Abstract:
The invention provides a navigation apparatus wherein necessary traffic information can be acquired without any key operation during running of an automobile. The navigation apparatus includes a positioning device for getting a present position, a map data retrieving device for retrieving map data from a map database, a map display unit for displaying a map, an input device for entering a desired condition to receive information, a memory for storing the entered condition, an access device for accessing to an external information source, and a decision device for deciding a status. The decision device receives information from the external information source through the access device, and the map display unit displays the received information in accordance with map data retrieved by the map data retrieving device if the status matches the condition stored in the memory.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to an information receiving apparatus, a positioning apparatus, a navigation apparatus, an information receiving method, a positioning method and a navigating Method. 
     2. Description of the Related Art 
     An organization which provides traffic information, for example, the ATIS (Advanced Traffic Information Service) is available in Japan. A user can telephone the ATIS to get digital data of traffic congestion information, traffic control information and other information. 
     Some available navigation apparatus for an automobile are compatible with the ATIS. In a navigation apparatus of the type compatible with the ATIS, if, for example, key operations 
     (1) to establish an ATIS mode, 
     (2) to establish a communication mode, 
     (3) to set, in route guidance, a present position, a destination and so forth, and 
     (4) to telephone the ATIS are performed, then, for example, an optimum route considering current traffic congestion situation can be found from among several routes from the present position of the automobile to the desired destination and displayed on a display unit. 
     However, such key operations of those operations (1) to (4) described above are cumbersome. Therefore, taking also safety into consideration, most navigation apparatus are so constructed that those operations are disabled while the automobile is running. Even if a navigation apparatus is not constructed as such, it still is undesirable to perform key operations during running of an automobile from the point of view of safety. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a navigation apparatus and a navigating method wherein necessary traffic information can be acquired without any key operation during running of an automobile. 
     It is another object of the present invention to provide an information receiving apparatus, a positioning apparatus, an information receiving method and a positioning method suitable for use with such navigation apparatus and navigation method as mentioned above. 
     In order to attain the objects described above, according to an aspect of the present invention, there is provided a navigation apparatus with a data receiving operation function, including positioning means for getting a present position, map data retrieving means for retrieving map data from a map database, map display means for displaying a map, input means for entering a desired condition to receive information, memory means for storing the condition, access means for accessing to an external information source, and decision means for deciding a status, wherein the decision means receives information from the external information source through the access means and the map display means displays the received information in accordance with map data retrieved by the map data retrieving means if the status matches the condition stored in the memory means. 
     In the navigation apparatus, a navigating method with an automatic operation feature is performed which includes the inputting step of entering a desired condition to receive information, the storing step of storing the entered condition, the positioning step of getting a present position, the map data retrieving step of retrieving map data from a map database, and the deciding step of deciding a status, wherein the deciding step receives information from the external information source through radio communication means and displays the received information in accordance with map data retrieved in the map data retrieving step if the status matches the condition stored in the storing step. 
     With the navigation apparatus and the navigating method, for example, when the automobile starts, the necessary traffic information is available already, and a navigation display can be obtained in a latest traffic situation. Further, traffic information can be obtained automatically midway of a route to a destination, and a navigation display can still be performed in a latest traffic situation. Further, since cumbersome key operations need not be performed during running of the automobile, safety is assured. Further, there is no need of having a fellow passenger manually operate the navigation apparatus. 
     According to the present invention, an information receiving apparatus, a positioning apparatus, an information receiving method and a positioning method suitable for use with the navigation apparatus and navigation method are provided. 
     In particular, according to another aspect of the present invention, there is provided an information receiving apparatus with an automatic operation function, which includes input means for entering a desired condition to receive information, memory means for storing the entered condition, access means for accessing to an external information source, and decision means for deciding a status, wherein the decision means receives information from the external information source through the access means if the status matches the condition stored in the memory means. 
     In the information receiving apparatus, an information receiving method with an automatic operation feature is performed which includes the inputting step of entering a desired condition to receive information, the storing step of storing the entered condition, and the deciding step of deciding a status, wherein the deciding step receives information from the external information source through radio communication means and displays the received information if the status matches the condition stored in the storing step. 
     According to a further aspect of the present invention, there is provided a positioning apparatus with a data receiving operation function, which includes positioning means for getting a present position, input means for entering a desired condition to receive information, memory means for storing the entered condition, access means for accessing to an external information source, and decision means for deciding a status, wherein the decision means receives information from the external information source through the access means if the status matches the condition stored in the memory means. 
     In the positioning apparatus, a positioning method with an automatic operation feature is performed which includes the inputting step of entering a desired condition to receive information, the storing step of storing the entered condition, the positioning step of getting a present position, and the deciding step of deciding a status, wherein the deciding step receives information from the external information source through radio communication means and displays the received information if the status matches the condition stored in the storing step. 
     The above and other objects, features and advantages of the present invention will become apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a block diagram of a navigation apparatus showing a preferred embodiment of the present invention; and 
     FIGS. 2 and 3 are flow charts illustrating operation of the navigation apparatus of FIG.  1 . 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIG. 1 shows a preferred embodiment of the present invention applied to a vehicle-carried navigation apparatus. Referring to FIG. 1, a radio wave from a navigation satellite, for example, a GPS satellite, is received by a GPS antenna  11  of the navigation apparatus, and the received signal is supplied to a GPS unit (receiving circuit)  12 . Data of a position of an automobile on which the navigation apparatus is carried, a moving speed of the automobile and so forth are outputted from the GPS unit  12  and supplied to a microcomputer  20 . 
     The navigation apparatus further includes a self-contained navigation unit such as, for example, a gyroscope  13 , from which data of a moving speed of the navigation apparatus are outputted. The data are supplied to the microcomputer  20 . The navigation apparatus further includes a vehicle speed sensor  14  for detecting a running speed of the automobile, and an output signal of the vehicle speed sensor  14  is supplied to the microcomputer  20 . 
     The navigation apparatus further includes a drive unit  15  for a CD-ROM (compact disk ROM (read only memory)). A CD-ROM  50  which is read by the drive unit  15  has written in advance therein various data necessary for navigation such as, for example, image data to be used to display a map. The data of the CD-ROM  50  are read out by the drive unit  15  and supplied to the microcomputer  20 . 
     Further connected to the microcomputer  20  are a clock circuit  16  for counting the present time and, for example, a color LCD (liquid crystal display)  17  as a display unit. 
     Further, a modem  18  as means for accessing to an organization which provides traffic information is connected to the microcomputer  20 , and a mobile telephone set, for example, a portable telephone set  80 , is connected to the modem  18 . 
     Since the number of operation keys which can be provided on a panel face of a vehicle-carried apparatus is limited, the navigation apparatus of FIG. 1 is constructed such that various operations can be performed by remote control (remote operation). 
     To this end, a reception circuit  19  for a remote control signal, for example, of infrared rays is connected to the microcomputer  20  such that, if one of operation keys  91  of a transmitter  90  of a remote controller is manually operated, then an infrared ray signal having data corresponding to the operated key is outputted from the transmitter  90 . The infrared ray signal is received by the reception circuit  19 , and the data of the operated key is supplied to the microcomputer  20 . 
     The microcomputer  20  includes a CPU (central processing unit)  21 , a ROM  22  in which a program is written, a RAM (random access memory)  23  for a working area, and a memory  24  for storing data. 
     The ROM  22  includes, as part of the program written therein, for example, a setting routine  100  and an access routine  200  illustrated in FIGS. 2 and 3, respectively. Details of the routines  100  and  200  will be hereinafter described. 
     The microcomputer  20  has a port (interface circuit)  25  for inputting and outputting data therethrough and a display controller  26 . Display data from the CPU  21  are converted into a display signal by the display controller  26  and supplied to the color LCD  17  so that an image of a map or the like corresponding to the data supplied to the display controller  26  is displayed on the color LCD  17 . 
     In the navigation apparatus having the construction described above, when the ATIS is to be accessed, a user will manually operate a setting key from among the operation keys  91  of the transmitter  90  before the user starts driving of the automobile. 
     In response to the manual operation of the setting key, the navigation apparatus puts itself into a setting key mode, in which the process of the CPU  21  of the microcomputer  20  starts from step  101  of the setting routine  100 . Then, in step  102 , the CPU  21  puts itself into a key input waiting state. The key input waiting state is provided for the user to select a utilization method of the ATIS and allows designation of one of the following choices (1) and (2): 
     (1) To access the ATIS when a certain point of time set in advance comes. 
     This may be designated, for example, in such a case that, as the user is planned to drive at xx o&#39;clock tomorrow, the user wants to utilize latest data of the ATIS then. 
     (2) To access to the ATIS if the automobile passes or arrives at a certain place or location set in advance. 
     This may be designated, for example, in such a case that the user wants to know, after the automobile reaches xx, an uncrowded road ahead xx together with a route. Thus, the CPU  21  waits for a key inputting operation for selection of one of the two choices. 
     Then, if a key inputting operation to designate the choice (1) or (2) is performed, then the process advances to step  103 , in which the key input in step  102  is discriminated. If it is discriminated that the choice (1) has been selected, then the process advances from step  103  to step  104 . Then, in step  104 , the CPU  21  puts itself into a waiting state for the point of time of the choice (1), and if the point of time is inputted, then the process advances to step  111 . 
     On the other hand, when it is discriminated in step  103  that the key input in step  102  is the choice (2), the process advances from step  103  to step  105 . Then, in step  105 , the CPU  21  puts itself into a waiting state for the place of or location choice (2), and if the place is inputted, then the process advances to step  111 . 
     Then, after the process advances to step  111  whichever one of the choices (1) and (2) has been selected, the CPU  21  puts itself into a waiting state for a next key inputting operation in step  111 . This key input waiting state is provided for the user to select a displaying method, and it continues until one of two following choices (A) and (B) is designated: 
     (A) To display a route from the present position to the destination. 
     For example, a map is displayed, and from among various roads to the destination, those roads which provide an optimum route are indicated by painting up them with green. 
     (B) To display congestion situations of roads, traffic control information and so forth. 
     For example, a map is displayed, and from among roads around the present place, a congested road or roads are indicated by painting up them with red. The CPU  21  thus waits for a key inputting operation to select one of the choices (A) and (B). 
     If a key inputting operation to designate one of the two choices (A) and (B) is performed, then the process advances to step  112 , in which the key input in step  111  is discriminated. If it is discriminated that the choice (A) has been selected, then the process advances from step  112  to step  113 . Then, in step  113 , the CPU  21  waits for an inputting operation for the present position (or start position) and the destination necessary for display of the choice (A), and if they are inputted, then the control sequence advances to step  114 , in which the setting routine  100  is ended. 
     On the other hand, if it is discriminated in step  112  that the key input in step  111  is the choice (B), the process skips step  113  and advances directly to step  114 , in which the setting routine  100  is ended. 
     In this manner, the choice (1) or (2) and the choice (A) or (B) are set in the setting routine  100  in advance. It is to be noted that, upon such setting, those data which must be stored are written into and stored in the memory  24 . 
     On the other hand, when the automobile is running or in use, of the data of the maps stored on the CD-ROM  50 , those corresponding to the present position are read out in accordance with output signals of the GPS unit  12 , the gyroscope  13  and the vehicle speed sensor  14 , and a map including the present position is displayed on the color LCD  17  in accordance with the read out data. Further, on the map, the present position and the advancing direction of the automobile and so forth are displayed in accordance with the output signals of the GPS unit  12 , the gyroscope  13  and the vehicle speed sensor  14 . 
     Then, while such processing and displaying as described above are performed, the access routine  200  is executed by an interrupt, for example, for each one second, and the display of an image is corrected or worked for the result of setting of the setting routine  100 . 
     In particular, in the access routine  200 , the process of the CPU  21  starts from step  201 , and in next step  202 , it is discriminated whether or not the present point of time or the present place corresponds to the point of time of the choice (1) set in step  104  or the place or location of the choice (2) set in step  105 . 
     Then, if the present point of time or the present place does not correspond to the point of time of the choice (1) or the place of the choice (2), then the process advances from step  202  to step  215 , in which the access routine  200  is ended. Accordingly, when the present point of time or the present place does not correspond to the point of time of the choice (1) or the place of the choice (2), nothing is executed. Consequently, the display of the color LCD  17  is similar to a display of an ordinary navigation apparatus. 
     However, when the present point of time or the present place corresponds to the point of time of the choice (1) or the place of the choice (2) in step  202 , the process advances from step  202  to step  211 , in which a call to the ATIS is originated from the portable telephone set  80  and the microcomputer  20  is connected to the ATIS through the modem  18  and the portable telephone set  80 . 
     After the microcomputer  20  is connected to the ATIS, the process advances to step  212 , in which a request for data of traffic information is developed based on the data stored in the memory  24 , that is, the data inputted in the setting routine  100 . As a result, the object data of traffic information are transmitted from the ATIS to the navigation apparatus. After reception of the data transmitted thereto is completed, the process advances to step  213 , in which ring-off processing of the portable telephone set  80  is performed. 
     Then, after the portable telephone set  80  is disconnected as a result of the ring-off processing, the process advances to step  214 , in which the display of the color LCD  17  is corrected or worked based on the data of traffic information received in step  212  in accordance with the condition of the choice (A) or (b) set in the setting routine  100 . Then, in step  215 , the access routine  200  is ended. 
     Accordingly, with the access routine  200 , when the time or the place of the condition set in the setting routine  100  is reached, latest navigation information is displayed on the color LCD  17 . 
     In this manner, with the navigation apparatus described above, information can be obtained from the ATIS. In this instance, since data necessary to obtain object traffic information can be inputted before the automobile is used, for example, when the automobile starts, the necessary traffic information is available already, and a navigation display can be obtained in a latest traffic situation. Further, traffic information in midway of a route to a destination can be obtained automatically, and a navigation display can still be performed in a latest traffic situation. 
     Further, since cumbersome key operations need not be performed during running of the automobile, the safety is assured. Further, there is no need of making a fellow passenger manually operate the navigation apparatus. 
     Having now fully described the invention, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the spirit and scope of the invention as set forth herein.