display 44.

FIG. 3 shows a flowchart of a receiving process executed by the microcomputer 14 when the teletext receiver is a single unit. In the figure, in step S10, FM
The character code data is fetched from the multiplex decoder unit 13,
In step S12, it is determined from the identification code whether or not the segment is guidance message data including position coordinate data in general information.

Here, if it is not a segment of the guide text data, the process proceeds to step S10, and if it is a segment of the guide text data, the process proceeds to step S14, and each guide text data is cut out from this segment. Next, in step S16, position coordinate data is detected for each piece of guidance text data. here,
When the character code string of the guidance sentence data is searched and a space of one character is detected, N is detected, followed by a six-digit number, and then, after detection of E, a seven-digit number is continued. Detection.

Next, in step S18, each guidance message data is associated with the position coordinates detected from each guidance message data and RA
After that, the process proceeds to step S10 to repeat the above processing. As a result, as shown in FIG. 4, a segment of the guide text data transmitted from the FM broadcast station 70 by FM multiplexing is stored in the RAM 17 of the teletext receiver 80, and one of the guide text data is stored in the liquid crystal display unit 16. Is displayed.

FIG. 5 shows a flowchart of a data transfer process executed by the microcomputer 14 when the teletext receiver is connected to the car navigation system. That is, this process is started when the connection is determined by the connection determination unit 20. In the figure, at step S20, the guidance message data displayed on the liquid crystal display unit 16, that is, the position coordinate data of the selected guidance message data is read from the RAM 17. Next, the position coordinate data read in step S22 is transferred from the data transfer unit 21 to the navigation device, and the process ends.

FIG. 6 shows a flowchart of a route display process executed by the ECU 40 when the teletext receiving apparatus is connected to the on-vehicle navigation apparatus. In the figure, in step S30, the data transfer unit 21 sends the data
6 is received. Next, the position coordinate data received in step S32 is set as a destination, and in step S34, an optimal route from the current position to the destination is searched. This search uses, for example, the Dijkstra method. In this Dijkstra method, a road is divided for each intersection, and the time required to pass through this road is used as a cost, and a route that can be reached at a minimum cost is searched for.

After searching for the optimum route in this way, in step S36, the route to be traveled on the map is displayed in a specific color such as red on the display 44, and the mark of the current position is displayed. Get directions to your destination.
In this way, it becomes possible to transfer the position coordinate data included in the character code data of the teletext broadcast received when used outside the vehicle to the in-vehicle navigation device connected when the vehicle is used.

Further, arbitrary character code data is selected from a plurality of character code data received when used outside the vehicle,
The position coordinate data included in the character code data can be transferred to the in-vehicle navigation device and used.
The range of options, that is, the degree of freedom, is expanded.

In general, in a navigation system, in order to specify a destination, a method of specifying a destination position by scrolling, enlarging, or reducing the displayed map, or displaying a list of point names on a screen. And a method of sequentially selecting and specifying. In the method of using the list of point names, the address of prefecture, city, ward, large section, etc., and items such as golf courses, hotels, museums etc.
Specify the destination position. Enter your phone number and enter CD-
There is also a method of specifying the position data recorded in the ROM or the like.

However, from the point of view of the amount of information on the map display, it is common that general stores and small-scale points are not displayed on the map screen. May or may not be possible. Furthermore, in the case of a destination specification method using a list of point names, general stores and small-scale points generally have no data due to the amount of data, data freshness, maintenance, etc. Is impossible.

In this embodiment, however, the position coordinate code received by the teletext is transferred and the destination is automatically specified, so that the time and effort for specifying the destination can be saved. Furthermore, in general, when going out somewhere, at a home or office, etc., determine the destination, check the route to that location or the information around it by a map or a person, and then confirm the route to the car. It can be said that it is common to get in, but in the conventional navigation system, it is necessary to check after getting into the car, and it is assumed that it is not possible to reach the destination only with information obtained in the car,
The advantage of being able to easily arrive at the destination with a navigation system was not fully exhibited,
In this embodiment, such a point can be improved.

In the present embodiment, character code data is received from FM character multiplex broadcasting. However, the present invention is not limited to this. Character code data including character code data including position coordinate data may be transmitted from television character multiplex broadcasting. It may be obtained and is not limited to the above embodiment. Further, not only information premised on character display such as character code data but also information including information on a point belongs to the scope of the present invention as code data.

Incidentally, the teletext receiving apparatus and the in-vehicle navigation apparatus are not limited to a mechanical connection, but may be a connection by wireless communication or the like, and are not limited to the above embodiment.

[0032]

As described above, the first aspect of the present invention provides
In a teletext broadcast receiving apparatus which can be connected / separated from an in-vehicle navigation device, a storage means for storing code data including position coordinate data demultiplexed from the received teletext broadcast, and And data transfer means for transferring the position coordinate data stored in the storage means to the in-vehicle navigation device at the time of connection.

For this reason, it becomes possible to transfer the position coordinate data contained in the code data of the text multiplex broadcast received when used outside the vehicle to a vehicle-mounted navigation device connected when the vehicle is used. The invention according to claim 2 is the teletext receiving apparatus according to claim 1, further comprising a selection unit that selects a single code data from a plurality of code data stored in the storage unit. The data transfer means transfers the position coordinate data of the code data selected by the selection means.

Therefore, it is possible to select arbitrary code data from a plurality of code data received at the time of use outside the vehicle, transfer the position coordinate data included in the code data to the vehicle-mounted navigation device, and use it. The range of choices, that is, the degree of freedom is widened, which is extremely useful in practical use.

[Brief description of the drawings]

FIG. 1 is a block diagram of the device of the present invention.

FIG. 2 is a block diagram of a vehicle-mounted navigation device to which the device of the present invention is connected.

FIG. 3 is a flowchart of a receiving process.

FIG. 4 is a diagram for explaining the present invention.

FIG. 5 is a flowchart of a data transfer process.

FIG. 6 is a flowchart of a route display process.

[Explanation of symbols]

 Reference Signs List 11 FM antenna 12 FM tuner unit 13 FM multiplex decoder unit 14 Microcomputer 15 Liquid crystal display control unit 16 Liquid crystal display unit 17 RAM 18 ROM 19 Operation switch unit 20 Connection determination unit 21 Data transfer unit 32 GPS receiver 34 Vehicle speed sensor 40 ECU 42 CD -ROM 44 display 46 data receiving unit 58 drawing data processing unit 60 VRAM

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI G09B 29/10 G09B 29/10 A (56) References JP-A-6-276056 (JP, A) JP-A-9-16888 ( JP, A) JP-A-8-171696 (JP, A) JP-A-8-149029 (JP, A) JP-A-7-83685 (JP, A)

Claims (2)

(57) [Claims] 1. A text multiplex broadcast receiving apparatus connectable to and separable from an on-vehicle navigation device, comprising: storage means for storing code data including position coordinate data demultiplexed from a received text multiplex broadcast; And a data transfer means for transferring the position coordinate data stored in the storage means to the in-vehicle navigation device when connected to the navigation device for teletext. 2. The text multiplex broadcast receiving apparatus according to claim 1, further comprising: selecting means for selecting single code data from a plurality of code data stored in the storage means, wherein the data transfer means performs the selection. A character multiplex broadcast receiving apparatus for transferring position coordinate data of code data selected by the means.