JP2006226956A - Navigation system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation system for a vehicle capable of avoiding troublesome feeling felt in a voice guide when traveling in an area known well by a user. <P>SOLUTION: This navigation system for the vehicle has a position detecting means for detecting the present position of the vehicle; a destination setting means for setting a destination; a route searching means for searching a guide route from the present position up to the destination; a voice guide means for guiding the guide route by a voice; a computing means for computing a distance from the present position up to the destination; and a voice guide limiting means for limiting the guide by the voice in response to reduction of the computed distance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is mounted and used in a vehicle, and has a function of performing voice guidance on a set route to a vehicle occupant to guide the vehicle along the set route. It is about.

  As the vehicle travels, the current position is detected by GPS (Global Positioning System), etc., and the current position is displayed on the display device together with the road map, and an appropriate route from the current position to the destination is displayed. A vehicle navigation device that is set and guided by a display device, an audio output device, or the like contributes to efficient and safe driving for the driver.

  Conventionally, in a navigation device for a vehicle, in a navigation device that performs route guidance, when searching for a route from a departure point to a destination point and guiding along the searched route, attention points such as an intersection that makes a right or left turn Guidance is provided by voice and display. For example, voice guidance is performed a plurality of times, such as 700 m before the intersection, 300 m before, and immediately before the intersection, so that the driver can make a right or left turn more reliably by notifying the facility as a landmark. First, inform the operator that "Turn right 700m," then notify "Turn right 300m," then immediately before the right turn, "Take a right turn soon. Is sure to be able to turn right.

  However, when performing route guidance, if there is a road that the user knows well in part of the route to the destination, the road can be advanced without detailed guidance. However, in the conventional navigation device, since the same guidance is performed on all roads, the guidance may be troublesome. There are some routes that do not provide guidance except for the route from the current position to the starting point of the guide route or from the end point of the guide route to the final destination point. The same guidance is provided on the road.

  Therefore, the voice guidance according to the set route performed by the voice guidance unit has the first content when the number of past passes on the set route of the vehicle is equal to or less than the predetermined number of times, and the vehicle When the number of past passages on the set route exceeds a predetermined number, a vehicle navigation apparatus having a second content simplified from the first content has been devised (see Patent Document 1). .

  Further, a vehicle navigation device has been devised in which the frequency of intersection guidance by voice can be arbitrarily changed and set according to the driver's will or according to the driving environment (see Patent Document 2).

  Also, determine whether each road is a target road for simplified guidance, simplify the voice guidance output of the road determined to be a target road for simplified guidance, or drive a certain number of times A vehicle navigation device that simplifies voice guidance on roads has been devised (see Patent Document 3).

Japanese Patent Laid-Open No. 11-201767 JP 2001-280990 A JP 2003-57059 A

  In the example of Patent Document 1, it is necessary to prepare a message for voice guidance corresponding to each condition such as normal time or simplified time. For this reason, a corresponding storage area is required, which increases the manufacturing cost. In addition, it is necessary to set a threshold value for the number of past runs, which increases the burden on the user.

  In the example of Patent Document 2, the content of the voice guidance is changed depending on the driving environment such as day and night, weather, degree of traffic congestion, vehicle speed, the number of intersections on the route, etc. However, there is a problem that it feels bothersome.

  Furthermore, the example of Patent Document 3 has a problem of increasing the burden on the user of setting simplification because the object of simplification of voice guidance is a road unit.

  With the above problem as a background, an object of the present invention is to provide a vehicle navigation device that avoids annoying voice guidance when traveling in an area that a user knows well.

Means for Solving the Problems and Effects of the Invention

  The present invention provides a vehicle navigation apparatus for solving the above-described problems. That is, according to claim 1, position detecting means for detecting the current position of the vehicle, destination setting means for setting the destination, and route searching means for searching for a guide route from the current position to the destination. Voice guidance means for performing voice guidance on the guidance route, calculation means for calculating the distance between the current position and the destination, voice guidance restriction means for limiting voice guidance according to a decrease in the calculated distance, Are configured as a vehicle navigation device.

  The present invention pays attention to the fact that it is not necessary to provide detailed voice guidance in areas where the user knows the road conditions well, such as around the home. For example, when the home is set as the destination, the current position and the destination are The voice guidance is restricted according to the decrease in the distance from a certain home. With the above configuration, it is possible to avoid that the user feels annoying the voice guidance.

  In the configuration of the present invention, it is not necessary to prepare a voice guidance message according to each condition unlike the prior art, so that the manufacturing cost does not increase. In addition, it is not necessary to set a threshold for the number of past runs, and the burden on the user does not increase. In addition, since it is not configured to change depending on the driving environment such as day and night, weather, degree of traffic congestion, vehicle speed, number of intersections on the route, etc., it can be executed by simple control processing, so that the development cost of the control program can be reduced. Furthermore, since the target of the voice guidance is not a road unit and it is not necessary to select a road, it is possible to limit the voice guidance without increasing the burden on the user.

  According to the second aspect of the present invention, the vehicle navigation device includes distance determination means for determining whether the calculated distance is less than a predetermined value, and the voice guidance restriction means has the calculated distance determined to be predetermined. A configuration in which voice guidance is limited when it is determined that the value is lower than the value may be adopted. With this configuration, for example, voice guidance is restricted within a predetermined distance range around the destination that is well known to the user, such as near the home, so that it is possible to avoid the driver from feeling annoying the voice guidance. Is possible.

  According to the third aspect of the present invention, the vehicle navigation device includes a point determination unit that determines whether or not the current position is at a point where voice guidance is performed, and the calculation unit performs voice guidance for the current position. It can also be configured to calculate the distance between the current position and the destination when it is determined that it is at the point to be performed. Also with this configuration, since the voice guidance is limited within a predetermined distance range around the destination that the user knows well, it is possible to avoid the user from feeling annoying the voice guidance.

  According to the fourth aspect, the voice guidance restriction means in the vehicle navigation device of the present invention can be configured to reduce the number of times of voice guidance. In the conventional vehicle navigation apparatus, when the distance to the point where the voice guidance such as the destination is performed becomes 700 m, 300 m, and 100 m, for example, the voice guidance is performed three times in total. With this configuration, for example, if “speech guidance is not performed at a point within 200 m from the destination” is set, voice guidance is not performed when the distance to the destination reaches 100 m. It becomes voice guidance, and it can be avoided that the user feels the voice guidance troublesome.

  According to the fifth aspect, the voice guidance restricting means in the vehicle navigation apparatus of the present invention can be configured not to provide guidance for a point where voice guidance is performed. With this configuration, it is possible to eliminate the voice guidance around the destination that the driver knows well, and it is possible to avoid the driver feeling annoying the voice guidance.

  According to the sixth aspect of the present invention, the vehicular navigation apparatus of the present invention can also be configured to include a selection operation means that allows the user to select whether or not to restrict guidance by voice. With this configuration, it is possible to individually select whether or not to perform voice guidance around the destination, which is well known by the driver, and it is possible to perform detailed voice guidance. In addition, it is possible to restrict voice guidance around the destination that the driver knows well, and it is possible to avoid the driver from feeling annoying the voice guidance.

  According to the seventh aspect of the present invention, the vehicle navigation apparatus of the present invention can also be configured to include a voice guidance restriction mode setting unit that allows the user to set a voice guidance restriction mode. In addition to the guidance information to the destination, the voice guidance may include weather information, traffic information, and facility information around the guidance route. With this configuration, the user can hear the voice guidance about the desired content even if the user travels around the destination and is in the voice guidance restricted state.

  According to the eighth aspect of the present invention, the vehicle navigation apparatus of the present invention includes destination storage means for instructing and storing the destination on the electronic map, home setting as a type for storing the destination, and other memory points. When the home is set as the destination, the distance between the home and the current position where the restriction of voice guidance starts is larger than the distance when the memory point is set as the destination If the destination is set at home and the destination is at the memory point, the voice guidance restriction may be started at an earlier stage. The user is familiar with the geographical situation around the house or the road situation. With this configuration, it is possible to avoid that the driver feels annoying the voice guidance while traveling around the home. In addition, it is possible to perform detailed audio guidance at a memory point where the geographical situation is less clear than in the vicinity of the house.

  According to the ninth aspect, the vehicle navigation device of the present invention has the restriction release operation means for temporarily releasing the restriction of the voice guidance from the current position in a situation where the voice guidance is restricted. However, when the restriction release operation is performed, it is possible to adopt a configuration in which guidance by voice that should be restricted originally is performed. With this configuration, when the user's memory about the destination is ambiguous, for example, when the passenger wants to hear voice guidance, or when a person other than the normal user is acting on behalf of the driver, normal voice guidance is provided. It is possible to reach the destination without departing from the guide route.

  For the purpose of providing a vehicle navigation device that avoids annoying voice guidance when traveling in an area that is well known by the user, when the distance between the current position and the destination is less than a predetermined distance, voice guidance This is realized by a vehicle navigation device that reduces the number of times.

  Hereinafter, a vehicle navigation apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an overall configuration of a vehicle navigation apparatus (hereinafter abbreviated as a navigation apparatus) 100. The navigation device 100 includes a position detector 1, a map data input device 6, an operation switch group 7, a remote control (hereinafter referred to as “remote control”) sensor 11, a voice synthesis circuit 24 for performing voice guidance, a speaker 15, a semiconductor memory device 9, A display device 10, a hard disk device (HDD) 21, a control circuit 8 connected thereto, and a remote control terminal 12 are provided.

  A position detector 1 as position detection means of the present invention includes a known geomagnetic sensor 2, a gyroscope 3, a distance sensor 4, and a GPS receiver 5 for GPS that detects the position of a vehicle based on radio waves from a satellite. have. Since these sensors 2, 3, 4, and 5 have errors of different properties, they are configured to be used while being complemented by a plurality of sensors. Depending on the accuracy, a part of the sensors described above may be used, and further, a steering rotation sensor, a wheel sensor of each rolling wheel, or the like may be used.

  The map data input device 6 is a device for inputting various data including so-called map matching data for improving the accuracy of position detection and road data representing road connections from the storage medium 20. As a storage medium, a CD-ROM or DVD is generally used because of the amount of data, but another medium such as a memory card may be used.

  The map data stores predetermined map image information for display and road network information including link information and node information. The link information is predetermined section information constituting each road, and includes position coordinates, distance, required time, road width, number of lanes, speed limit, and the like. The node information is information that defines an intersection (branch road) and the like, and includes position coordinates, the number of right / left turn lanes, a connection destination road link, and the like. In addition, data indicating whether or not traffic is possible is set in the inter-link connection information.

  As the operation switch group 7, for example, a touch switch or a mechanical switch integrated with the display device 10 is used. The touch switch includes an infrared sensor finely arranged in the vertical and horizontal directions on the screen of the display device 10, a panel portion that converts a finger contact detected by the infrared sensor into an electrical signal, and a signal processing circuit for sending the electrical signal to an external device. And a controller for controlling them. For example, when the infrared ray is blocked with a finger or a touch pen, the blocked position is detected as a two-dimensional coordinate value (X, Y). As a touch switch, an electrical circuit is wired in the X-axis direction and Y-axis direction through a gap called a spacer on a glass substrate and a transparent film, and when the user touches the film, the wiring of the pressed part is short-circuited. Therefore, a so-called resistive film method may be used in which this is detected as a two-dimensional coordinate value (X, Y). Alternatively, a so-called capacitance method may be used in which a substance that receives an electrical signal is applied to a glass surface of a transparent conductive substrate, and a change in capacitance is detected by a sensor as an electrical signal when a finger is brought close to the glass surface. Good.

  In addition to the touch switch, a pointing device such as a mouse or a cursor may be used. It is also possible to input various instructions using the voice recognition unit 30. In this method, when a voice is input from a microphone 31 connected to the voice recognition unit 30, the voice signal is subjected to voice recognition processing by a known voice recognition technique, and converted into an operation command corresponding to the result. . The voice recognition unit 30 amplifies the voice signal input from the microphone 31 to an appropriate level, A / D-converts the amplified voice signal, and then uses a known voice recognition algorithm such as a hidden Markov model. An audio signal processing device (DSP: Digital Signal Processor) for identifying, a memory or the like in which reference data for identifying audio is stored, and the DSP converts the audio signal into numerical information corresponding to the audio. After being converted, it is sent to the control circuit 8. Various instructions can be input by the operation switch group 7, the remote control terminal 12, the voice recognition unit 30, and the microphone 31. The operation switch group 7, the remote control terminal 12, the voice recognition unit 30, and the microphone 31 correspond to destination setting means, selection operation means, voice guidance restriction mode setting means, and restriction release operation means of the present invention.

  The transceiver 13 is a device for receiving road traffic information from, for example, a VICS (Vehicle Information and Communication System) center 14.

  Further, by connecting a mobile communication device such as a mobile phone 17 or a car phone to the communication unit 19, connection to an external network is possible and connection to the Internet or the like is possible. Furthermore, by communicating with an ETC (Automatic Toll Collection System, ETC: Electronic Toll Collection) vehicle-mounted device 16, fee information received by the ETC vehicle-mounted device 16 from the ETC road device can be taken into the navigation device 100. Moreover, it is also possible to connect with an external network by the ETC onboard equipment 16. A configuration for communicating with the VICS center 14 via the cellular phone 17 or the ETC vehicle-mounted device 16 may be adopted.

  The control circuit 8 according to the present invention is configured as a normal computer, and includes a well-known CPU 81, ROM 82, RAM 83, I / O 84 which is an input / output circuit, and a bus line 85 which connects these configurations. The CPU 81 controls the navigation program 21p and data stored in the HDD 21. The CPU 81 controls the reading / writing of data to / from the HDD 21.

  The A / D conversion unit 86 includes a well-known A / D (analog / digital) conversion circuit, and converts analog data input from the position detector 1 or the like to the control circuit 8 into digital data that can be calculated by the CPU 81, for example. It is.

  The HDD 21 may be configured to store map data. In addition, the user can independently write data to the HDD 21 in addition to auxiliary information for route guidance, entertainment information, and the like. The contents of these data can be rewritten by operating the operation switch group 7 and the remote control terminal 12 or by inputting voice from the microphone 31. It is also possible to read the map data from the storage medium 20 using the map data input device 6 and update the contents of the HDD 21. Moreover, the structure which records the data received via in-vehicle LAN (Local Area Network) 22 which exchanges data between the other control apparatuses in a vehicle may be taken.

  The semiconductor storage device 9 which is the destination storage means of the present invention is constituted by a rewritable semiconductor memory such as a flash memory, and stores information and data necessary for the operation of the navigation device 100. The semiconductor storage device 9 is configured to retain the stored contents even when the accessory switch of the vehicle is turned off (that is, the navigation device 100 is turned off).

  Further, information and data necessary for the operation of the navigation device 100 may be stored in the HDD 21 instead of the semiconductor memory device 9. Further, information and data necessary for the operation of the navigation device 100 may be stored separately in the semiconductor storage device 9 and the HDD 21. In this case, since the access speed to the semiconductor storage device 9 is higher than that of the HDD 21, a relatively frequent read / write frequency is stored in the semiconductor storage device 9, and a relatively low read / write frequency is stored in the HDD 21. Good. The contents stored in the semiconductor memory device 9 may be backed up and saved in the HDD 21.

  The display device 10 is a known color liquid crystal display, and includes, for example, a dot matrix LCD (Liquid Crystal Display) and a driver circuit for performing LCD display control. The driver circuit uses, for example, an active matrix driving method in which a transistor is attached to each pixel so that the target pixel can be reliably turned on and off, and is based on display instructions and display screen data sent from the control circuit 8. To display. On the screen of the display device 10, the vehicle current position mark input from the position detector 1, the map data input from the storage medium 20, and additional data such as a guide route displayed on the map are displayed in a superimposed manner. At the same time, a menu button for setting route guidance, guidance during route guidance, and a screen switching operation is displayed on this screen.

  The speaker 15 is connected to a well-known voice synthesis circuit 24 connected to the I / O 34 of the control circuit 8, and the digital voice data stored in the semiconductor storage device 9 or the HDD 21 is analogized in the voice synthesis circuit 24 according to a command from the navigation program 21 p. The sound converted is sent out. In addition, the speech synthesis method stores the speech waveform as it is or after encoding it, recording and editing methods that connect them as necessary, and analyzes the speech waveform and stores it in the form converted into parameters. There are a parameter editing system for generating speech by connecting speech synthesis circuits by connecting them, a rule synthesis system for generating speech from character strings or phoneme symbol strings based on phonetic and linguistic rules, and the like. The speaker 15 and the voice synthesizing circuit 24 correspond to the voice guidance means of the present invention.

  The vehicle speed sensor 23 includes a rotation detection unit such as a known rotary encoder. For example, the vehicle speed sensor 23 is installed in the vicinity of the wheel mounting unit to detect the rotation of the wheel and send it to the control circuit 8 as a pulse signal. The control circuit 8 converts the number of rotations of the wheel into the speed of the vehicle, calculates the current position of the vehicle and the expected arrival time to a predetermined location, and calculates the average vehicle speed for each travel section of the vehicle. A method of acquiring vehicle speed data from other in-vehicle devices via an in-vehicle LAN (Local Area Network) 22 may be used.

  The external data input / output device 26 includes, for example, an input / output circuit and a connector for connecting to a removable external storage device. At least a part of the contents stored in the semiconductor storage device 9 or the HDD 21 can be stored as backup data in a magneto-optical disk or the like via an external storage device.

  With this configuration, when the navigation program 21 p is activated by the CPU 81 of the control circuit 8, the navigation device 100 is operated by the driver operating the operation switch group 7 or the remote control terminal 12 or inputting voice from the microphone 31. When the route guidance process for displaying the destination route on the display device 10 is selected from the menu displayed on the display device 10, the following processing is performed.

  That is, when the driver inputs the destination based on the map on the display device 10, the current position of the vehicle is obtained based on the satellite data obtained from the GPS receiver 5, and the optimum position from the current position to the destination is determined. Processing for obtaining a guidance route is performed. Then, the guide route is displayed on the road map on the display device 10 so as to guide the driver to the appropriate route. As a method for automatically setting an optimum guide route, a method such as the Dijkstra method is known. In addition, at least one of the display device 10 and the speaker 15 provides a notification according to the guidance during operation or the operation state.

  As described above, when the user inputs the position of the destination by the operation switch group 7, the remote control terminal 12 or the voice recognition unit 30, the navigation device 100 forms a guide route from the current location to the destination and displays on the display device 10. Display on the screen. At the same time, it is set as a guidance target point for causing the user to travel along the route at a branch point such as an intersection on the route. The control circuit 8 determines a guidance execution point as a point to be guided by voice when the vehicle approaches a certain distance with respect to the set guidance target point. For example, when the guidance target point is an intersection, a plurality of guidance execution points can be set such as 700 m before, 300 m before, 100 m before on a general road, 2 km, 1 km, 500 m before on an expressway.

  The voice guidance restriction process of the present invention will be described with reference to the flowchart of FIG. This process is included in the navigation program 21p executed by the CPU 81, and is repeatedly executed together with other processes of the navigation program 21p.

  First, it is determined whether or not the current position of the vehicle is at a position that matches the voice guidance end condition. If the current position of the vehicle is at a position that matches the guidance end condition (S1: YES), the process ends without doing anything. That is, voice guidance is not performed.

The guidance termination conditions include the following, and at least one is used. Also, which one is used can be set by the user.
(1) Route guidance is not performed.
(2) The user is set not to perform voice guidance.
(3) There is no need to give voice guidance upon arrival at the destination.

  On the other hand, when the current position of the vehicle is not in a position that matches the voice guidance end condition (S1: NO), the guidance execution point where the current position of the vehicle and the distance to the destination are obtained and the current position of the vehicle provides voice guidance. That is, it is checked whether the vehicle is at the guidance point. If the vehicle is at the guidance point (S2: YES), it is checked whether the destination of the vehicle matches the guide frequency limit condition.

The guide frequency limiting conditions include the following, which can be set by the user.
(1) A point registered as a home.
(2) A point registered as a memory point and a point that has traveled a plurality of times.
(3) A point set by the user as a guide number limit as an attribute of the memory point.
(4) A point set by the user as a guide frequency limit for a newly set destination.

  When the destination meets the guide count limit condition (S3: YES), the distance between the current position of the vehicle and the destination is calculated, and whether the distance is below the guide count limit distance set as a predetermined value. Investigate. As a result, when the distance is less than the guidance number limit distance (S4: YES), referring to the guidance restriction condition, it is determined that voice guidance at the guidance point may be performed (S5: YES). The control circuit 8 sends voice data stored in a predetermined area of the semiconductor storage device 9 or the HDD 21 together with a guidance command to the voice synthesis circuit 24. The voice synthesis circuit 24 performs digital / analog conversion on the voice data and outputs it from the speaker 15 (S6).

  In the flow chart of FIG. 2, the process returns to step S1 after the voice guidance is output, but does not mean an infinite loop process, but can be configured to execute other periodic processes and interrupt processes included in the navigation program 21p. Yes.

  As an example of restricting the number of times of voice guidance, when the distance between the current location and the home becomes 2 km or less, the right / left turn guidance that is usually performed three times is made once, or is usually performed when the vicinity of the destination is reached. , “Near the destination. Voice guidance will be terminated.”

The guidance restriction conditions include the following, and at least one is used. Also, which one is used can be set by the user.
(1) As a general rule, voice guidance is normally performed three times for all guidance points such as intersections, but is set so that voice guidance is performed only once for previously designated guidance points. .
(2) It is set so that voice guidance is performed only at special guidance points such as intersections without signals and complex intersections.
(3) The voice guidance is set not to be performed when the guide frequency limit condition is met.
(4) It is set so that voice guidance is performed only at dangerous points such as intersections where there are many accidents. It is assumed that whether or not the point is a dangerous point is stored in the map data of the storage medium 20.
(5) It is set to limit warnings by voice such as warnings before the curve and warnings before the crossing. It should be noted that whether or not it is a warning execution point is stored in the map data of the storage medium 20.

  The guidance number limit distance is stored in advance in a predetermined area of the semiconductor storage device 9 or the HDD 21 of the vehicle navigation device 100, but can be changed by the user. It is also possible to set a guide frequency limit distance for each point. For example, a guidance frequency limit distance is set large near the home where the driving frequency is high, and a guidance frequency limit distance is set small at a point where the driving frequency is low.

  Even when the voice guidance restriction process is being performed, if the user feels that guidance is necessary due to forgetting the route or the like, the voice guidance reduction process is performed by operating the operation switch group 7 or the remote control terminal 12, or by voice input from the microphone 31. It may be configured to cancel and perform normal voice guidance. When the user fully understands the situation near the destination during normal voice guidance, voice guidance restriction processing is performed by operating the operation switch group 7 or the remote control terminal 12 or by voice input from the microphone 31. You may take the structure which makes it possible.

  In addition to the embodiment shown in the flowchart of FIG. 2, first, the distance between the current position of the vehicle and the destination is obtained, and it is checked whether or not the distance is less than a guidance number limit distance set as a predetermined value. If the distance is not less than the limit distance, the process may return to step S1. That is, processing is performed in the order of step S1: NO → step S4 → step S2 → step S3 → step S5.

  In the above embodiment, various settings by the user are performed as follows. When the user operates the operation switch group 7 or the remote control terminal 12 or inputs a voice from the microphone 31, the function setting menu is displayed on the display device 10 from the menu displayed on the display device 10, and the voice guidance is restricted from the menu. Select and display the setting screen. Then, each item is selected and set. The selected / set contents are stored in a predetermined area of the semiconductor memory device 9 or the HDD 21.

  Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these embodiments, and the knowledge of those skilled in the art can be used without departing from the spirit of the claims. Various modifications based on this are possible.

The block diagram which shows the structure of a navigation apparatus. The flowchart for demonstrating an audio guidance restriction | limiting process.

Explanation of symbols

1 Position detector (position detection means)
7 Operation switch group (Destination setting means, selection operation means, voice guidance restriction mode setting means, restriction release operation means)
8 Control circuit (route search means, calculation means, voice guidance restriction means, distance determination means, point determination means)
9 Semiconductor memory device (destination memory means)
10 Display device 12 Remote control terminal (Destination setting means, selection operation means, voice guidance restriction mode setting means, restriction release operation means)
15 Speaker (voice guidance means)
20 Storage medium 21 Hard disk device 24 Voice synthesis circuit (voice guidance means)
30 Voice recognition unit (Destination setting means, selection operation means, voice guidance restriction mode setting means, restriction release operation means)
31 Microphone (Destination setting means, selection operation means, voice guidance restriction mode setting means, restriction release operation means)
100 Navigation device

Claims (9)

Position detecting means for detecting the current position of the vehicle;
Destination setting means for setting the destination;
Route search means for searching for a guide route from the current position to the destination;
Voice guidance means for performing voice guidance on the guidance route;
A computing means for computing a distance between the current position and the destination;
Voice guidance restriction means for restricting guidance by the voice according to a decrease in the calculated distance;
A vehicle navigation device comprising: Distance determining means for determining whether the calculated distance is less than a predetermined value;
The vehicular navigation device according to claim 1, wherein the voice guidance restriction means limits the voice guidance when it is determined that the calculated distance is less than a predetermined value. A point determination means for determining whether the current position is at a point where the voice guidance is performed;
The vehicle according to claim 1 or 2, wherein the calculation means calculates a distance between the current position and the destination when it is determined that the current position is at a point where the voice guidance is performed. Navigation device.   The vehicular navigation device according to any one of claims 1 to 3, wherein the voice guidance restriction unit reduces the number of times of guidance by the voice.   5. The vehicle navigation device according to claim 1, wherein the voice guidance restriction unit does not provide guidance for a point where the voice guidance is performed. 6.   The vehicle navigation apparatus according to any one of claims 1 to 5, further comprising selection operation means for allowing a user to select whether or not to restrict guidance by voice.   The vehicular navigation device according to any one of claims 1 to 6, further comprising voice guidance restriction mode setting means for allowing a user to set a voice guidance restriction mode. Destination storage means for instructing and storing the destination on an electronic map;
As the type in which the destination is stored, home setting and other memory point setting are included,
When the home is set as the destination, the distance between the home where the voice guidance starts to be restricted and the current position is set larger than the distance when the memory point is set as the destination The restriction of the voice guidance is started at an earlier stage when the destination is at home than when the destination is the memory point. Vehicle navigation device. In a situation where guidance by voice is restricted, it has a restriction release operation means for temporarily releasing the restriction of guidance by voice with respect to the current position,
The vehicle navigation apparatus according to any one of claims 1 to 8, wherein when the restriction release operation is performed, guidance by the voice that should be restricted is performed.

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