Patent Application
20060224300
The present invention relates to a system and a method for providing information of a moving object's state of move and a location data collection system, for providing to a car navigation system state-of-move information such as a location distribution, a moving speed distribution, or a moving direction distribution of a moving object including a pedestrian and the like, based on location data indicated by a wireless terminal device such as a mobile phone device. The invention also relates to the car navigation system.
In recent years, mobile phone devices have remarkably become widespread, so that two-third of a total population are said to carry mobile phone devices now. Some mobile phone devices include a positioning function using a GPS (Global Positioning System), for example, so that provision of a navigation system for a pedestrian or the like has already been commercialized. Further, an attempt to detect the location and the moving speed of the mobile phone device or a person carrying the mobile phone device, thereby utilizing the mobile phone device for traffic safety has also been started.
According to a technique disclosed in paragraphs 0015 to 0028, paragraphs 0032 to 0037, FIGS. 3 to 8 of JP-A-2004-157847, for example, when a person who is carrying a mobile phone device crosses a road at a pedestrian crossing or the like, the mobile phone device transmits to a car navigation system mounted on a vehicle information that the person is crossing the road. Then, when the crossing of the road by the pedestrian is performed in front of the vehicle, the car navigation system that has received the information issues to the driver of the vehicle an alarm indicating that there is the pedestrian who is crossing a road.
According to an example of a technique disclosed in this specification, the moving speed and the moving direction of the mobile phone device is obtained from location data obtained by the GPS. Further, by referring to the direction of a road obtained from map information, crossing of the road by a person carrying the mobile phone device is detected. Further, there are shown an example where transmission of information from the mobile phone device to the car navigation system is directly performed by short-distance communication means or unit between the mobile phone device and the car navigation system and an example where the transmission of the information is broadcast from a base station for the mobile phone device to the car navigation system.
However, in the prior art described before, after the person who is carrying the mobile phone device has started the crossing of the road, the action of crossing the road is detected. Thus, if the vehicle has approached the crossing person, occurrence of an accident may not be prevented even if the alarm is issued by the car navigation system. Further, when a pedestrian is walking along the road, no alarm is issued. Accordingly, especially when the driver of a vehicle has overlooked such a pedestrian during the night or the like, a risk of the traffic accident cannot be reduced.
In view of the problems of the prior art described above, an object of the present invention is to provide a system and a method for providing information of a moving object's state of move, a location data collection system, and a car navigation system that use the car navigation system to present to the driver of a vehicle information on a location distribution, a moving speed distribution, a moving direction distribution, or a feature of a pedestrian or a vehicle, thereby enabling calling of attention to the possibility of an accident in advance.
In order to achieve the object described before, a system for providing information of a moving object's state of move according to the present invention is configured to include:
a wireless terminal device carried by a moving object and located in a predetermined area;
a wireless base station for communication with the wireless terminal device using a predetermined wireless communication channel;
a location data collection system connected to the wireless base station, for collecting data of a location where the wireless terminal device is located; and
a car navigation system mounted on a vehicle and including a communication unit, for performing communication with the wireless base station using the wireless communication channel and an output unit for presenting to a driver of the vehicle information on a guided route to a destination. Then, the system for providing information of a moving object's state of move configured as described above is characterized by operating as follows:
First, the wireless base station sends to the wireless terminal device information requesting a reply to information including the data of the location where the wireless terminal device is located. Then, the wireless base station receives information sent back by the wireless terminal device as the replay in response to the information requesting the reply, and outputs the received information to the location data collection system. Next, the location data collection system inputs the information output by the wireless base station and extracts the data of the location where the wireless terminal device is located, based on the input information. Then, the location data collection system generates state-of-move information comprising information including at least one of a location distribution, a moving speed distribution, and a moving direction distribution of the wireless terminal device and information obtained by filtering these information, based on the extracted data of the location. The location data collection system broadcasts the generated state-of-move information to the car navigation system located in the predetermined area through the wireless base station. On the other hand, the car navigation system receives the state-of move information broadcast by the location data collection system and outputs the received state-of-move information to the output unit, thereby presenting the received state-of-move information to the driver of the vehicle.
As described above, according to the present invention, the location data collection system equally collects location data of wireless terminal devices located in the predetermined area. In other words, the location data of people carrying the wireless terminal devices including a vehicle passenger and a person who is located indoors as well as a pedestrian is collected. Then, based on a result of the collection, the information such as the location distribution, moving speed distribution, and moving direction distribution is obtained. Further, the information obtained by filtering those information (hereinafter collectively referred to state-of-move information) is generated. The generated state-of-move information is sent to the car navigation system, and output to the output unit such as a display device of the car navigation system, thereby being presented to the driver of the vehicle.
Accordingly, the driver of the vehicle can know the location distribution, the moving speed distribution, and the moving direction distribution of a vehicle as well as of a pedestrian in the predetermined area including the location of his own vehicle. For this reason, the driver can grasp a state of a traffic jam or traffic congestion in the predetermined area. Accordingly, the driver can also avoid a road with an unusually great number of pedestrians, for example, where an accident tends to occur.
In the present invention, even if only one pedestrian is walking along a road, his moving speed or moving direction can be displayed. Accordingly, even in a condition such as during the night or on a left-curving road in which the pedestrian is difficult to see, the driver can readily become aware of the presence of the pedestrian.
According to the present invention, the driver of a vehicle can grasp the location and movement of a pedestrian or a vehicle in the predetermined area including the location of his own vehicle, in advance. Accordingly, at the time of driving the vehicle, the driver can early recognize the pedestrian or the like visually. Thus, the possibility of causing a traffic accident can be reduced.
An embodiment of the present invention will be described below in detail with reference to drawings.
<Overall Configuration>
The mobile phone device 1 includes a positioning function using a GPS. By receiving an electric wave from a GPS satellite 5 as necessary, the mobile phone device 1 can detect the data of the location where the mobile phone device 1 is located. In this embodiment, the mobile phone device 1 detects the location data in response to a location data transmission request transmitted from the mobile phone base station 2, and sends back the detected location data to the mobile phone base station 2. As the mobile phone device 1 described above, a mobile phone device of a type including a GPS function that is commercially available now can be used without alteration.
The mobile phone base station 2 is provided to use a several-hundred-meter to several-kilometer square or circular area as the service area for wireless communication, and directly performs wireless communication with the mobile phone device 1 located within that service area. On the other hand, the mobile phone base station 2 is connected to a mobile phone switching station not shown, and serves to relay communication between the mobile phone device 1 and the mobile phone switching station. In this embodiment, the mobile phone base station 2 is further connected to the location data collection system 3, receives the location data of the mobile phone device 1 transmitted by the mobile phone device 1, and outputs the received location data of the mobile phone device 1 to the location data collection system 3.
The location data collection system 3 is connected to the mobile phone base station 2, inputs the location data of the mobile phone device 1 output from the mobile phone base station 2, and collects the location data of the mobile phone device 1 located in the service area of the mobile phone base station 2. The location data collection system 3 generates information on such fields as a location distribution, a moving speed distribution, and a moving direction distribution of the mobile phone device 1, and information obtained by filtering these information (information of a state of move), based on the collected location data of the mobile phone device 1. Then, the location data collection system 3 broadcasts these generated information on the state of move to the car navigation system 4 through the mobile phone base station 2.
The car navigation system 4 includes a map display unit, as in a common car navigation system, and displays a map in the vicinity of a location in which a vehicle including the car navigation system 4 is located and a guided route to a destination on the map display unit. In this case, the car navigation system 4 may be the car navigation system of an independent type including a function of computing map information and the guided route. Alternatively, the car navigation system 4 may be the car navigation system of a communication type in which the map information and the guided route are supplied from a server in a center. In this embodiment, however, it is necessary for the car navigation system 4 to enable communication with the mobile phone base station 2 using the predetermined communication channel, and to further include a function of displaying the information of the state of move.
As described above, the system for providing information of a moving object's state of move can be implemented by adding the location data collection system 3 to a mobile phone communication system and the car navigation system of (the communication type) including the conventional mobile phone device 1, mobile phone base station 2, car navigation system 4; and GPS satellite 5. Details of a configuration and an operation of the location data collection system 3 will be described below.
<Configuration and Operation of Location Data Collection System>
The information processing unit 30 is a so-called computer, which is constituted from an arithmetic processing unit (CPU: central Processing Unit) not shown, and a storage unit constituted from a semiconductor memory, a hard disk drive, and the like. Then, programs to be executed by the arithmetic processing unit, information on the location data storage unit 305, moving information storage unit 306, state-of-move information storage unit 307 and the like, which have been described before, are stored in the storage unit. Functions of the location data receive processing unit 301, moving information calculating unit 302, state-of-move information generating unit 303, and state-of-move information transmit processing unit 304 are implemented by execution of the programs by the arithmetic processing unit.
The base station interface unit 31 is an interface for connecting the information processing unit 30 to the mobile phone base station 2. In this embodiment, the interface may be any interface if it enables transmission and reception of digital information between the information processing unit 30 and the mobile phone base station 2 and matches an interface on the side of the mobile phone base station 2. Accordingly, as the base station interface unit 31, a USB (Universal Serial Bus) interface, for example, can be used. Alternatively, an interface for a communication network using a TCP-IP (Transmission Control Protocol-Internet Protocol) or the like can also be used.
In the case of this embodiment, the location data receive processing unit 301 receives the location data of the mobile phone device 1 sent from the mobile phone base station 2 for each predetermined time such as each 10 seconds, and stores the received location data in the location data storage unit 305. When the fields of the location data P1, . . . and location data Pn are configured to constitute an n-stage stacking structure on this occasion, the latest location data is always stored in the filed of the location data P1. Then, in each of the fields of the location data P2 and the location data that follow, the location data which has been sent earlier (e.g. 10 seconds earlier) than the immediately preceding location data will be stored. Accordingly, when n is set to six, for example, the current location data and the past five pieces of location data will be stored in the location data storage unit 305.
The current speed herein indicates a moving speed of the location data P1 of the mobile phone device 1, or a moved distance per unit time. Accordingly, the current speed can be obtained by dividing a moved distance from the location data P2 to the location data P1 by a time required for the movement, such as 10 seconds.
The maximum speed indicates the maximum moving speed among moving speeds in respective locations in the past. In other words, the maximum speed refers to the maximum one obtained by dividing a moved distance from the location data Pk+1 to the location data Pk (in which k ranges from 2, . . . , and n−1) by a time required for the movement. Alternatively, the maximum speed may be defined to be a value obtained by comparing a value already stored in the region of the maximum speed with the value of the current speed and storing the value of the current speed in the region of the maximum speed when the value of the current speed is larger than the value already stored in the region of the maximum speed.
The moving direction can be defined to be the direction of a vector that goes from the location data P2 to the location data P1. Then, the direction of the vector may be represented by an angle from zero to 360 degrees with the direction of the east (in the direction of an x axis), for example, used as a reference. Alternatively, the angle may be rounded to 16 values, or quantized, and the moving direction may be represented by so-called 16 orientations.
The estimated state refers to the state of a person who is carrying the mobile phone device 1, and at least makes a distinction among a stationary person (who does not move), a pedestrian, and a vehicle passenger. When the current speed and the maximum speed of the person are both 20 m/sec. or less, for example, the person is estimated to be the stationary person. When the maximum speed of the person is 20 to 200 m/sec., for example, the person can be estimated to be the pedestrian even if the current speed of the person is 20 m/min. or less. Further, when the maximum speed of the person is larger than 200 m/min. or larger, for example, the person can be estimated to be the vehicle passenger even if the current speed of the person is 20 m/min. or less, for example.
The location data herein becomes a value obtained by rounding the location data P1 in the location data storage unit 305, or the location data included in a square of predetermined lengths becomes the same location data. Further, the values of the moving speed, the moving direction, and the like are also rounded by predetermined minimum units. Then, assuming that the mobile phone devices 1 with all the corresponding field values thereof rounded as described above being the same are moving substantially in the same manner, these mobile phone devices are brought together as one group. The number of the mobile phone devices 1 brought together as the one group is defined to be the multiplexity. For example, a record in the second column in the information storage unit 307 in
In this embodiment, the information as described above is collected within a predetermined area. That is, the number of stationary persons, pedestrians, vehicle passengers, and the like at respective locations in the predetermined area, or densities of the respective locations are collected. Accordingly, the information stored in the state-of-move information storage unit 307 is the information obtained by unifying the information stored in the location data storage unit 305 and the moving information storage unit 306. These can be said to be the information that indicate location and speed distributions of moving objects such as a pedestrian. Then, these information is referred to as state-of-move information in this specification.
When the state-of-move information is generated in the state-of-move information storage unit 307 as described above, the generated state-of-move information is broadcast to the car navigation system 4 through the mobile phone base station 2 by the state-of-move information transmit processing unit 304.
<Flow of Operations in Overall System>
When the mobile phone devices 1 receive the information requesting the transmission of the location data thereof (at step S12), the mobile phone devices 1 pinpoint (detect) own locations thereof based on electric waves from the GPS satellite 5 (at step S13). Then, the mobile phone devices 1 send pinpointed (detected) location data to the location data collection system 3 through the mobile phone base station 2 (at step S14).
Next, when the location data collection system 3 receives location data sent by the respective mobile phone devices 1 (at step S15), the location data collection system 3 stores the location data in the location data storage unit 305, thereby generating history information of the location data (at step S16). Then, the location data collection system 3 generates respective moving information of the mobile phone devices 1 for the moving information storage unit 306, based on the history information of the location data, and further generates the state-of-move information for the state-of-move information storage unit 307 (at step S17). Then, the location data collection system 3 sends the generated state-of-move information to the car navigation systems 4 through the mobile phone base station 2 (at step S18). Incidentally this transmission is performed from the mobile phone base station 2 to the car navigation systems 4 in the service area thereof in the form of broadcasting.
Then, each of the car navigation systems 4 receives state-of-move information transmitted from the location data collection system 3 (at step S19), and displays the received state-of-move information on a display screen of a display device constituted from an LCD (Liquid Crystal Display) or the like (at step S20). In this case, the state-of-move information or the location distribution, moving speed distribution, and moving direction distribution of the pedestrians and the like are displayed on a map indicating the vicinity of a vehicle including the car navigation system 4. An example of the display will be described later, separately.
In the flow of the information processing described above, the location data collection system 3 sends the information requesting transmission of the location data of the mobile phone devices 1. It may also be so arranged that the location data collection system 3 does not send the information requesting the transmission, and transmission of control information for confirmation of the locations of the mobile phone devices 1 in the predetermined area performed by the mobile phone base station 2 at a predetermined time interval may be substituted for the information requesting the transmission of the location data. However, in this case, when each of the mobile phone devices 1 has received the control information for the confirmation of the locations, each of the mobile phone devices 1 always needs to send back the location data obtained by a GPS electric wave or the like.
Referring to
Next, based on the current speed and the maximum speed obtained as described above, the information processing unit 30 estimates the state of a person who is carrying the mobile phone device 1. When it is found that the current speed and the maximum speed are both smaller than a predetermined value V1 such as 20 m/min. (YES at step S34), the information processing unit 30 determines that the person who is carrying the mobile phone device does not move so much, and therefore estimates that the person who is carrying the mobile phone device is the stationary person (at step S35). When it is found that either the current speed or the maximum speed is the predetermined value or larger (No at step S34), the information processing unit 30 continues another determination that will be described below at step S36.
When it is found that either the current speed or the maximum speed is larger than a predetermined value V2 (provided that the value V2 is larger than the value V1) such as 200 m/min. (Yes at step S36), the information processing unit 30 determines that the person who is carrying the mobile phone device is now traveling or once traveled at a speed equal to or larger than the speed of the pedestrian, and estimates the person who is carrying the mobile phone is the vehicle passenger (at step S38). When it is found that the current speed and the maximum speed are both the predetermined value V2 such as 200 m/min. or less (No at step S36), the information processing unit 30 determines that the person who is carrying the mobile phone is the pedestrian (at step S37). Then, the information processing unit 30 stores the state of the person who is carrying the mobile phone device 1 estimated as described above in the field of the estimated state in the moving information storage unit 306 (at step S39).
First, the information processing unit 30 rounds the value of the location data P1 in the location data storage unit 305 using a predetermined minimum measure (at step S51). Rounding a certain number herein refers to adjusting the number to a nearest figure on a scale in units of the predetermined minimum measure, or quantizing by the number of the minimum measure. Rounding the value of the location data to a multiple of seconds, for example, means rounding the value of the location data to the nearest second. Likewise, 0.5 second or 0.4 second may be used as the minimum measure. When the location data is represented by latitude and longitude, a difference between the one-second length of the latitude and the one-second length of the longitude increases with the latitude. Thus, the minimum measure used for the rounding may differ between the latitude and the longitude.
Next, the information processing unit 30 sorts the records in the location data storage unit 305 based on the value of the rounded location data P1 (at step S52). Then, among the records in the moving information storage unit 306 corresponding to the mobile phone numbers with the same value of the location data P1, the number of the records with all corresponding field values thereof becoming the same is obtained as the multiplexity (at step S53). Then, the value of the rounded location data P1, the values of the respective fields in the moving information storage unit 306 corresponding thereto, and the multiplexity are stored in the state-of-move information storage unit 307 (at step S54).
<Examples of Display in Car Navigation System>
The information in the state-of-move information storage unit 307, generated as described above is sent to the car navigation system 4. Then, the information is displayed on the display screen of the car navigation system 4. An example of display of the state-of-move information in the car navigation system 4 will be described below.
First, it is assumed herein that the state-of-move information sent from the location data collection system 3 is stored in a sate-of-move information storage unit 307′ not shown in the car navigation system 4 in the form of the information in the sate-of-move information storage unit 307 of the location data collection system 3 without alteration. Then, the car navigation system 4 reads records in the sate-of-move information storage unit 307′ one by one, and displays the information thereof on the map. The location data P1 at that point indicates the rounded value. Thus, when its location is displayed on the map that has been enlarged, the location is displayed as a region having a certain width, such as a 5-meter square region. Then, in many cases, a plurality of pedestrians or the like will be included in the 5-meter square region.
When there are four records having the same location data P1 in the sate-of-move information storage unit 307′, and when each of the records represents five pedestrians moving to the north (that indicates the multiplicity of five), one pedestrian at rest, one pedestrian moving to the south, and one pedestrian moving to the east, for example, those information is displayed as shown in
As described above, display of the state-of-move information on a pedestrian or the like at a certain location becomes possible. Then, when display of the pedestrian or the like is performed on the map displayed on the display device of the car navigation system 4 according to the method of display as described above, display as shown in
The car navigation system 4 includes a function of filtering the information recorded in the sate-of-move information storage unit 307′, for display, as well. In the example of display in
Incidentally, the “vehicle” means the vehicle passenger. Accordingly, when only the button of the “vehicle” in
Further, the car navigation system 4 in this embodiment can display even one pedestrian alone. Thus, even in a condition during the night or on a left-curving road or the like, in which a front is difficult to see, presence of the pedestrian can be known in advance. As described above, according to this embodiment, a pedestrian or the like can be visually recognized at the time of driving a vehicle. Thus, the possibility of causing a traffic accident can be reduced.
In the embodiment described above, as shown in FIGS. 2 to 8, the location data collection system 3 performs most of the information processing associated with the location data of the mobile phone device 1, and sends resulting information thereof in the sate-of-move information storage unit 307 to the car navigation system 4. In a first variation example of this embodiment, the most of the information processing is performed by the car navigation system 4. Such a modification is possible because the car navigation system 4 also has an information processing unit including an arithmetic processing unit and a storage unit constituted from a semiconductor memory and a hard disk drive, like the location data collection system 3.
Accordingly, in this case, the location data collection system 3 temporarily stores the location data transmitted from the mobile phone device 1 located in the predetermined area, and executes only the function of broadcasting the temporarily-stored location data of the mobile phone device 1 to the car navigation system 4 through the mobile phone base station 2. The location data to be stored in this case may be the current location data alone, and the past location data does not need to be stored.
As a substitute, the car navigation system 4 needs to include a location data receive processing unit 301′ (corresponding to the location data receive processing unit 301 of the location data collection system 3 shown in
The information in the state-of-move information storage unit 307′ can be generated for the car navigation system 4 in a manner described above. Thus, by performing subsequent processing in manners as described with reference to
In the case of the first variation example in this embodiment, the location data collection system 3 performs only the processing of temporarily storing location data sent from the mobile phone device 1 in the predetermined area. Then, the location data collection system 3 may also be constituted from a block attached to the mobile phone base station 2 rather than constituted from the information processing device including the arithmetic processing unit. In that case, the cost of an overall system can be reduced.
In the original embodiment described above, data of a location pinpointed based on an electric wave from the GPS satellite 5 by the mobile phone device 1 is employed as the location data of the mobile phone device 1. In this case, an error of approximately 10 to 20 meters is sometimes generated in the data of the location pinpointed. Then, in a second variation example of this embodiment, a short-range wireless communication device showing a location thereof is provided on the side of a road or the like along the road for each 10 to 20 meters, for example. The mobile phone device 1 also includes a short-range wireless communication unit capable of communicating with the short-range wireless communication device. By receiving the location data sent from the short-range wireless communication device on the side of the road, the mobile phone device 1 obtains the location data thereof. Incidentally, the mobile phone device 1 at this point may take the location data itself sent from the short-range wireless communication device on the side of the road as the location data of the mobile phone device 1. Location data obtained by correcting the location data according to the strength of the received electric wave may also be used as the location data of the mobile phone device 1. In either case, in the second variation example of this embodiment, the location data of the mobile phone device 1 is obtained by the mobile phone device 1, and the location data thereof is sent to the location data collection system 3 as the digital information.
For the short-range wireless communication device, a Bluetooth access point or an access point of a wireless LAN (Local Area Network) conforming to an IEEE 802.11 standard, or an RFID (Radio Frequency Identification) tag is used. Accordingly, in the case of the second variation example of the present invention, a factor of increasing the cost is included on the side of the mobile phone device 1. However, when an installation interval of the short-range wireless communication device is 10 to 20 meters or less, the accuracy of the data of the location pinpointed by the mobile phone device 1 will be improved in many cases.
In the second variation example of this embodiment, a timing for obtaining the location data by the mobile phone device 1 may be taken when the mobile phone device 1 receives a trigger signal from the short-range wireless communication device installed on the side of the road, rather than when the mobile phone device 1 receives the information requesting transmission of the location data from the location data collection system 3.
In the original embodiment described above, the mobile phone device 1 includes a unit for pinpointing its own location. When the mobile phone device 1 does not include a pinpointing unit, a third variation example of this embodiment provides unit for obtaining the location data of the mobile phone device 1.
In the third variation example of this embodiment, the mobile phone base station 2 includes antennas with directivities in respective directions of the north, south, east, and west, for example. By those antennas, a signal sent from the mobile phone device 1 is received. According to reception levels obtained from the antennas in the respective directions, the location of the mobile phone device 1 is pinpointed. When the reception levels obtained from the antennas in the east and west directions are indicated by Ex (being a positive number in the case of the east direction, and being a negative number in the case of the west direction), and when the reception levels obtained from the antenna in the south and north directions are indicated by Ey (being a positive number in the case of the north direction and being a negative number in the case of the south direction), the direction of the transmission source of the electric wave can be obtained as the direction of a vector (Ex, Ey). Further, the distance thereof can be obtained as a number inversely proportional to the magnitude of the vector (Ex, Ey). In this case, it is assumed that an inverse proportional constant is experimentally obtained in advance. In a manner as described above, the mobile phone base station 2 can obtain the direction in which the mobile phone device 1 is located and the distance of the mobile phone device 1 relative to the location of the mobile phone base station 2, so that the mobile phone base station 2 can calculate the location data of the mobile phone device 1.
In the third variation example of this embodiment, the location data collection system 3 or the mobile phone base station 2 sends (broadcasts) the information requesting transmission of the location data to the mobile phone device 1 located in the predetermined area, as in the original embodiment. The mobile phone device 1 receives the information requesting the transmission and sends predetermined dummy information. By receiving the dummy information, the mobile phone base station 2 measures the reception levels Ex and Ey. The measured reception levels are converted to the digital information by an A/D (Analog/Digital) conversion device or the like, and are output from the mobile phone base station 2 to the location data collection system 3 in the form of the values of the levels Ex and Ey. The location data collection system 3 receives the values of the levels Ex and Ey, and calculates the location data of the mobile phone device 1 based on the received Ex and Ey values. Then, the mobile phone base station 2 stores the calculated location data in the location data storage unit 305.
Incidentally, the error of the location data obtained as described above is sometimes increased. However, a location detecting unit does not need to be included in the mobile phone device 1. Thus, the cost of the mobile phone device 1 can be made to be cheap.
<Supplemental Remarks>
In the embodiment described above, the car navigation system 4 displays the state-or-move information or the information obtained by filtering the state-of-move information as display information (such as image information including a map) on the display device that the car navigation system 4 includes. The car navigation system 4 may output information to a loudspeaker as audio information, for example. However, compared with the display information, the audio information cannot represent a large quantity of information. Accordingly, in this case, the car navigation system 4 further extracts a feature of the state-of-move information or the information obtained by filtering the state-of-move information, such as information on a relationship between the location of the car navigation system 4 and the location of a pedestrian. Then, based on information on the extracted feature, the car navigation system 4 outputs an audio message such as “Several pedestrians are located 100 meters ahead”.
Further, a device for outputting the state-of-move information or the information obtained by filtering the state-of-move information by the car navigation system 4 is not limited to the display device or the loud speaker. Any device that can present at least the feature of the state-of-move information or the information obtained by filtering the state-of-move information to the driver of a vehicle including the car navigation system 4 may be employed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2005-099585 | Mar 2005 | JP | national |
