JPH09270720A - Navigation device and tuning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform optimum reception at all times from a station for originating information. SOLUTION: Radio waves originated from an FM station are received in a reception part 12 and the reception level of the radio waves received in the reception part 12 is detected in a reception level detection part 13. Also, the position information of a vehicle obtained from a position measurement part 14 and the area information of an area information storage part 19 storing the area information for indicating an area capable of receiving the radio waves from the FM station are collated and the FM station based on the position information of the vehicle is selected in an area selection part 18. Then, in a tuning judgement part 20, in the case that the plural FM stations capable of reception are present in the reception part 12, based on the reception levels of the radio waves from the respective FM stations obtained from the reception level detection part 13 and the FM station based on the position information of the vehicle obtained from the area selection part 18, the FM station for performing the reception is judged and the reception part 12 is made to perform tuning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to multiplex information and VICS (Vehicle Information an) in FM text multiplex broadcasting.
The present invention relates to a navigation device and a tuning method for receiving various kinds of information such as information in d Communication System).

[0002]

2. Description of the Related Art A conventional navigation device will be described below.

FIG. 5 is a block diagram showing the structure of a conventional navigation device. In FIG. 5, reference numeral 1 is an infrastructure information unit that transmits various service information such as road traffic information as multiple information from the transmission unit 1a, 2 is a reception unit that receives the multiple information transmitted from the infrastructure information unit 1, and 3 is A position measuring unit that measures the position of the vehicle, 4 is a map storage unit that stores map data, 5 is a display unit that displays image information such as vehicle position information, received multiplex information, and map data,
A control unit 6 reads out map data of a predetermined area from the map storage unit 4 based on the vehicle position information and outputs the vehicle position information and the received multiplex information to the display unit 5 along with the read map data. is there.

The operation of the navigation device constructed as above will be described below.

As shown in FIG. 5, service information such as road traffic information is transmitted from the transmission section 1a of the infrastructure information section 1 as multiplex information in FM text multiplex broadcasting. The navigation device receives the multiplex information at the receiving unit 2. The received multiplex information is sent from the receiver 2 to the controller 6. Further, when the control unit 6 receives the position information of the vehicle from the position measurement unit 3, the control unit 6 reads out map data of a predetermined area corresponding to the position of the vehicle from the map storage unit 4 based on the position information of the vehicle. Map data processed by the control unit 6,
The vehicle position information and multiplex information are output to the display unit 5. As a result, the vehicle position information and various multiplex information are displayed on the map data displayed on the display unit 5.

[0006]

For example, in the case where the infrastructure information section 1 is a broadcasting station that performs FM character multiplex broadcasting, there are a plurality of broadcasting stations and the receiving vehicle moves over a long distance. It is predicted that the reception status of radio waves will change. Therefore, it is necessary to consider the reception state of radio waves in order to select the optimum broadcasting station that provides information. However, in the above conventional navigation device, the user himself has to tune in, and it is difficult to tune in to an appropriate information providing station, and the information to be obtained cannot be obtained in a timely and appropriate manner while driving. I had a problem.

In a system such as VICS,
When receiving road traffic information from multiple types of media,
Since the amount of information transmitted from the media and the area in which it can be received vary depending on the media, the conditions regarding which media to select according to the running state of the vehicle are not clear and there was a problem.

[0008] It is an object of the present invention to provide a navigation device and a tuning method capable of always performing optimum reception from a station transmitting information.

Another object of the present invention is to provide a navigation device which can always select and receive the optimum media from a plurality of types of media.

[0010]

In order to solve this problem, the present invention provides a receiving section for receiving radio waves emitted from a station, and a reception level detecting section for detecting the reception level of the radio waves received by the receiving section. A position measuring unit that measures the position of the vehicle,
The area information storage unit that stores the area information indicating the area that can receive radio waves from the station, and the vehicle position information obtained from the position measurement unit are collated with the area information stored in the area information storage unit to determine the vehicle position. When there are multiple receivable stations in the area selection unit and the reception unit that selects the station based on the information, the reception level of the radio wave from each station obtained from the reception level detection unit and the vehicle position obtained from the area selection unit A station selection determination unit that determines a receiving station based on the station based on the information and causes the receiving unit to select the station.

As a result, it is possible to obtain a navigation device that can always perform optimum reception from a station that transmits information.

Further, it is possible to obtain a navigation device capable of always selecting the optimum medium from a plurality of types of media and performing reception.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention includes a receiving section for receiving a radio wave emitted from a station, a reception level detecting section for detecting a reception level of the radio wave received by the receiving section, and a vehicle. The position measurement unit that measures the position of the vehicle, the area information storage unit that stores the area information indicating the area where the radio waves from the station can be received, and the vehicle position information that is obtained from the position measurement unit are stored in the area information storage unit. Collated with the area information
When there are a plurality of receivable stations in the area selection unit and the reception unit that selects a station based on vehicle position information,
Based on the reception level of the radio wave from each station obtained from the reception level detection unit and the station based on the vehicle position information obtained from the area selection unit, a station selection determination unit that determines the reception station and causes the reception unit to select a station. With such a configuration, it becomes possible to select an optimum station and perform reception according to the reception condition of the radio wave from the station that changes as the vehicle moves.

According to an eleventh aspect of the present invention, a receiver for receiving information transmitted from a plurality of types of media,
A media information selection unit that selectively outputs information from the media that could be received by the reception unit, a position measurement unit that measures the position and running state of the vehicle, a map storage unit that stores map data, and image data is displayed. A display unit and a control unit that selects at least one medium from media that could be received by the receiving unit based on vehicle information obtained from at least the position measuring unit and causes the media information selecting unit to selectively output the medium. With the configuration, it is possible to obtain information from the optimum medium according to the position and running state of the vehicle.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing the configuration of a navigation device according to a first embodiment of the present invention. In FIG. 1, 11 is, for example, road traffic information,
The infrastructure information section that transmits various service information as multiple information from the transmission section 11a, 12 the receiving section that receives the multiple information transmitted from the infrastructure information section 11, and 13 detects the reception level of the radio wave received by the receiving section 12. A reception level detection unit, 14 a position measurement unit that measures the position of the vehicle, 15 a map storage unit that stores digital map data, and 16 displays image data such as vehicle position information, received multiplex information, and map data. The display unit 17 for reading out the map data of a predetermined area from the map storage unit 15 based on the position information of the vehicle, and outputting the position information and the multiplex information of the vehicle to the display unit 16 together with the read map data. The unit 18 collates the position information of the vehicle output from the position positioning unit 14 with the area information stored in the area information storage unit 19 to determine the vehicle position. Area selection section for selecting a station based on, 20 received level detector 13, the area selecting section 1
8 is a channel selection determination unit that determines a receiving station based on the information output from 8.

The infrastructure information unit 11 is typically an FM broadcasting station that transmits FM character multiplex information, and this embodiment will be described as an example.

The position measuring unit 14 includes a plurality of GPS (Grobal
Positioning System) The position of the vehicle is detected by accumulating the position of the vehicle from the output data of the GPS receiver that detects the position of the vehicle by receiving the radio waves from the satellites at the same time and the self-supporting sensor (vehicle speed sensor, gyro sensor, etc.). There is a so-called self-contained navigation system, and further, there is a system for detecting the position by receiving radio waves from various beacons such as optical beacons and radio wave beacons installed near the road, and is not particularly limited.

In the map storage section 15, the CD-ROM (Comp
Map data is stored as digital information in a storage medium such as act Disk-Read Only Memory). Display 1
An LCD (Liquid Crystal Display) or the like is used for the display screen of 6.

The area information storage unit 19 stores, as area information, a geographical range in which radio waves transmitted from each FM station can be received.

The operation of the navigation device configured as described above will be described below.

As shown in FIG. 1, the position measuring unit 14 detects the position of the vehicle at predetermined time intervals. The vehicle position information output from the position positioning unit 14 is sent to the area selection unit 18 via the control unit 17. The area selection unit 18 compares the vehicle position information sent from the control unit 17 with the area information stored in the area information storage unit 19, and selects the FM station to which the vehicle position corresponds. The FM station selected here is output to the channel selection determination unit 20.

The reception level of the reception radio wave from the FM station that can be received by the reception unit 12 is detected by the reception level detection unit 13. The reception level may be electric field strength or the like. Further, in the receiving unit 12, FM
By scanning the frequency band used by the station, it is possible to detect the reception level of each broadcast station that can be received by the reception level detection unit 13. Furthermore, since the receiving unit 12 includes two tuners, even when receiving multiple information from a specific FM station that is one tuner, the other tuner can receive each FM station. It is also possible to detect the reception level. The reception level detected by the reception level detection unit 13 is output to the channel selection determination unit 20.

FIG. 2 is a flow chart showing the judgment operation of the channel selection judgment unit in the first embodiment of the present invention. As shown in FIG. 2, the tuning selection unit 20 first obtains information on the FM station selected by the area selection unit 18 (step 20).
1). Next, the information about the receivable FM stations and their reception levels detected by the reception level detection unit 13 is obtained (step 2).
02).

Based on the information obtained in steps 201 and 202, it is first determined whether or not there is one receivable FM station in step 202 (step 203). In step 203, if there is one receivable FM station, it is determined that it is the same FM station as the FM station selected by the area selection unit 18, and the area selection unit 1
The receiving unit 12 is selected by the FM station selected in step 8 (step 204). When it is determined in step 203 that there are a plurality of receivable FM stations, the reception levels of the FM stations detected by the reception level detection unit 13 are compared (step 205).

In step 205, the area selection unit 1
If the difference between the reception levels of the FM station selected in 8 and the other FM stations is equal to or greater than a predetermined value, the FM station having the best reception level is selected (step 206). On the other hand, if it is determined that the reception level difference is smaller than the predetermined value and there is not much difference, the process proceeds to step 204, and the FM station selected by the area selection unit 18 is selected.

When the FM station is selected in step 204 or step 206, the fact is output to the receiving section 12 and the receiving section 12 is made to receive the FM station (step 2).
07).

FIG. 3 is a conceptual diagram of channel selection judgment in the first embodiment of the present invention. This figure discloses a specific example of the determination operation of the channel selection determination unit 20 described in FIG.
In FIG. 3, the position C of the vehicle is located in the area A of the station A indicated by the area information, but the radio wave from the station A is also B.
It is also assumed that radio waves from the station can be received.

As shown in FIG. 3, the area selection unit 18 is
Based on the position C of the vehicle, station A is selected according to the area information stored in the area information storage unit 19. On the other hand, the reception unit 12 can receive the respective stations A and B, and the reception level detection unit 13 detects the reception levels of the radio waves transmitted from the stations A and B, respectively. Regarding this reception level, normally, as long as the position of the vehicle exists in the A area, the reception level of the radio wave from the A station is better than that of the B station. However, the radio wave is transmitted between the vehicle position and the A station. When there is a blocking mountain or the like, the situation of reception of radio waves from station A deteriorates, and the reception level of radio waves from station B may be better. In such a case, the radio wave from the B station in the B area is received. After that, the vehicle moves and the vehicle positions C'and A
When there is no obstruction between the station and the reception level of the radio wave from the station A is improved, the station A is selected again. When there is almost no difference between the reception levels of the radio waves from the A station and the B station, the tuning based on the position C of the vehicle is prioritized.

The multiplex information thus obtained is sent to the control unit 17. The control unit 17 reads out map data of a predetermined area from the map storage unit 15 based on the position of the vehicle detected by the position positioning unit 14, and outputs position information of the vehicle, multiplex information, and map data to the display unit 16. Various information obtained from the position of the vehicle and the multiplex information is displayed on the map data displayed on the display unit 16.

In this embodiment, multiple information is taken as an example, but it goes without saying that only voice information or only text information may be received.

The receiving section 12 may be composed of an existing tuner which is separate from the apparatus main body.

As described above, according to the present embodiment, when there are a plurality of receivable FM stations, it corresponds from the respective reception levels of the radio waves transmitted from these receivable FM stations and the vehicle position information. By determining the FM station that can perform optimum reception based on the FM station, it is possible to always perform optimum reception.

(Embodiment 2) FIG. 4 is a block diagram showing the configuration of a navigation device according to a second embodiment of the present invention, which is a navigation device for receiving information from a plurality of types of media having different receivable areas. Particularly in this embodiment, VICS (Vehicle Information and Communication)
A navigation device capable of receiving various kinds of information in the system will be described as an example.

In FIG. 4, reference numeral 21 denotes an infrastructure information section for transmitting various kinds of information from the transmitting section 21a. In VICS, VICS information is transmitted through optical beacons, radio wave beacons and FM multiplex broadcasting media. Reference numeral 22 is a VICS receiving unit that receives the VICS information from the infrastructure information unit 21, and includes an optical beacon receiving unit 22a, a radio wave beacon receiving unit 22b, and an FM multiplex receiving unit 22c. 23 is V
It is a media information selection unit that selects the information received by each reception unit of the ICS reception unit 22 and outputs it to the control unit 27 described below. Reference numeral 24 is a position positioning unit that outputs position information of the vehicle and information indicating the traveling state (vehicle speed information, direction information, etc.) to a control unit 27 described later, and includes a GPS receiver, a vehicle speed sensor, a gyro sensor, and the like. A map storage unit 25 stores map data and stores the map data as digital information in a storage medium such as a CD-ROM. Reference numeral 26 is a display unit for displaying image information such as vehicle information output from the position positioning unit 24, information received by the VICS receiving unit 22, and map data read out from the map storage unit 25. It has a screen. 27 outputs a media signal to the media information selection unit 23 based on the information from the position measurement unit 24 and the map storage unit 25, and outputs information from the position measurement unit 24, the media information selection unit 23, and the map storage unit 25. It is a control unit that controls and outputs to the display unit 26.

The operation of the navigation device configured as described above will be described below.

As shown in FIG. 4, the VICS information is transmitted from the transmission section 21a of the infrastructure information section 21 using a medium such as an optical beacon, a radio wave beacon, and FM multiplex broadcasting. In the navigation device, VICS from each media
The information is sent to the optical beacon receiver 22a of the VICS receiver 22,
The radio wave beacon receiving unit 22b and the FM multiplex receiving unit 22c respectively receive. VICS information is location information (place name,
Road names, intersection names, etc.), road obstacle information, simple graphic information, parking lot information, map information, etc. The VICS information received by the VICS receiving unit 22 is sent to the media information selecting unit 23.

In the control unit 27, the vehicle information (position, speed, direction, etc.) from the position measuring unit 25 and the map data (highway or general road, urban area or suburb) stored in the map storage unit 25. The media information selection unit 2 determines the media for which information is optimally provided based on
Output to 3. The media information selection unit 23 includes, among the information received by the optical beacon reception unit 22a, the radio wave beacon reception unit 22b, and the FM multiplex reception unit 22c of the VICS reception unit 22,
Any one according to the media selection signal from the control unit 27
Output to the control unit 27.

As the media selection signal output from the control unit 27 to the media information selection unit 23, for example, an optical beacon or a radio beacon is a narrow area, an FM multiplex broadcasting is a wide area, and in the present VICS, an optical beacon is an ordinary road, Since the radio wave beacon is installed separately from the expressway, the vehicle is traveling on the general road based on the vehicle position information obtained by the position positioning section 24 and the map data read from the map storage section 25. The optical beacon or the radio beacon is selected by determining whether the vehicle is traveling on the highway or on the highway. If the optical beacon is selected here, when the FM multiplex and the optical beacon are received by the navigation device while the vehicle is traveling on a general road in the city, the data is used as a medium in order to obtain more detailed information around the traveling point. An optical beacon with a transmission speed of about 1 Mbps is selected, and conversely, when traveling on a rural road or a suburban road, the information service by the beacon cannot be expected, so a media selection signal for selecting FM multiplex broadcasting is output. Further, when the vehicle speed is fast, it is possible to cover wide area information by FM multiplexing, and conversely, when the vehicle speed is slow, it is possible to perform a selection operation to obtain detailed narrow area information from the beacon.

The signal selected and output by the media information selection unit 23 is sent to the control unit 27, and the control unit 27 processes the sent signal into image data and displays it together with vehicle information and map data. It is output to the unit 26.

As described above, according to this embodiment, the VICS
In, by using the FM multiplex broadcasting that emits information in a wide area, the information obtained from media such as a radio beacon or an optical beacon that emits information in a narrow area, based on the running state of the vehicle and output to the user for display, The person can obtain the information from the media in a timely and appropriate manner without selecting the medium for transmitting the information.

[0042]

As described above, according to the present invention, the receiving unit for receiving the radio waves emitted from the station, the reception level detecting unit for detecting the reception level of the radio waves received by the receiving unit, and the position of the vehicle are positioned. A position positioning unit, an area information storage unit that stores area information indicating an area in which radio waves from a station can be received, and vehicle position information obtained from the position positioning unit that is stored in the area information storage unit. When there are a plurality of receivable stations in the receiving section and the area selecting section that matches and selects a station based on the vehicle position information, the reception level of radio waves from each station and the area selecting section obtained from the reception level detecting section Based on the station based on the position information of the vehicle obtained from, the configuration including a tuning determination unit that determines the receiving station and causes the receiving unit to tune According to the received status of the wave, it is possible to perform reception by selecting the optimum station, the user can obtain timely appropriate during operation the information from the station.

Further, a receiving section for receiving information transmitted from a plurality of types of media, a media information selecting section for selectively outputting information from the media which can be received by the receiving section, and positioning of the position and running state of the vehicle. From the media that could be received by the reception unit based on the position measurement unit, the map storage unit that stores the map data, the display unit that displays the image data, and at least the vehicle information obtained from the position measurement unit. By having at least one medium selected and a control unit for selectively outputting to the media information selection unit, it is possible to obtain information from the optimum medium according to the position and running state of the vehicle, and the user. Is useful in practice because it can obtain information from the appropriate media in a timely manner during driving.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a navigation device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a judgment operation of a channel selection judgment unit in the first embodiment of the present invention.

FIG. 3 is a conceptual diagram of channel selection judgment in the first embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a navigation device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional navigation device.

[Explanation of symbols]

 11 Infrastructure Information Section 11a Transmission Section 12 Reception Section 13 Reception Level Detection Section 14 Position Measurement Section 15 Map Storage Section 16 Display Section 17 Control Section 18 Area Selection Section 19 Area Information Storage Section 20 Channel Selection Judgment Section 21 Infrastructure Information Section 21a Transmission Section 22 VICS Receiver 22a Optical Beacon Receiver 22b Radio Beacon Receiver 22c FM Multiplex Receiver 23 Media Information Selector 24 Position Positioner 25 Map Storage 26 Display 27 Control

Claims (15)

[Claims] 1. A receiving unit for receiving a radio wave transmitted from a station, a reception level detecting unit for detecting a reception level of the radio wave received by the receiving unit, a position measuring unit for measuring the position of a vehicle, and a station. The area information storage unit that stores the area information indicating the area where the radio wave can be received, and the vehicle position information obtained from the position measurement unit are collated with the area information stored in the area information storage unit to determine the vehicle position. When there are a plurality of receivable stations in the receiving unit and an area selecting unit that selects a station based on information, the reception level of radio waves from each station obtained from the reception level detecting unit and the area selecting unit Based on the station based on the vehicle position information,
A navigation apparatus, comprising: a tuning determination unit that determines a receiving station and outputs a tuning signal to the receiving unit. 2. A navigation device comprising a position positioning unit that measures the position of a vehicle and a map storage unit that stores map data, and displays the position of the vehicle obtained by the position positioning unit on the map data. A reception unit that receives the radio waves transmitted from the station, a reception level detection unit that detects the reception level of the radio waves received by the reception unit, and area information indicating the area where the radio waves from the station can be received are stored. An area information storage unit, an area selection unit that collates the vehicle position information obtained from the position measurement unit with the area information stored in the area information storage unit, and selects a station based on the vehicle position information; When there are a plurality of receivable stations in the receiving unit, based on the reception level of the radio wave from each station obtained from the reception level detecting unit and the vehicle position information obtained from the area selecting unit. Based on another station, the navigation apparatus characterized by comprising a channel selection determination section for outputting a channel selection signal to the receiver to determine the incoming station. 3. A navigation device connected to a receiving unit for receiving a radio wave transmitted from a station, the receiving level detecting unit for detecting a reception level of the radio wave received by the receiving unit, and positioning of a vehicle. A position positioning unit, an area information storage unit that stores area information indicating an area where radio waves from a station can be received, and an area in which the vehicle position information obtained from the position positioning unit is stored in the area information storage unit. When there are a plurality of receivable stations in the area selection unit and the reception unit that matches the information and selects a station based on the vehicle position information, the reception level of the radio wave from each station obtained by the reception level detection unit And a tuning determination unit that determines a receiving station based on a station based on vehicle position information obtained from the area selecting unit and outputs a tuning signal to the receiving unit. That the navigation device. 4. The channel selection determination unit compares the reception levels detected by the reception level detection unit between a station based on vehicle position information obtained from the area selection unit and other stations, and the difference therebetween. Is a predetermined value or more, the station that obtains the best reception level is selected, and if the difference between the reception levels is smaller than a predetermined value, the station that is based on the position information of the vehicle is selected. The navigation device according to claim 1, claim 2, or claim 3. 5. The information received by the receiving unit is FM.
4. The navigation device according to claim 1, wherein the information is multiple information. 6. The position measuring unit is a GPS (Grobal Posit).
The navigation device according to claim 1, 2 or 3, further comprising a GPS receiver that receives radio waves from a satellite to determine the position of the vehicle. 7. The position measuring unit cumulatively calculates a distance sensor for detecting a moving distance of a vehicle, an azimuth sensor for detecting a moving azimuth of the vehicle, and output data of the distance sensor and the azimuth sensor. The navigation device according to claim 1, 2 or 3, further comprising: a position calculation unit that obtains the position of the vehicle by doing so. 8. The position locating unit includes an optical beacon receiver that receives a radio wave from an optical beacon provided near a road to obtain the position of the vehicle.
Alternatively, the navigation device according to claim 2 or claim 3. 9. The radio wave beacon receiver for receiving the radio wave from a radio wave beacon provided near a road to determine the position of a vehicle, according to claim 1 or claim 1. The navigation device according to claim 2 or claim 3. 10. A first step of obtaining a station based on vehicle position information, a second step of obtaining a reception level of a radio wave from a receivable station, and a plurality of stations receivable in the second step. If there are a plurality of receivable stations in the third step, it is determined that the station based on the reception level of the radio wave from each station and the vehicle position information. A fourth step of determining a station capable of optimal reception based on the following:
A fifth step of outputting a signal for causing the station selected in the fourth step to tune to the station. 11. The fourth step compares the reception levels of a station and other stations based on vehicle position information, and if the difference is a predetermined value or more, the best reception level is obtained. The station selection method according to claim 10, wherein a station is selected, and if the reception level difference is smaller than a predetermined value, the station is selected based on vehicle position information. 12. A receiving unit that receives information transmitted from a plurality of types of media, a media information selecting unit that selectively outputs information from the media that could be received by the receiving unit, and a vehicle position and running state. A positioning unit for positioning, a map storage unit for storing map data, a display unit for displaying image data, and a medium that can be received by the receiving unit based on at least vehicle information obtained from the positioning unit. A navigation device, comprising: a control unit that selects at least one medium from among the above, and causes the media information selection unit to selectively output the medium. 13. The reception unit is a VICS (Vehicle Info).
13. The navigation device according to claim 12, wherein information is received from an optical beacon, a radio wave beacon, and an FM multiplex broadcast in the Rmation and Communication System). 14. A first receiving unit that receives information from a first medium that sends information to a wide area, and a second receiving unit that receives information from a second medium that sends information to a narrow area.
A media information selection unit that selectively outputs the information received by the first or second reception unit, a position positioning unit that measures the position and traveling state of the vehicle, a map storage unit that stores map data, and image data. Based on the display unit to be displayed and at least the vehicle information obtained from the position measuring unit, the first
And a second medium, one of which is selected, and the media information selecting unit selectively outputs the selected one. 15. The first receiving unit is a VICS (Vehicl).
15. The information receiving apparatus according to claim 14, wherein the second receiving unit receives information from an optical beacon and / or a radio wave beacon in the e Information and Communication System), and the second receiving unit receives information from FM multiplex broadcasting in the VICS. Navigation device.