JP2006279742A - Digital broadcasting receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcasting receiver indicating a cause of inability for viewing and listening to a user when viewing and listening becomes disabled. <P>SOLUTION: Determination whether a digital broadcasting receiver main body 1A is positioned within an area receiving is made by comparing position data of the digital broadcasting receiver main body 1A acquired by a positioning unit 19 and information indicating a receivable area of the digital broadcasting signal stored in a map database 18 and a receivable area map database 22. Then amount of time required until the point is to be displayed on a display 14 after being calculated when a receivable point is found on a driving route while displaying a message of this determination on the display 14 by reading from a message storing unit 171. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an on-vehicle digital broadcast receiver, for example.

  In recent years, digital broadcasting has been started in a terrestrial broadcasting system. Even in such digital broadcasting, development of portable and in-vehicle digital broadcasting receivers is in progress. By using such a digital broadcast receiver, the user can view a favorite program even when outdoors or driving a car.

  By the way, in the system described above, the digital broadcast receiver moves around and frequently moves beyond the broadcasting area. Analog broadcast waves have a wide range of allowable reception power, and image quality gradually deteriorates with a decrease in reception power. On the other hand, in a digital broadcast wave, the bit error rate suddenly increases at a certain reception level and error correction becomes impossible, so that image quality deteriorates rapidly and viewing becomes impossible.

For this reason, conventionally, a method has been proposed in which a reception state deterioration is predicted from data on a map (tunnel or elevated), and a route that is as uninterrupted as possible is set as a travel route (for example, Patent Document 1). In addition, there has been proposed a method of switching the reception frequency to a better broadcasting station when the reception state of the receiving broadcasting station deteriorates (for example, Patent Document 2).
JP 11-325941 A Japanese Patent Laid-Open No. 10-141586.

  However, in each of the above methods, when the reception state deteriorates and the program cannot be viewed, the user causes the problem of whether the state is a temporary reception failure or because it is out of the reception area. It cannot be recognized.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a digital broadcast receiver capable of presenting a cause of viewing inability to a user when viewing is disabled.

In order to achieve the above object, the present invention is configured as follows.
A digital broadcast receiver that receives a digital broadcast signal and reproduces and displays the received signal on a display unit, an acquisition means for acquiring position information of the digital broadcast receiver body, and information indicating an area where the digital broadcast signal can be received Region information generating means for generating information, comparing means for comparing position information obtained by the obtaining means with information indicating a receivable area, and control means for displaying a comparison result by the comparing means on a display. It is a thing.

  According to this configuration, whether or not the digital broadcast receiver main body is located in the receivable area by comparing the acquired position information of the digital broadcast receiver main body with information indicating the receivable area of the digital broadcast signal. Is determined. And this determination result is displayed on a display. Therefore, the user can grasp the cause even when viewing becomes impossible while viewing the program by viewing the display content of the display.

  The area information generating means includes a storage medium in which map information of a reference coordinate system including areas where digital broadcasting signals can be received and areas where reception is impossible is stored, and indicates areas where map information stored in the storage medium can be received It is output as information.

  According to this configuration, the area information generation circuit can be configured by a hardware circuit using a storage medium in which map information is stored, so that the location of the digital broadcast receiver main body can be easily and accurately determined. Can be done.

  Based on the comparison result between the position information and the map information by the comparison means, the calculation means includes a calculation means for obtaining a required time to the area where the digital broadcast signal can be received or a time required to the outside of the reception area, and the control means together with the comparison result The information indicating the required time obtained by the computing means is displayed on the display.

  According to this configuration, in addition to the determination result of whether or not the position of the main body of the digital broadcast receiver is within the receivable area, the required time to the receivable area or the required time to the outside of the receivable area is displayed on the display. Since it is displayed, the user can grasp the cause when the program becomes unviewable in the middle and can also determine whether or not to change the channel. Further, even when the program is being viewed, it is possible to know that the program is not visible on the way, and accordingly, it is possible to take countermeasures such as stopping the car or changing the travel route.

  Furthermore, the monitoring means for monitoring the reception quality of the digital broadcasting signal is provided, and the control means displays the comparison result between the position information and the map information by the comparison means when the reception quality falls below the reference value by the monitoring means. It is characterized by being displayed.

  According to this configuration, for example, when the display screen is small, it is difficult to see the determination information as to whether or not the user is located within the receivable area in addition to the viewing program. If the determination information as to whether or not he / she is located within the receivable area is displayed only when becomes black, the user can confirm the cause on an easy-to-see screen. Further, if the map information is displayed on the display device, the user does not feel uncomfortable.

  The area information generating means stores a plurality of map information having different conditions in the storage medium, and selectively outputs arbitrary map information from the plurality of map information stored in the storage medium according to the set conditions. It is characterized by doing. In determining the conditions, at least one of the size and shape of the mobile body on which the digital broadcast receiver body is mounted, the type of antenna attached to the digital broadcast receiver body, the reception channel, and the reception layer is used.

  According to this configuration, regardless of the use conditions of the digital broadcast receiver main body, it is possible to select the optimal map information according to the conditions and determine whether or not the digital broadcast receiver body is located in the receivable area. it can.

  The area information generating means measures the reception quality of the digital broadcast signal, records it on a recording medium, and generates information indicating a receivable area based on the measured value recorded on the recording medium.

  According to this configuration, by using the measurement value of the reception quality of the digital broadcast signal, it is possible to obtain the receivable area using the existing reception circuit system, and thus the map information becomes unnecessary, and the digital information can be obtained. It is possible to further reduce the storage capacity of the broadcast receiver main body and to simplify the circuit configuration.

  The regional information generating means measures the reception quality of the digital broadcast signal, compares the measured value with the map information stored in the storage medium, and corrects the map information based on the comparison result. .

  According to this configuration, since the map information can be corrected using the measurement value of the reception quality of the digital broadcast signal, it is reliable in determining whether the digital broadcast receiver body is located in the receivable area. The sex can be further enhanced.

The area information generating means divides the receivable area in the map information stored in the storage medium into a plurality of areas having different reception gains.
According to this configuration, if the digital broadcast receiver itself is located in a receivable area, or if it cannot be viewed, or if reception cannot be resumed even after entering a receivable point from a non-viewable state, the receivable area Among them, the cause such as being at the position of the lowest reception gain can be specified.

  The area information generating means measures the reception error rate of the digital broadcast signal for each moving point of the digital broadcast receiver main body, and generates information indicating the receivable area based on the measurement result.

  According to this configuration, by using the measurement value of the reception error rate of the digital broadcast signal, it is possible to obtain the receivable area using the existing receiving circuit system, and thus the map information becomes unnecessary, It is possible to further reduce the storage capacity of the digital broadcast receiver main body and to simplify the circuit configuration and reduce the cost.

The acquisition means generates position information based on the moving speed of the digital broadcast receiver body.
According to this configuration, the position of the digital broadcast receiver main body can be obtained using, for example, an automobile speedometer, etc., so that the circuit configuration can be compared with the case where other position detecting means such as GPS is used. Simple size reduction and cost reduction can be achieved.

  As described above in detail, according to the present invention, it is possible to provide a digital broadcast receiver capable of presenting the cause of the inability to view to the user when viewing becomes impossible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing a first embodiment of a digital broadcast receiver according to the present invention. In FIG. 1, reference numeral 1A denotes a digital broadcast receiver main body, which is mounted on a vehicle or a viewer himself (user). Is used by carrying. The digital broadcast receiver main body 1A can be fixedly installed in the house.

  In the figure, a digital broadcast signal broadcast from a broadcast station (not shown) is received by an antenna 11 and then demodulated by a reception / demodulation unit 12 to become a TS (Transport Stream). Video data and audio multiplexed on this TS Separated into data and control data. Among these, the video data is supplied to the image processing unit 13 where predetermined video signal processing is performed and displayed on the display 14. Also, the audio data is converted into an analog audio signal in the audio processing unit 15, and then supplied to the speaker 16 and output in a loud sound.

  On the other hand, the control data is taken into the control unit 17. A map database 18, a positioning unit 19, a route calculation unit 20, a required time prediction unit 21, and a receivable area map database 22 are connected to the control unit 17. The map database 18 stores reference coordinate system map data.

  The positioning unit 19 generates position data of the digital broadcast receiver main body 1A based on a signal sent from a GPS (Global Positioning System) satellite (not shown).

  The route calculation unit 20 obtains a travel route on which the digital broadcast receiver main body 1A is mounted in accordance with an instruction from the control unit 17.

  The required time predicting unit 21 can receive the closest signal on the travel route obtained by the route calculating unit 20 when the digital broadcast receiver main body 1A is out of the receivable area in accordance with the instruction from the control unit 17. The required time to the point is obtained, and when the digital broadcast receiver main body 1A is located in the receivable area, the required time to the point deviating from the receivable point on the travel route is obtained. Here, when obtaining a receivable point, a point that can be continuously received over a predetermined distance is selected. In this case, for example, it can be estimated from the past average hourly speed and the distance between the two points. Furthermore, it is possible to make a more accurate prediction by providing a communication means and acquiring the current average required time information between two points or using a future traffic jam prediction.

  The receivable area map database 22 stores receivable area map data mapped on the map data by the control unit 17.

  The control unit 17 has a reception state monitoring function, a position determination function, and a notification processing function as new functions related to the present invention in addition to the normal control function related to the reception display operation of the digital broadcast signal. Furthermore, a message storage unit 171 is provided that stores messages when the mobile phone is located within the receivable area and messages when the receivable point is found outside the receivable area and when it is not found.

  The reception state monitoring function takes in a reception state signal from the reception / demodulation unit 12 and determines from the reception state signal whether the reception quality is less than a reference value.

  The position determination function compares the position data obtained by the positioning unit 19 with the data obtained by mapping the receivable area map data to the map data, thereby determining whether or not the digital broadcast receiver main body 1A is located in the receivable area. judge.

  The notification processing function reads a message to that effect from the message storage unit 171 when the reception quality monitoring function determines that the reception quality is less than the reference value and the digital broadcast receiver main body 1A is out of the receivable area, This message and the required time to the receivable point determined by the required time prediction unit 21 are displayed on the display 14 by OSD (on screen display). In addition, you may make it notify by blinking of an LED etc. or a voice instead of OSD.

Next, the operation according to the above configuration will be described.
FIG. 2 is a flowchart showing the operation procedure and contents of the digital broadcast receiver main body 1A.

  The digital broadcast receiver main unit 1A monitors the reception status signal in step ST2a, and when the reception quality is less than the reference value, that is, when reception is interrupted (Yes), it refers to the receivable area data and is closest on the travel route. A receivable point is searched (step ST2b).

  If no receivable point is found on the route, the digital broadcast receiver main body 1A proceeds from step ST2c to step ST2d, and a message indicating that there is no possibility of resumption as shown in FIG. Supplied to the unit 13 and displayed on the display 14. As a result, the user can know that the user is out of the receivable area.

  On the other hand, if a receivable point is found on the route, the digital broadcast receiver main body 1A moves from step ST2c to step ST2e, where the time required from the current location to the receivable point is calculated, as shown in FIG. The time until the resumption of reception is presented to the user by image or voice (step ST2f).

  Thereafter, if the reception can be resumed, the digital broadcast receiver body 1A shifts the process from step ST2g to step ST2a. If the reception cannot be resumed and the travel route is changed, the process moves from step ST2h to step ST2b.

  As described above, in the first embodiment, the location data of the digital broadcast receiver body 1A obtained by the positioning unit 19 and the receivable areas of the digital broadcast signals stored in the map database 18 and the receivable area map database 22 are determined. By comparing with the information shown, it is determined whether or not the digital broadcast receiver body 1A is located in a receivable area. A message indicating this determination is read from the message storage unit 171 and displayed on the display 14. When a receivable point is found on the travel route, the required time to that point is calculated and displayed on the display 14. Like to do.

  Therefore, the user can grasp the cause even when viewing becomes impossible while viewing the program by viewing the display content of the display 14. Further, since the required time to the receivable point is displayed on the display 14, the user can grasp the cause when the program becomes unviewable in the middle and can also determine whether or not to change the channel.

  In the first embodiment, since the position of the digital broadcast receiver main body 1A is specified by using the map database 18 and the positioning unit 19, the digital broadcast receiver main body is accurate with a simple procedure. 1 position can be specified.

  Further, in the first embodiment, when viewing is disabled, a message indicating whether or not the reception area has been removed is displayed. In this way, for example, when the display screen is small, it becomes difficult to see if a message indicating whether or not you are located in the receivable area is displayed in addition to the viewing program. If the message indicating whether or not he / she is located within the receivable area is displayed only when the error occurs, the user can confirm the cause on an easy-to-read screen.

(Second Embodiment)
FIG. 5 is a block diagram showing a second embodiment of the digital broadcast receiver according to the present invention, and reference numeral 1B in the figure indicates the digital broadcast receiver body. In FIG. 5, the same parts as those in FIG.

  In the second embodiment, a reception state recording unit 23 and a receivable area prediction unit 24 are connected to the control unit 17. Further, the receivable area prediction unit 24 is connected to a radio wave state map database 25.

  The radio wave state map database 25 stores reception state map data obtained by dividing a receivable area into a plurality of regions having different reception gains [dB].

  The reception status recording unit 23 records the reception propriety determination result measured at regular intervals while the automobile equipped with the digital broadcast receiver main body 1B is running.

  The receivable area prediction unit 24 determines areas that can be received at observation points at a predetermined ratio or more in the reception state map data recorded in advance in the radio wave state map database 25 from the measurement result by the reception state recording unit 23. Calculate as a receivable area. And the control part 17 calculates | requires a reception resumption point using this receivable area.

Next, the operation according to the above configuration will be described.
FIG. 6 shows the radio wave state map data, a plot of the observation result on the map, the ratio of the observation result for each electric field strength, and the receivable area data after prediction. In this example, an electric field intensity region having a receivable point of 90% or more is predicted as a receivable region.

  In this way, more accurate prediction is possible by further correcting the traveling direction and speed with respect to the transmitting station. In addition, by plotting the observation results on the radio wave condition map data, when the digital broadcast receiver main body 1B is located in the receivable area and cannot be viewed, the lowest reception is possible in the receivable area. Even the cause such as being in the position of gain (for example, 50 dB or 60 dB) can be specified.

  In addition, the observation result may vary depending on the use conditions of the digital broadcast receiver body 1B. The usage conditions include the size and shape of the automobile (sedan or one box) on which the digital broadcast receiver body 1B is mounted, the mounting position of the antenna 11 (height, front, side or rear), antenna There are 11 types (2ch diversity, 4ch diversity, pole antenna, glass antenna), reception channel and reception layer (partial reception or full reception).

  Therefore, in the second embodiment, only an area with a high reception probability is cut out from the observation result plotted on the radio wave state map data, and this cut out area is used as a receivable area of the digital broadcast receiver body 1B. I have to.

  As described above, in the second embodiment, in addition to the map data and the receivable area map data, the reception propriety determination result measured at regular intervals while the vehicle equipped with the digital broadcast receiver main body 1B is running, A reception resumption point or the like is predicted using reception state map data obtained by dividing a receivable area into a plurality of areas having mutually different reception gains.

  Therefore, even if the digital broadcast receiver main body 1B is located in the receivable area, when viewing is impossible, or when reception cannot be resumed even after entering the receivable point from the unviewable state, 50 dB within the receivable area. It is also possible to specify the cause such as being in the position of this, and thereby it is possible to predict the receivable point more accurately.

  Further, since any area can be cut out from the receivable areas divided into a plurality of areas according to the use conditions of the digital broadcast receiver body 1B, the use conditions of the digital broadcast receiver body 1B are Whatever the condition, it can be accurately determined whether or not it is located in the receivable area according to the condition.

(Third embodiment)
FIG. 7 is a diagram for explaining an example of an operation for correcting radio wave state map data stored in advance as a third embodiment of the present invention.

  In this case, correction is performed so as to expand or reduce to an area that can be received at a predetermined percentage of the observed reception availability status. In this example, if the area is reduced by 80% around the transmitting station, the ratio of receivable points becomes 90% or more.

  As described above, according to the third embodiment, the radio wave condition map data can be corrected using the observation result plotted on the radio wave condition map data, so that the digital broadcast receiver main body 1B can receive, for example. The reliability can be further improved in determining whether or not it is located in the area.

(Fourth embodiment)
FIG. 8 is a diagram showing the future reception state on the path, not the expected reception restart time, as a fourth embodiment of the present invention. FIG. 9 shows the future reception state between the distance axis and the reception state. It is the figure represented by the correspondence.

  In the fourth embodiment, when the digital broadcast receiver main body 1B goes out of the receivable area and the viewing screen on the display 14 becomes black, the map data showing the future reception state on the route is displayed on the display 14. To be displayed. Thereafter, when the reception state is recovered, the original program viewing screen is restored.

  As described above, according to the fourth embodiment, even if the viewing screen becomes black, displaying the map data does not give the user a sense of incongruity. Further, since the required time predicting unit 21 is not necessary, the circuit configuration can be simplified and reduced accordingly.

(Fifth embodiment)
FIG. 10 is a block diagram showing a fifth embodiment of a digital broadcast receiver according to the present invention, and reference numeral 1C in the drawing denotes a digital broadcast receiver body. In FIG. 10, the same parts as those in FIG.

  In the fifth embodiment, a speed information acquisition unit 26, a reception error rate recording unit 27, and a reception area outside determination unit 28 are connected to the control unit 17.

  The speed information acquisition unit 26 acquires speed information using a speedometer provided in an automobile or the like. The reception error rate recording unit 27 measures the reception error rate of the digital broadcast signal for each moving point of the digital broadcast receiver main body 1C, and records this measured value.

  The out-of-reception-area determining unit 28 refers to the change in the past error rate recorded in the reception error rate recording unit 27 when reception is impossible, and the error rate continues to increase by a predetermined distance (Dth) or more. If it is, it is determined that the area is out of the receivable area. Then, the control unit 17 reads a message corresponding to the determination result from the message storage unit 171, supplies the message to the image processing unit 13, and causes the display 14 to display the message.

Next, the operation according to the above configuration will be described.
FIG. 11 is an example of characteristics that can be determined to be outside the area, and FIG. 12 is an example of characteristics that can be determined to be unable to be received locally such as a tunnel.

  In the fifth embodiment, even when the travel route is not fixed, the determination can be made without having the reception state map data. If the speed information and time are known, the moving distance can be calculated, so that the positioning unit 19 is not required.

  As described above, in the fifth embodiment, the speed information of the vehicle equipped with the digital broadcast receiver main body 1C obtained by the speed information acquisition unit 26 and the reception of the digital broadcast signal recorded in the reception error rate recording unit 27 are received. Based on the measurement value of the error rate, it is determined whether or not the digital broadcast receiver main body 1C is located in a receivable area.

  Accordingly, the user can grasp the cause of the case where viewing is impossible during viewing of the program by viewing the display content of the display 14, and the map database 18 and the receivable area map database 22 are unnecessary. As a matter of course, the storage capacity of the digital broadcast receiver main body 1C can be further reduced, the circuit configuration can be easily reduced in size and cost, and compared with the case where the positioning unit 19 such as a GPS receiver is used. The circuit configuration can be easily reduced in size and cost.

(Other embodiments)
The present invention is not limited to the above embodiments. For example, in the first embodiment described above, an example in which a message to that effect is displayed on the display when the digital broadcast receiver main body is out of the receivable area has been described. However, the present invention is not limited to this, and when the digital broadcast receiver itself is located within the receivable area and the point deviating from the receivable area is within the predetermined time, for example, “There is a possibility that it cannot be received after SS seconds. May be displayed on the display. In this way, even if the user is watching the program, the user can know that the program will not be visible in the middle, so that the user can take measures such as stopping the car or changing the travel route. it can.

  Further, in each of the above embodiments, an example has been described in which various messages when the message storage unit is out of the receivable area are displayed on the display. However, not limited to this, if you are unable to view when you are within the coverage area, display the message “Receiving status has temporarily deteriorated. Please wait.” Also good.

  In the second embodiment, the example in which the map database, the radio wave state map database, the receivable area prediction unit, and the reception state recording unit are provided has been described. However, the present invention is not limited to this, and only the reception state recording unit may be used. In this way, by using the measurement value of the reception quality of the digital broadcast signal, it is possible to determine the receivable area using the existing reception circuit system, and thus the map information is not necessary, so digital It is possible to further reduce the storage capacity of the broadcast receiver main body and to simplify the circuit configuration.

  In the second embodiment, an example in which only an area having a high reception probability is cut out from the observation result plotted on the radio wave state map data according to the use conditions of the digital broadcast receiver main body has been described. However, the present invention is not limited to this, and a plurality of different map data for each use condition is stored in advance in the map database so that the user can select and set the map data according to the use condition from the plurality of map data. Good.

  In the above embodiments, the internal configuration of the digital broadcast receiver main body has been described as a hardware configuration, but a software configuration may also be used. In this way, since each process can be realized by software, the configuration is simplified and it is possible to contribute to downsizing.

  In the implementation stage, the constituent elements can be modified and embodied without departing from the spirit of the invention, and various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment.

1 is a block diagram showing a first embodiment of a digital broadcast receiver according to the present invention. The flowchart which shows the operation | movement procedure of the digital broadcast receiver main body in the said 1st Embodiment, and its content. The figure which shows the example of a message display when a receivable point is not found out of a receivable area in the said 1st Embodiment. The figure which shows the example of a message display when a receivable point is found out of the receivable area in the first embodiment. The block diagram which shows 2nd Embodiment of the digital broadcast receiver concerning this invention. The figure which shows the example which plotted the observation result with respect to the electromagnetic wave state map data in the said 2nd Embodiment. The figure shown in order to demonstrate the operation example which correct | amends the radio wave state map data memorize | stored beforehand as 3rd Embodiment of this invention. The figure which showed the future receiving state on the path | route as 4th Embodiment of this invention. In the 4th Embodiment, the figure which represented the future receiving state by the correspondence of a distance axis and a receiving state. The block diagram which shows 5th Embodiment of the digital broadcast receiver concerning this invention. The characteristic view which can be judged that it went out of the area in the said 5th Embodiment. The characteristic view which can be judged that it became impossible to receive locally, such as a tunnel, in the said 5th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1A, 1B, 1C ... Digital broadcast receiver main body, 12 ... Reception / demodulation part, 13 ... Image processing part, 14 ... Display, 15 ... Sound processing part, 16 ... Speaker, 17 ... Control part, 18 ... Map database, 19 ... Positioning unit, 20 ... Route calculation unit, 21 ... Required time prediction unit, 22 ... Receivable area map database, 23 ... Reception state recording unit, 24 ... Receivable area prediction unit, 25 ... Radio wave state map database, 26 ... Speed information Acquisition unit, 27... Reception error rate recording unit, 28... Out of reception area determination unit, 171.

Claims (13)

A digital broadcast receiver that receives a digital broadcast signal and reproduces and displays the received signal on a display.
Acquisition means for acquiring position information of the digital broadcast receiver body;
Area information generating means for generating information indicating an area where the digital broadcast signal can be received;
Comparing means for comparing the position information obtained by the obtaining means and information indicating the receivable area;
A digital broadcast receiver comprising control means for displaying a comparison result by the comparison means on the display. The area information generating means includes a storage medium in which map information of a reference coordinate system including an area where the digital broadcast signal can be received and an area where the digital broadcast signal cannot be received is stored, and the map information stored in the storage medium can be received. 2. The digital broadcast receiver according to claim 1, wherein the digital broadcast receiver is output as information indicating a region. Furthermore, based on a comparison result between the position information and the map information by the comparison means, the calculation means for obtaining a required time to the reception area of the digital broadcast signal or a required time to the outside of the reception area,
3. The digital broadcast receiver according to claim 2, wherein the control means displays information indicating the required time obtained by the computing means together with the comparison result on the display. And further comprising monitoring means for monitoring the reception quality of the digital broadcast signal,
The said control means displays the comparison result of the said positional information and the said map information by the said comparison means on the said display, when the said reception quality falls below a reference value by the said monitoring means. 2. The digital broadcast receiver according to 2. The area information generating means stores a plurality of map information having different conditions in the storage medium, and selects arbitrary map information from the plurality of map information stored in the storage medium according to a set condition 3. The digital broadcast receiver according to claim 2, wherein the digital broadcast receiver outputs the digital broadcast. The area information generating means determines the condition by determining the size / shape of the mobile body on which the digital broadcast receiver body is mounted, the type of antenna attached to the digital broadcast receiver body, the reception channel, and the reception layer. 6. The digital broadcast receiver according to claim 5, wherein at least one of them is used. The area information generating means measures the reception quality of the digital broadcast signal, records it on a recording medium, and generates information indicating the receivable area based on the measured value recorded on the recording medium. The digital broadcast receiver according to claim 1. The area information generating means measures reception quality of the digital broadcast signal, compares the measured value with map information stored in the storage medium, and corrects the map information based on the comparison result. The digital broadcast receiver according to claim 2. 3. The digital broadcast receiver according to claim 2, wherein the area information generating means divides a receivable area in the map information stored in the storage medium into a plurality of areas having different reception gains. Furthermore, it further includes detailed information storage means for storing detailed information in association with the comparison result by the comparison means,
2. The digital broadcast receiver according to claim 1, wherein the control means reads out corresponding detailed information from the detailed information storage means together with the comparison result, and displays it on the display. The area information generating means measures a reception error rate of the digital broadcast signal for each moving point of the digital broadcast receiver body, and generates information indicating the receivable area based on the measurement result. The digital broadcast receiver according to claim 1. The digital broadcast receiver according to claim 1, wherein the acquisition unit generates the position information based on a signal transmitted from a satellite of a satellite positioning system. The digital broadcast receiver according to claim 1, wherein the acquisition unit generates the position information based on a moving speed of the digital broadcast receiver body.

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