JPH06229768A - Fm multichannel broadcasting/receiving system - Google Patents

Abstract

PURPOSE:To allow traveling on an appropriate route while avoiding snarl-up by superposing the vehicle position on a map image produced based on received data. CONSTITUTION:An FM multichannel broadcasting station 1-i broadcasts geographic data of map described by a mapping data on multichannels. In an on-board FM multichannel broadcasting/receiving system 10, a vehicle position detector 22 detects vehicle position and a data decoding circuit 19 decodes the received data which is classified by a decoder 20 for every service and stored in a memory 21. When an operating section 23 selects a convenient map, a controller 26 inputs a corresponding mapping data and a section 26c converts the geographic data into a vehicle position on a map image described by the mapping data thus determining a vehicle position marking point. A describing section 26d describes a map image on a video RAM 26e based on the mapping data along with the vehicle position mark. The image described on the video RAM 26e is presented on a display 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM multiplex broadcasting / reception system, and more particularly to an FM multiplex broadcasting / reception system for broadcasting / receiving an FM multiplex signal in which data including map drawing data is multiplexed with an audio signal.

[0002]

2. Description of the Related Art Providing map information and traffic information to an automobile makes it possible for the driver to make an accurate judgment regarding road conditions, promote driving on the best route, and prevent the occurrence of heavy traffic congestion and accidents. It is important to prevent.

In Europe, each FM broadcasting station multiplexes various data on an audio signal to perform FM broadcasting, and an RD that enables a receiver to realize various functions based on demodulated data.
S (radio data system) has been put to practical use. FM
Some of the broadcasting stations are traffic information broadcasting stations, and they broadcast traffic information within a certain area from the broadcasting station at a fixed time every day. The multiplexed data in RDS includes a traffic information broadcasting station identification code, a traffic information broadcasting identification flag, and the like. Even when a normal FM broadcast is being listened to, when the traffic information broadcasting starts at another station, The receiving station is automatically switched to the traffic information broadcasting station by using the traffic information broadcasting station identification code and the traffic information broadcasting identification flag so as not to miss the traffic information.

However, since the transmission of traffic information in the RDS is performed only by voice for a certain period of time, the contents of the traffic information cannot be confirmed repeatedly, and when there are a lot of traffic jams or traffic restrictions, the driver is concerned. Accurate recognition of traffic information was difficult.

On the other hand, in Japan, V is used as a system for externally providing the latest map information and traffic information to automobiles.
Commercialization of ICS is underway. What is VICS? (Vehicle Information & Commun)
ication System) is used for position information, such as quasi-microwave beacons, FM multiplex broadcasting, etc.
Data such as destination information, static information such as maps, traffic congestion information, and dynamic information such as temporary traffic regulations can be provided as data, and this information can be displayed on the screen when the driver desires it or automatically displayed on the screen. By doing so, smooth running is possible.

[0006]

V transmitted by FM multiplexing
The ICS data includes map drawing data for a relatively large area so that traffic jams, temporary traffic restrictions, accident locations, etc. can be visualized by associating them with roads. A simple map image can be displayed (see FIG. 2 (1)). According to this simple map image, traffic jams, temporary traffic regulations, and locations of accidents are continuously displayed in association with roads, so it is easy to understand even if there are many traffic congestions or traffic regulations. .

However, when the driver is driving in a geographically unguided area, it is not possible to know which place on the simple map image the automatic driver is driving, and there is traffic congestion or traffic regulation. Is there a car going to
There was a problem that it was not possible to confirm whether it was already passed and it was not possible to make an appropriate detour.
From the above, it is an object of the present invention to display the vehicle position in a map image based on map drawing data in an overlapping manner, and enable FM multiplex to enable traveling on an appropriate route while avoiding congestion and the like even in an unguided area. It is to provide a broadcast / reception system.

[0008]

In the present invention, the FM multiplex broadcasting station multiplexes data including geographical data of a map image drawn by map drawing data, while FM multiplex broadcasting is performed. The multiplex broadcast receiving device uses vehicle position detection means for detecting the vehicle position, and vehicle position corresponding to the detected vehicle position on the map image drawn based on the map drawing data using the map drawing data and the geographical data. Vehicle position mark display position determining means for determining the mark display position, and a vehicle for drawing the vehicle position mark on the map image at the vehicle position mark display position on the map image determined by the vehicle position mark display position determining means This is achieved by including the position mark drawing means.

[0009]

According to the present invention, the FM multiplex broadcasting station multiplex-broadcasts the data including the geographical data of the map image drawn by the map drawing data. On the other hand, the FM multiplex broadcast receiver is
The vehicle position is detected and the vehicle position mark display position corresponding to the detected vehicle position on the map image drawn based on the map drawing data is determined using the map drawing data and the geographical data. Then, the vehicle position mark is drawn at the determined vehicle position mark display position on the map image so as to be superimposed on the map image. As a result, the vehicle position can be displayed in a superimposed manner on the map image based on the map drawing data,
Even in areas where the driver is not guided, it is possible to drive on an appropriate route that avoids traffic congestion.

The vehicle position mark display position is a position corrected on the road on the map image. Thus, if the map drawing data includes roads with a certain density, the vehicle position mark can be correctly displayed on the road on which the vehicle is traveling.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram of an FM multiplex broadcasting / receiving system according to an embodiment of the present invention. 1-1, 1-2,
.., 1-i, ..., 1-n are FM multiplex broadcasting stations (fixed stations), which multiplex data into audio signals and generate FM multiplex broadcasting signals of a predetermined carrier frequency predetermined for each station. To broadcast. One of various service data transmitted from each station by FM multiplexing is VICS data. Here, this VICS data is targeted at a predetermined one or a plurality of predetermined areas adjacent to each other around the station. Includes one or more map drawing data for making it possible to visually identify traffic jams, temporary traffic regulations, places of occurrence of accidents, etc. with roads, and one or more sheets on the screen at the receiving side. The map image (simple map image) of can be displayed. Various service data are repeatedly updated at regular intervals while being updated as needed. When there are a plurality of map drawing data, an arbitrary one map image can be displayed by page selection on the receiving side.

The VICS data also includes geographical data indicating the geographical position of each map drawn by one or a plurality of map drawing data. This geographical data is transmitted as header information or as auxiliary information of each map drawing data. In this embodiment, it is assumed that the map is displayed with north facing upward, and The data is the latitude and longitude data of the diagonal apex ([X ₀ , Y in FIG.
₀ ], [X ₁ , Y ₁ ]).

Reference numeral 10 is an on-vehicle FM multiplex broadcasting receiver mounted on a vehicle, 11 is a receiving antenna, 12 is a front end (F / E) for extracting a received signal of a desired station from a received signal of the receiving antenna, 13 Is an IF / DET that amplifies the IF signal output from the front end and performs FM detection
A circuit (14) is a multiplexer (M) for performing stereo demodulation by inputting a stereo composite signal of the FM detection signals.
PX), 15 and 16 are low-frequency amplifier circuits for low-frequency amplification of audio signals for each channel, and 17 and 18 are speakers for each channel.

Reference numeral 19 is a subcarrier component of the FM detection signal input to demodulate data (including synchronization detection, error correction, etc.).
A data demodulation circuit 20 for performing the above is a service decoder, which sorts the received data into management data and page data for each service content and stores them in the memory 21. 22 is a vehicle position detection device that detects the vehicle position (longitude, latitude) and vehicle direction by GPS satellite navigation, 23 is a channel selection operation,
An operation unit for performing service selection operation (including page selection operation), 24 is a display unit for displaying the reception frequency and station name, 25
Is a display device for displaying image information received by FM multiplexing on the screen, and 26 is a controller for performing variable control of the tuning frequency of the front end 12 in accordance with a tuning operation by the operation unit 23, or the operation unit 23. In accordance with the service selection operation in step 1, desired data is input from various service data stored in the memory 21 and desired service operation is performed. For example, a simple map image such as the latest traffic jam information is displayed on the display device 25, and the vehicle position mark is also displayed in the simple map image.

Of the controller 26, 26a is the operation unit 2
Tuning control section for performing tuning control according to the tuning operation in 3.
6b is a storage unit for temporarily storing data, and 26c is an operation unit 2.
When a certain simple map page is selected by the service selection operation (including the page selection operation) in 3, the storage unit 2
A vehicle position mark display position determination unit that determines the vehicle position on the simple map and determines the corrected vehicle position mark display position on the road from the geographical data corresponding to the map drawing data of the corresponding page stored in 6b, 26d indicates that when a certain simple map page is selected by the selection operation,
A simple map image is drawn in a video RAM described later using the map drawing data of the corresponding page stored in the storage unit 26b, and the vehicle is placed at the position determined by the vehicle position mark display position determining unit on the simple map image. A drawing unit for drawing a vehicle position mark oriented in the azimuth direction, 26e is a video RAM for storing one screen image drawn by the drawing unit, and 26f is a display device for reading an image from the video RAM 26e and converting it into a predetermined video signal. 25 is a video conversion unit for outputting to 25.

FIG. 2 shows the vehicle position mark display position determining unit 26.
It is explanatory drawing of the determination method of the vehicle position mark display position by c. As shown in FIG. 2 (1), the screen coordinates (a, b) of the diagonal vertices A and C are (0, 0) and (1, 1) for roads, congestion points, etc. on one simple map to be displayed. The map drawing data is represented so as to be drawn on the screen, and each road is a set of screen coordinates (a ₁₁ , b ₁₁ ), (a ₁₂ , b ₁₂ ), which are the end points of each line segment approximated by a straight line,・
., (A ₂₁ , b ₂₁ ), (a ₂₂ , b ₂₂ ), (a ₃₁ ,
b ₃₁ ), (a ₃₂ , b ₃₂ ), (a ₄₁ , b ₄₁ ), (a ₄₂ , b
₄₂ ), (a ₄₃ , b ₄₃ ), ... On the other hand, the geographical data for the simple map of FIG. 2 (1) is the latitude and longitude coordinates of A and C as shown in FIG. 2 (2) [X.
₀ , Y ₀ ], [X ₁ , Y ₁ ].

[0017] Now, a longitude and latitude coordinates of the vehicle position [x, y], have a _{X 0 ≦ x ≦ X 1,} Y 0 ≦ y ≦ Y 1 contained in the simple map area in FIG. 2 (1) , The screen coordinates of the simple vehicle position P on the simple map are (a _X ,
When b _y) that, obtained by converting the _{a x = x-X 0 /} X 1 -X 0 b y = y-Y 0 / Y 1 -Y 0. Next, the perpendiculars RL ₁ to RL ₃ are dropped from the point P in the simple map to the surrounding roads, and the screen coordinates (a _X ′,
b _y ′) is determined to determine the corrected vehicle position mark display position on the road (see FIG. 2 (2)).

3 and 4 are flow charts showing the operation of the controller 26, and FIG. 5 is an explanatory view of an example of screen display, which will be described below with reference to these drawings. When a tuning operation is performed by the operation unit 23, the tuning control unit 26a outputs corresponding tuning control data to a PLL circuit (not shown) of the front end 12 to tune to a desired station (step 101 in FIG. 3, 10
2). At this time, the tuning frequency is displayed on the display unit 24.
Here, it is assumed that the front end 12 of the on-vehicle FM multiplex broadcasting receiver 10 is tuned to a certain FM multiplex broadcasting station 1-i including the vehicle position in the service area.

The FM multiplex broadcasting station 1-i uses VIC for audio signals.
The FM multiplex broadcast signal that is multiplexed with various service data including S data is broadcasted. The VICS data covers a plurality of predetermined areas around the station, and the latest congestion, temporary traffic regulation, and accidents. Includes a plurality of map drawing data for making it possible to understand the locations of occurrences, etc., of the roads and the like by roads, and geographical data indicating the geographical position of each simple map drawn by the map drawing data. ing. Various service data are repeatedly updated at regular intervals while being updated as needed.

After the FM multiplex broadcast signal is received by the receiving antenna 11 of the FM multiplex broadcast receiving apparatus 10, the received signal of the desired station is extracted from the received signal by the front end 12. Then, the IF / DET circuit 13 amplifies the IF signal and performs FM detection. The subcarrier component of the FM detection signal is input to the data demodulation circuit 19 to demodulate the data, and further, the service decoder 20 organizes the management data and page data for each service content and stores the management data and page data in the memory 21. The vehicle position detection device 22 detects the vehicle position (longitude and latitude) and the vehicle azimuth and outputs it to the controller 26.

The tuning controller 26a includes a front end 12a.
When tuning control is performed on the receiver, a request for the receiving station name is made to the service decoder 20, and the set is FM multiplex broadcasting station 1-i.
When the data relating to the receiving station name is received and stored in the memory 21, the service decoder 20 reads the data from the memory 21 and outputs the receiving station name to the tuning control unit 26a, and the tuning control is performed. The section 26a is the display section 24.
The receiving station name is displayed on the screen (steps 103 and 104).

In this state, when the driver performs a service selection operation including page selection on the operation unit 23,
The controller 26 inputs the corresponding data from the memory 21 via the service decoder 20 and temporarily stores the data in the storage unit 26b to perform a predetermined service operation (step 105).
~ 107, 108 or 109 or later). At this time, VIC
When one page of map drawing data in the S data is selected and the corresponding data is stored in the memory 21, the vehicle position mark display position determination unit 26c stores the one page map stored in the storage unit 26b. It is determined whether or not the current vehicle position detected by the vehicle position detection device 22 is included in the area of the simple map based on the drawing data (step 109,
110). This judgment is made by referring to the geographical data corresponding to the map drawing data.

If the vehicle position is included in the simple map in the determination of step 110, then the vehicle position mark display position determining unit 26c determines the vehicle position (x, y) expressed in latitude and longitude as the vehicle position on the simple map. After converting to (a _x , b _y ),
Further, the vehicle position mark display position (a _x ′, b _y ′) on the simple map is determined by making corrections on the road (step 11).
1). Thereafter, the drawing unit 26d draws a simple map image in the video RAM 26e based on the map drawing data stored in the storage unit 26b, and further, the vehicle position mark display position (a _x ′, b _y ′) on the simple map image. Then, the vehicle position mark directed to the vehicle direction detected by the vehicle position detection device 22 is drawn (steps 201 and 202 in FIG. 4).

Then, the image conversion section 26f is replaced by a video RAM.
The image drawn on 26e is read out, converted into a predetermined video signal and output to the display device 25, and the simple map image of the desired page received from the FM multiplex broadcasting station 1-i is displayed on the screen (step 203, FIG. 5). reference). As a result,
On the screen, a map that shows the places where traffic jams occur, along with roads and vehicle position marks, is displayed.Therefore, even when the driver is driving in an unfamiliar area, it is possible to avoid traffic jams etc. You can take the route.

After that, the controller 26 checks whether a channel selection operation has been performed (step 204) or a service selection operation has been performed (step 205). If neither has been performed, the process proceeds to step 109 in FIG. ,
The same processing as described above is repeated. As a result, the vehicle position mark on the mosaic map image moves as the vehicle moves,
The vehicle position on the mosaic map image can always be known. Therefore, a CD that stores map data
-Storage media such as ROM and IC memory card, CD-RO
The navigation information can be provided to the driver even if the M player and the card reading device are not provided.

If the vehicle position is not within the simple map area as determined in step 110, the drawing unit 26d
Draws only a simple map image in the video RAM 26e based on the map drawing data stored in the storage unit 26b (step 112), and does not draw the vehicle position mark. Then, in step 203 of FIG. 4, the simple map image not including the vehicle position mark is displayed.

According to this embodiment, the vehicle position mark can be displayed in a superimposed manner on the simple map image based on the map drawing data, and it is possible to avoid traffic congestion and the like even in an area where the driver is uninformed. It is possible to drive on the route.

In the above embodiment, the vehicle position mark display position is set to the position corrected to the road on the simple map.
The position may not be corrected. In addition, a simple map image is displayed in the north-up display, but by using geographical data, the map drawing data and the vehicle position mark display position data are coordinate-rotated according to the change in the vehicle direction, so that the heading with the vehicle direction as the upward direction. The up display may be displayed, and the north up display and the heading up display may be switchable. Further, in the above-mentioned embodiment, the simple map image is fixed to the screen regardless of the change of the vehicle position, but the vehicle position is fixed to the center of the screen, and the simple map image is scrolled according to the change of the vehicle position. May be.

The vehicle position may be detected by self-contained navigation using an azimuth sensor and a distance sensor instead of by GPS satellite navigation, or by a combination of GPS satellite navigation and self-contained navigation. Further, when the VICS data includes map drawing data for a plurality of pages, the simple map image displayed on the screen is assumed to be selected by the page selection operation, but is input from the vehicle position / vehicle direction detection device 22. Based on the present location data, one page of map drawing data including the vehicle position is automatically read from the memory 21, and a simple map image is displayed on the screen together with the vehicle position mark based on the map drawing data. The selection operation becomes unnecessary.

[0030]

As described above, according to the present invention, the FM multiplex broadcasting apparatus multiplex-broadcasts the data including the geographical data of the map image drawn by the map drawing data, while the FM multiplex broadcasting receiving apparatus is the vehicle. While detecting the position, the map drawing data and the geographical data are used to obtain the vehicle position corresponding to the detected vehicle position on the map image drawn based on the map drawing data, and further on the road in the map image. Since the vehicle position mark display position is corrected to determine the vehicle position mark display position on the determined map image and the vehicle position mark is drawn on the map image, the map image based on the map drawing data is displayed. It is possible to display the vehicle position on top of each other, and it is possible to travel on an appropriate route while avoiding traffic congestion and the like even in an area where the driver is not guided.

Further, since the vehicle position mark display position is the position corrected on the road on the map image, if the map drawing data includes the road with a certain density, the road on which the vehicle is traveling. The vehicle position mark can be correctly displayed on the top.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an FM multiplex broadcast / reception system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a method for determining a display position of a vehicle position mark.

FIG. 3 is a first flowchart showing the operation of the controller.

FIG. 4 is a second flowchart showing the operation of the controller.

FIG. 5 is an explanatory diagram showing a screen display example.

[Explanation of symbols]

1-1, 1-2, ..., 1-i, ..., 1-n FM multiplex broadcasting station 10 In-vehicle FM multiplex broadcasting receiver 12 Front end 14 IF / DET circuit 19 Data demodulation circuit 20 Service decoder 21 Memory 22 vehicle position detection device 25 display device 26 controller 26c vehicle position mark display position determination unit 26d drawing unit 26e video RAM 26f image conversion unit

Claims (2)

[Claims] 1. An FM multiplex broadcasting station that multiplexes an audio signal and data including map drawing data to perform FM broadcasting, and receives an FM broadcast in which data including an audio signal and map drawing data is multiplexed and receives an audio signal. In an FM multiplex broadcasting / reception system including an FM multiplex broadcasting receiving device that demodulates and reproduces sound and demodulates data to draw a map image on a display means, an FM multiplex broadcasting station draws map drawing data. Data including geographical data of a map image to be multiplex-broadcasted. On the other hand, the FM multiplex broadcast receiving device uses vehicle position detecting means for detecting a vehicle position and map drawing data and geographical data. A vehicle position mark display position determining means for determining a vehicle position mark display position corresponding to a detected vehicle position on a map image drawn based on map drawing data; FM multiplex broadcasting characterized by including vehicle position mark drawing means for drawing the vehicle position mark on the map image at the vehicle position mark display position on the map image determined by the position mark display position determining means. / Reception system. 2. An FM multiplex broadcasting station that performs FM broadcasting by multiplexing a voice signal and data including map drawing data, and receives an FM broadcast in which the data including the voice signal and map drawing data is multiplexed and receives the audio signal. In an FM multiplex broadcasting / reception system including an FM multiplex broadcasting receiving device that demodulates and reproduces sound and demodulates data to draw a map image on a display means, an FM multiplex broadcasting station draws map drawing data. Data including geographical data of a map image to be multiplex-broadcasted. On the other hand, the FM multiplex broadcast receiving device uses vehicle position detecting means for detecting a vehicle position and map drawing data and geographical data. , The vehicle position corresponding to the detected vehicle position on the map image drawn based on the map drawing data is obtained, and further corrected on the road in the map image to display the vehicle position mark. Vehicle position mark display position determining means for determining the vehicle position mark display position, and vehicle position mark drawing for drawing the vehicle position mark on the map image at the vehicle position mark display position on the map image determined by the vehicle position mark display position determining means. An FM multiplex broadcasting / reception system characterized by including means.