JP2853775B2 - Data 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 data broadcast receiving apparatus, and is suitably applied to, for example, a navigation system mounted on a mobile body such as an automobile.

[0002]

2. Description of the Related Art Conventionally, in a navigation system mounted on a vehicle, the position of the vehicle is detected using a gyro device or a position detecting device using a satellite, for example, and the resulting position information is displayed on a display screen. It is displayed so as to be superimposed on the issued road map.

[0003] In practice, a road map is stored in a large-capacity storage means such as a CD-ROM or the like. By reading a road map near the current position in accordance with detected position information,
The position information that changes every moment can be displayed on an optimal road map in a superimposed manner.

In such a navigation system, since a road map stored in advance on a CD-ROM is read out, newly opened roads or traffic regulations which have been additionally changed can be displayed as a road map near the current position. There was a difficult point that I could not do.

Here, recently, for example, PSK (phase shift)
keying) FM modulated digital data with independent carrier
There is a data broadcasting system multiplexed with radio broadcasting. As this digital data, a road map which is continuously divided in advance, map information such as a map number and a place name representing the road map, and road traffic information in the map are used. A road traffic information system that sequentially broadcasts road traffic information of each section as one information unit has been proposed.

Accordingly, the navigation system also has a built-in data broadcast receiving device capable of receiving the above-mentioned data broadcast, and receives a data broadcast in addition to a road map stored in a CD-ROM. If the road map obtained by using the above is used, it is possible to superimpose and display the position information on the latest road map in addition to the road traffic information, and it is thought that the usability of the user can be significantly improved. .

[0007]

The data broadcast receiving apparatus 1 for receiving the data broadcast as described above is configured as shown in FIG. 3, and is a data multiplexed and broadcasted to an FM radio broadcast. The broadcast is received by the antenna 2 and input to the tuner circuit 3 as an FM broadcast signal S1.

[0008] As this data broadcast, digital data consisting of a road map and map information representing a road map is a PS.
It is K-modulated and multiplexed with FM radio broadcast as a digital signal having an independent carrier wave and broadcast.

A channel number signal C1 designated by the user by operating the operation panel 4 is input to the channel circuit 3 as channel selection information C2 through the system control circuit 5, whereby the channel circuit 3 is set to the channel designated by the user. The FM radio broadcast of the number C1 is selected, and the selected broadcast signal S2 obtained as a result is input to the demodulation circuit 6.

[0010] The demodulation circuit 6 is a band pass filter or a PSK.
The demodulator includes a demodulator, extracts a PSK-modulated digital signal component included in the selected broadcast signal S2, and demodulates the digital signal component by PSK to obtain digital data D1 as a road map. Write to memory 7.

In the case of the data broadcast receiving apparatus 1, the user determines whether or not to display the digital data D1 consisting of the road map stored in the memory 7 by operating the operation panel 4 using the map information corresponding to the road map. To be able to specify
The data control signal C3 obtained as a result is input to the memory control circuit 8 through the system control circuit 5.

The memory control circuit 8 has a data control signal C3
And generates a memory control signal C4 based on the digital data D which is a road map stored in the memory 7.
1 is controlled according to the user's specification. The memory control circuit 8 returns a control result for the memory 7 to the system control circuit 5 as a response signal.

In practice, digital data D2 consisting of a road map read from the memory 7 in response to a user operation
Is a display control signal C input from the system control circuit 5.
The digital data D1 which is transmitted to the display device 10 through the output processing circuit 9 controlled by the control unit 5 and is a road map received as a data broadcast in this way is displayed on the display screen of the display device 10.

However, in the data broadcast receiving apparatus 1, it is practically difficult to provide the memory 7 with a capacity for taking in the digital data D1 corresponding to all the road maps to be transmitted. Therefore, in practice, the digital data D1 is fetched into the memory 7 in the broadcasting order, and the old digital data D1 is overwritten with the new digital data D1.

In this case, the digital data D1 consisting of the road map required by the user is replaced with the new digital data D1.
And the user no longer exists in the memory 7, and the user has to wait until the required road map is sent again. As a result, the user's usability is still insufficient. Atsuta.

The present invention has been made in view of the above points, and is intended to propose a data broadcast receiving apparatus which can solve the conventional problems at a glance and can improve the usability of a user.

[0017]

According to the present invention, in order to solve the above-mentioned problems, digital data D1 comprising road maps TA and TB and map information representing the road maps, which are segmented in advance, are modulated in a predetermined manner. Information setting means 2 for setting and inputting map information according to a road map required by a user in advance in a data broadcast receiving apparatus 20 adapted to receive a data broadcast to be modulated and broadcast in a system.
2 and 23, and digital data D10 which is a road map in a range corresponding to the map information set by the reception information setting means 22 and 23 among the digital data D1 included in the received data broadcast is selected and stored. And a storage data selection unit 21 for performing the operation. Further, in the present invention, the digital data D comprising the road maps TA and TB which have been sectioned continuously in advance and the map information representing the road maps are provided.
Information setting means for setting and inputting map information corresponding to a road map required by a user in advance in a data broadcast receiving apparatus 20 adapted to receive a data broadcast which is modulated by a predetermined modulation method and broadcasted When there is not enough free space to capture digital data representing the required map information between the destination P2 and the current location P1 set by the reception information setting means 22, 23,
A storage data selecting means for setting a temporary destination P10 between the destination P2 and the current location P1, and taking in at least digital data representing required map information between the temporary destination P10 and the current location P1; Prepare. Further, in the present invention, the storage data selecting means 21 updates the temporary destination P10 according to the update of the current location P1.

[0018]

According to the present invention, of the digital data D1 included in the received data broadcast, only the digital data D10 which is a road map based on the map information corresponding to the required road map set in advance by the user is stored. The usability of the user can be remarkably improved with a minimum memory capacity.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

In FIG. 1, in which parts corresponding to those in FIG. 3 are assigned the same reference numerals, reference numeral 20 denotes a data broadcast receiving apparatus as a whole, wherein digital data D1 comprising a road map obtained from the demodulation circuit 6 is temporarily stored. Storage data selection circuit 2
1 is input.

In the data broadcast receiving apparatus 20, digital data D composed of a road map received as a data broadcast is provided.
1, the road map required by the user is displayed on the operation panel 2.
In this storage data selection circuit 21, digital data D10 consisting of a road map required by the user and a road map around it is selected in accordance with a margin of the memory 7, and this is selected. The data is stored in the memory 7.

In the case of this embodiment, as a method of designating a road map required by the user from the operation panel 22, as shown in FIG. 2, the latitude and longitude information representing the current location P1 and the destination P2 is input. It has been done.

As a result, the system control circuit 23
When a destination 1 and a destination P2 are input, road maps TA0, TA1,... Including a route connecting the two points with a straight line are included.
.., TA7 and TA8 (shown by solid lines in FIG. 2) are regarded as road maps required by the user.

Accordingly, the highest priority is added to the map information, and the road maps TB0 and TB around the map information are assigned the highest priority.
1,..., TB10 and TB11 (shown by broken lines in FIG. 2) are added with priorities that become lower toward the periphery to generate a storage data selection signal C20. And to the memory control circuit 24.

Thus, the storage data selection circuit 21 selects the digital data D10 of the road map specified by the input storage data selection signal C20 from the digital data D1 of the road map received as the data broadcast, This is sent to the memory 7.

Further, the memory control circuit 24 sends the map information to which the priority is added as the memory control signal C21 to the memory 7, whereby the memory 7 detects the remaining capacity of the memory, and firstly determines the remaining capacity of the memory. If the number is large, all of the input digital data D10 is stored in the memory 7.

On the other hand, when the remaining capacity of the memory is small, of the input digital data D10, the digital data D10 are discarded in order from the one having the lowest priority.
Digital data D1 consisting of a road map required by the user and a road map around the user according to the margin of the memory 7;
0 is stored efficiently.

As a result, the road map required by the user is always stored in the memory 7, and the user operates the operation panel 2
When the user operates 3 to specify map information corresponding to a necessary road map, the road map stored in the memory 7 is read out as digital data D11 and displayed on the display screen of the display device 10.

As described above, in the data broadcast receiving apparatus 10 of this embodiment, the received digital data D1
Digital data D consisting of a road map required by the user and a road map around the user according to the margin of the memory 7
10 is stored so that the usability of the user can be improved without increasing the memory capacity.

Further, the data broadcast receiving apparatus 1 of this embodiment
In the case of 0, the current location P1 can be updated successively in accordance with the movement, and the distance between the destination P2 and the current location P1 is so long that the entire road map including the route connecting the two points with a straight line cannot be captured. In such a case, the temporary destination P10 is set in a range where all the road maps can be sufficiently taken in on the route connecting the two points.

Each time the current location P1 is updated, the temporary destinations P10, P11, and P12 are also sequentially updated. In this way, the usability of the user can be remarkably improved with a minimum necessary memory capacity. I have.

According to the above configuration, of the digital data D1 received as a data broadcast, only the digital data D10 consisting of the road map required by the user and the road map around it according to the remaining capacity of the memory 7 are stored. By doing so, the data broadcast receiving apparatus 10 can greatly improve the user's convenience with a minimum required memory capacity.
Can be realized.

In the above-described embodiment, a case has been described in which the road map required by the user is automatically determined according to the present location and the destination input by the user. Map information of a road map to be entered may be input.

In the above-described embodiment, the case where the present invention is applied to the navigation system has been described. However, the present invention is not limited to this, and it is essential that the present invention is applied to a television signal multiplexed or a facsimile broadcast. The present invention is suitable for wide application to various types of data broadcast receiving devices.

[0035]

As described above, according to the present invention, of the digital data included in the received data broadcast, only the digital data consisting of a road map in a range corresponding to the required road map set in advance by the user is used. By storing the data, it is possible to realize a data broadcast receiving apparatus that can significantly improve the user's usability with a minimum memory capacity.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a data broadcast receiving apparatus according to one embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a method of setting a road map required by a user.

FIG. 3 is a block diagram showing a conventional data broadcast receiving device.

[Explanation of symbols]

1, 20 data receiving device, 2 antenna, 3
...... Tuner circuit, 4,22 ... Operation panel, 5,23
... System control circuit, 6 demodulation circuit, 7 memory, 8, 24 memory control circuit, 9 output processing circuit, 10 display device, 21 storage data selection circuit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-46379 (JP, A) JP-A-61-138981 (JP, A) JP-A-64-70790 (JP, A) 36586 (JP, A) JP-A-3-203770 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04B 1/16 G01C 21/00 G08G 1/0969 G09B 29/10

Claims (3)

(57) [Claims] 1. A data broadcast which is capable of receiving a data broadcast which is obtained by modulating a road map previously segmented in a continuous manner and digital data comprising map information representing the road map by a predetermined modulation method. A receiving information setting means for setting and inputting the map information according to the road map required by the user in advance; and a receiving information setting means of the digital data included in the received data broadcast. And a storage data selecting means for selecting and storing the digital data of the road map in a range corresponding to the set map information. 2. A road map which is continuously segmented in advance and the road map
Digital data consisting of map information representing the road map is stored.
It can receive data broadcasts that are modulated by a fixed modulation method and broadcast.
In the data broadcast receiving apparatus, the map according to the road map required by the user in advance
Receiving information setting means for setting and inputting information; a destination set by the receiving information setting means;
Digital representing the required map information between the ground and the above
If there is not enough free space to capture the data,
Set a temporary destination between the destination and the above current location,
Necessary location between the temporary destination and the current location
Stored data selection to capture digital data representing diagram information
Data broadcasting receiving instrumentation, characterized in that it comprises the-option means
Place. Wherein said stored data selection means, especially to update the temporary destination in accordance with the current location of the update
3. The data broadcast receiving device according to claim 2, wherein