JPH0321980A - Map display device - Google Patents

Abstract

PURPOSE:To obtain a navigational function by providing a recording information reading means which reads a map information signal recorded on a recording position specified on a recording medium, a display means which displays a map according to the map information signal outputted from the recording information reading means. CONSTITUTION:A disk player 1 reads and outputs the recording data of a sector specified on a recording disk in which digitalized map data is recorded in advance. The outputted data is decode-processed and image information data is formed. The information data is supplied to a display controller 4. In the display controller 4, a video signal forming circuit 4c forms a video signal based on the image information data. Then, when a user is on the way to a destination, maps following routes are successively displayed every time a normally-reading key is depressed. When the user returns from the destination, maps following routes are successively displayed every time a reversely-reading key is depressed. Thus action as a navigation device is obtained.

Description

[Detailed description of the invention] Technical field The present invention relates to a map display device.

Background technology In recent years, the use of electronics in automobiles has progressed,
Brakes, suspensions, etc. have come to be controlled by computers, and map display devices used as so-called navigation devices used to guide vehicles to predetermined destinations have even come into practical use.

However, conventional navigation devices require various sensors for detecting the vehicle position, and require large-scale software and large-scale circuits to operate it, making them extremely expensive.

Summary of the Invention The present invention has been made in view of the above points, and includes:
The object of the present invention is to provide a simple map display device with navigational functions.

In this map display device using shouting, a map is displayed using a recorded information reading means that reads a map information signal recorded at a designated recording position on a recording medium, and a map information signal output from the recorded information reading means. Each time a storage command is issued, a designated recording position information signal specifying a recording position on the recording medium manually entered immediately before the storage command is issued is sequentially stored in the memory, and then a readout command is issued. Each time the designated recording position information signal is issued, the designated recording position information signals stored in the memory are sequentially read out in a predetermined order and supplied to the recorded information reading means.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, 1 is a disc player. The disc player 1 is configured to read and output recorded data in a designated sector on a recording disc called a CDROM, on which digitized (numerical) map data is previously recorded. This disk player 1 is supplied with data specifying sectors from a system controller 2.

The output data of the disc player 1 is supplied to the CD-R0M decoder 3 and decoded to form image information data consisting of, for example, digital data representing the color of each pixel point on a map. This image information data is supplied to the display controller 4.

In the display controller 4, image information data is supplied to a graphics controller 4a. The graphic controller 4a is configured to repeatedly perform a read operation of writing image information data into the graphic memory 4b and sequentially reading out the written image information data in a predetermined order. The output data of this graphic controller 4a is supplied to a video signal forming circuit 4C. The video signal forming circuit 4C is configured to form an NTSC video signal based on image information data. The video signal output from the video signal forming circuit 4c is supplied to the CRT display 5.

The system controller 2 is formed of a microcomputer including a processor, a ROM1 clock generator, a timer, etc., and controls each part in cooperation with the memory 7 in accordance with various commands output from the operation part 6. Further, the operation unit 6 is provided with keys for issuing various commands, such as a numeric keypad, a display command key, an automatic memory mode key, a mode release key, a memory key, a forward read key, and a reverse read key.

C attached to the disc player 1 in the above structure
The structure of each sector (block) of a recording disk called D-ROM is as shown in FIG. The header area of each sector contains 3 which represents the sector address.
Bytes of data are recorded, and 2,336 bytes of map data are recorded in the data area. These 2,3
38 bytes of map data is, for example, an area of a certain size that covers all of Japan (for example, 20,055 bytes published by the Geospatial Information Authority of Japan).
This data represents the location of roads in each area when the map is divided into 1:1000, 1:10,000, etc. maps. A map number is assigned to the map data of each of these areas. As the map number, for example, the sector address of the recorded sector can be used.

Next, the operation of the processor in the system controller 2 will be explained according to the flowchart in FIG.

During execution of the main routine, etc., the processor operates the numeric keypad, display command key, automatic memory mode key,
It is sequentially determined whether or not the mode release key, memory key, forward read key, and reverse read key have been pressed (steps S1 to S
7).

When it is determined that the numeric keypad has been pressed, the processor stores the numeric keypad data generated by the pressing of the numeric keypad in an internal register (step S8).

When it is determined that the display command key has been pressed, the processor sends the data held in the register in step S8 to the disc player 1 as sector address data specifying the sector, and also sends the data held in the register. Write to specified location X in memory 7 (
Steps S9, S10).

When it is determined that the automatic memory mode key has been pressed, the processor sets an automatic memory mode flag (step S11), and when it is determined that the mode release key has been pressed, the processor clears the automatic memory mode flag (step S11). S12).

When it is determined that the memory key has been pressed, the processor sets the data held in the register in step S8 to address n in a predetermined area of the memory 7 as map number data if the automatic memory mode flag is cleared.
, then add 1 to n, and when the automatic memory mode flag is set, the data stored in the predetermined location After writing to address n, 1 is added to n (steps S13 to S17). It is assumed that the initial value Y of n is set in advance by the main routine or the like.

Further, when it is determined that the sequential read key has been pressed, the processor reads the data written at address m in the memory 7 and sends it to the disc player 1, and
are added (steps S18, S19). It is assumed that the initial value of m is previously set to the same value as n by the main routine or the like.

Further, when it is determined that the reverse read key has been pressed, the processor reads the data written at address (n - 1) in the memory 7, sends it to the disc player 1, and subtracts 1 from n (step S20 , S21)
.

Through steps 313 to S17 in the above operations,
When the automatic memory mode flag is cleared, each time the memory key is pressed, the sector address entered manually using the numeric keypad is sequentially written into a predetermined area of the memory 7 as a map number, and when the automatic memory mode flag is set. The sector addresses of the sectors in which the map displayed on the CRT display 5 is recorded are sequentially written into a predetermined area of the memory 7 as a map number. As a result, when the memory key is pressed (N+1) times, as shown in FIG. 4, the number 1t in the predetermined area of the memory 7! ! From Y (Y+N
) stores data representing a map number (sector address).

Thereafter, each time the user presses the sequential read key on the operation unit 6, the map numbers (sector addresses) written in the predetermined area of the memory 7 in steps 818 and S19 are sequentially read out in the order in which they were written.

Also, each time the user presses the reverse read key, step 82
0.521, the map numbers (sector addresses) written in a predetermined area of the memory 7 are sequentially read out from the map number (sector address) written last.

Therefore, when heading towards a destination, maps according to the route will be displayed in sequence each time the forward read key is pressed, and when returning from the destination, maps according to the route will be displayed each time the reverse read key is pressed. The information will be displayed sequentially, providing the function of a navigation device.

In the above embodiment, only the map number (sector address) of the map of a single route is written in the memory 7, but the map number (sector address) of the map of a plurality of routes is written in the memory 7. It's okay. In this case, either the identification data representing the route is added to the map number (sector address) and written in the same area as the map number (sector address) as shown in FIG. 5, or the identification data representing the route is written in the memory 7. It may be possible to write to another head area that is set separately.

Effects of the Invention As detailed above, the map display device according to the present invention includes a recorded information reading means for reading a map information signal recorded at a designated recording position on a recording medium, and a map information reading means for reading a map information signal recorded at a designated recording position on a recording medium; A display means for displaying a map by a map information signal is provided, and each time a storage command is issued, a designation IA position information signal is provided that designates any recording position on the recording medium manually inputted immediately before the storage command is issued. After being sequentially stored in the memory, the designated recording position information signals stored in the memory are sequentially read out in a predetermined order and supplied to the recorded information reading means every time a successive command is issued.

Therefore, in the map display device according to the present invention, by sequentially inputting recording position information indicating the recording position of each of a plurality of maps showing the road on which the vehicle is scheduled to travel, in accordance with the route the vehicle is scheduled to travel, Maps are displayed in order according to the route the vehicle is traveling on, and it is not just an electronic atlas, but can provide functions with high utility value with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the format of each sector of a CD-ROM,
FIG. 3 is a flowchart showing the operation of the processor in the device shown in FIG. 1, and FIGS. 4 and 5 are diagrams showing map data written in the memory 7. Explanation of symbols of main parts 1...Disc player 2...System controller 7...Memory

Claims (1)

[Claims] Recorded information reading means for reading from a recording medium a map information signal recorded at a recording position corresponding to the supplied specified recording position information signal, and a display for displaying a map based on the map information signal output from the recorded information reading means. means, a memory, and a designated record for sequentially storing in the memory a designated recording position information signal that designates any recording position on the recording medium that was input immediately before the storage command was issued every time the storage command was issued. A map display comprising a position information signal writing means, and a control means that sequentially reads specified recorded position information signals stored in the memory in a predetermined order and supplies them to the recorded information reading means each time a read command is issued. Device.