JPH08191233A - Broadcasting data receiver - Google Patents

Abstract

PURPOSE: To optimize the switching of an FM multiplex broadcast station by selecting and receiving a broadcast station to be selected based upon the contents of recognized data. CONSTITUTION: The tuning frequency of a tuner 12 is switched by an instruction outputted from a data processing part 16 to change a receiving broadcast station. In this case, the data processing part 16 confirms broadcast contents transmitted from respective broadcast stations and switches the tuning frequency to a broadcast station having the same contents. Thereby broadcast of the same contents can be selected even when a receiving level is dropped. In order to check the contents, a receiving broadcast station can be switched so as to always obtain information from the periphery of a current position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast data receiving apparatus for receiving traffic information provided by, for example, FM multiplex broadcasting, and more particularly to selecting a broadcasting station.

[0002]

2. Description of the Related Art Traffic information such as traffic jam information is useful when a vehicle is traveling. This traffic information was usually obtained from traffic information news broadcast on radio. Here, recently, FM multiplex broadcasting has been started in which traffic information and the like are multiplexed and broadcast on FM broadcasting. In this FM multiplex broadcasting, traffic information is multiplexed as digital data on a broadcast wave, and by providing a predetermined decoder, the traffic information can be extracted from the received waves of the FM broadcast.

The traffic information obtained in this way is
It is digital code data that can be stored in memory. Therefore, the information can be displayed as character data on the display for a predetermined period, or can be output as voice when desired.

Further, as the data transmitted by the FM multiplex broadcasting, map display data and the like are also considered, and if this is taken in, it is possible to provide route guidance based on the latest information.

Here, the reception status of the broadcast in the vehicle is
It changes with driving. For this reason, the received electric field strength of the radio wave from the broadcasting station that is receiving while traveling may decrease,
In this case, the receiving broadcasting station must be changed. On the other hand, some FM broadcasting stations perform FM multiplex broadcasting and some do not, and when switching to another receivable station, the station provides the traffic information service by FM multiplex broadcasting. It also happens when you do not go.

Therefore, Japanese Utility Model Laid-Open No. 5-76128 discloses an FM multiplex broadcasting receiver which automatically selects a channel when the received electric field strength decreases, and when the traffic information receiving function is ON during automatic channel selection. It is described that selects a broadcasting station that broadcasts traffic information. With this device, traffic information can be continuously received.

[0007]

SUMMARY OF THE INVENTION Here, the broadcasting station is FM
There are several types of traffic information transmitted by multiplex broadcasting. For example, some include map data for vehicles having a navigation device, and some only display characters. Also, different broadcast stations may have different levels of traffic information being transmitted.

In the above-mentioned conventional example, if the traffic information is transmitted, it is switched to the broadcasting station. Therefore, it was switched to a broadcast station that received unnecessary data, or received and stored image data for navigation, but provided only text data, and the data that had been received up to that point was wasted. The problem arises that Therefore, there is a demand to prevent such waste when switching the receiving broadcast station.

Further, the traffic information necessary for the vehicle is
It depends on the current location of the vehicle and the route to the destination. Therefore, there is also a demand to switch to a broadcasting station that provides optimum traffic information as the vehicle travels.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a broadcast data receiving apparatus capable of optimally switching a receiving broadcast station.

[0011]

SUMMARY OF THE INVENTION The present invention is a broadcast data receiving apparatus for obtaining traffic information from radio waves from a broadcasting station,
Receiving means for receiving the radio waves transmitted from the broadcasting station,
Based on the recognized data content, the broadcasting station search means for changing the reception frequency and searching for the broadcasting station, the reception content recognition means for recognizing the data content from the traffic information data of the searched broadcasting station, and the next selection based on the recognized data content. And a broadcasting station selecting means for selecting a broadcasting station to be stationed.

Further, according to the present invention, the broadcasting station selecting means is
When a broadcast from a predetermined substitute broadcast station cannot be received, a broadcast station having the same content is selected as a broadcast station to be selected next.

Further, the present invention further comprises a current position recognizing means, wherein the broadcasting station selecting means determines a place according to the recognized current position and provides traffic information about this place. The feature is that the broadcasting station is selected as a broadcasting station to be selected next.

Further, the present invention further comprises route setting means, and the broadcasting station selecting means determines a place according to the current position and the route and provides the traffic information about this place. Is selected as a broadcasting station to be selected next.

[0015]

As described above, according to the present invention, when the receiving broadcast station is switched, the broadcast station is searched and the broadcast content of the searched broadcast station is confirmed. Then, the receiving broadcast station to be switched next is selected based on the confirmed broadcast content. Therefore, it is possible to continuously receive data having the same content, and it is possible to prevent a situation in which previously received data is wasted.

Further, it is generally known which broadcasting station is broadcasting the same contents, and in many cases, this information is held.

In this case, when the broadcast from the predetermined alternative broadcast station cannot be received, the broadcast station is searched for the same contents and set as the next broadcast station. This allows more efficient selection of broadcasting stations.

Further, when the switching is performed, if the broadcasting station of the switching destination confirms which region of the data is provided, the switching can ensure that optimum data is always received even if the current position is moved by the traveling of the vehicle. It can be carried out.

Further, when the route is set by the navigation device or the like, the receiving broadcast station can be switched based on this information so as to obtain necessary information along the route. Therefore, the optimum information can always be obtained.

[0020]

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

[Description of Configuration of Embodiment] FIG. 1 is a block diagram showing an overall configuration of the embodiment. The antenna 10, the tuner 12, the FM multiplex decoder 14, the data processing unit 16,
The memory unit 18, the display unit 20, and the level determination unit 22 are included. The broadcast radio wave received by the antenna 10 is supplied to the tuner 12, where a radio wave having a predetermined frequency (a radio wave of a predetermined broadcasting station) is extracted. The signal obtained by the tuner 12 is subjected to predetermined processing by an ordinary processing circuit (not shown) and output from the speaker. on the other hand,
In this device, the output of the tuner 12 is the FM multiplex decoder 1
4 and the multiplexed data (traffic information) multiplexed on the FM broadcast wave is decoded here.

That is, in the FM broadcasting, the main channel signal (L + R) and the sub channel signal (LR) are used as the modulation signals, but in the FM multiplex broadcasting, it is out of the normal modulation signal band (the band centering around 76 kHz). The multiplexed data is superimposed as digital data (16 kbit /
Seconds, LMSK modulation). Then, FM modulation is performed using this. Therefore, the FM multiplex decoder 14
The superposed digital data is extracted from the detection signal and supplied to the data processing unit 16 as digital data of "0" and "1".

The data processing unit 16 processes the supplied digital data, stores it in the memory unit 18, and supplies it to the display unit 20 to display the received multiplex data. For example, in the case of traffic congestion information including map data, image data is created by data processing and displayed on the display unit 20. As the display unit 20, for example, a liquid crystal color display which is also used as a display unit of a navigation device is adopted.

Then, in the present embodiment, the data processing section 16 judges the content of the received multiplex data,
The tuning frequency in the tuner 12 is changed based on this content.

Further, in the tuner 12, when the signal level of the extracted receiving broadcast station becomes low, the level determination section 22 detects this and informs the data processing section 16. Therefore, the data processing unit 16 switches the receiving broadcast station based on this.

The memory unit 18 has memories A and B inside.
It has two areas of 1) and 2), and is used by switching at any time according to the broadcasting station when storing the received multiplex data. In addition,
The decrease in the reception level may be detected when the error rate in the output of the FM multiplex decoder 14 becomes a predetermined value or more.

Further, in this example, a navigation device 24 for guiding the route when the vehicle is traveling is provided,
From here, the current location information and the route information are supplied to the data processing unit 16. Therefore, the data processing device 16 can control the switching of the receiving broadcast station based on these pieces of information. The display of the route on the navigation device 24 is performed on the display unit 20.

Here, the antenna 1 is shown in FIG.
0, a tuner 12, and two FM multiplex decoders 14 are provided for each of the first and second antennas 1.
0a, 10b, first and second tuners 12a, 12b, and first and second FM multiplex decoders 14a, 14b. Therefore, radio waves of two frequencies (broadcasts from two broadcasting stations) can be received at the same time, and the tuning frequencies in the tuners 12a and 12b can be changed based on the contents of the two multiplexed data. In this example, the tuner 12a is the main tuner, and the tuner 12b is the sub-tuner. Normally, the received data from the main tuner 12a is used to receive multiplex data, and the sub-tuner 12b is switched when the receiving broadcast station is switched. Use it to search for the broadcasting station to switch to. The other components are the same as those of the apparatus shown in FIG.

"Explanation of Contents of Multiplexed Data" Here, contents of the multiplexed data will be described. The multiplex data forms a frame of 288 × 272 bits as shown in FIG. From here, error correction code (CRC, parity),
When the block identification (BIC) is removed, one row of data in the frame consists of a 176-bit data packet as shown in FIG.
It consists of a prefix of bits and a data block of 144 bits.

The prefix of this data packet is
As shown in FIG. 5, a 4-bit service identification code and 1
It contains a 4-bit data group number. And
As shown in FIG. 6, the service identification code indicates the content of the service based on the multiplexed data, and is currently 1 to 6
6 types are defined (16 types can be defined because of 4 bits).

That is, the service identification codes 1 to 3 are:
General information including ordinary news is shown, and 4 to 6 show traffic information (hereinafter referred to as VICS information). Where V
The ICS information has levels 1 to 3, 4 is character information, and levels 1 and 5 are graphic information. Levels 2 and 6 are links to be used in the navigation device (usually, roads are used between intersections and vertical lines). It represents level 3 including traffic congestion information for each unit of the road divided by.

Therefore, by recognizing the service identification code, it is possible to judge the content of the service provided by the FM multiplex broadcasting. Therefore, when the broadcasting station is switched, by switching to the broadcasting station having the same service identification code, it is possible to continuously obtain the information of the same content. The service identification code is always sent every 288 bits. Therefore, the content of the multiplexed data can be instantly determined by the determination of the service identification code.

However, the broadcasting station that provides VICS information also sends general information at the same time. Therefore, while the general information is being sent, the service identification code indicates the general information, and it is not possible to judge whether or not the broadcasting station provides the VICS information. However, a broadcasting station that provides VICS does not perform VI once in one frame (82,144 bits).
Since CS information is always sent, 5.1
It can be determined once a second whether or not VICS information is provided (82, 144/16 k (bps) =
5.1 seconds).

However, with this service identification code alone,
In some cases, a reliable determination cannot be made. That is, with respect to the macro common to the programs (information about the rough sketch), the service identification code is given without distinguishing between the general information and the VICS levels 1 and 2. Therefore, it may not be possible to identify these services.

On the other hand, the data group number consists of an 8-bit program number and a 6-bit page number as shown in FIG. 7, and it is judged from this program number whether the corresponding data block is macro data common to the program. can do. That is, it is agreed that the program numbers are numbers from 0 to 255 and that the macro program numbers are transmitted with four numbers from 250 to 253. Therefore, referring to the program number of this data group number, the service identification code is VI
When it is determined that the received information is the CS number and the program number is not the program common macro data, it can be concluded that the received information is the VICS information.

As described above, by referring to the program number in the data group number in accordance with the service identification code, the accuracy of recognizing the content of the received information can be improved.

Further, as shown in FIG. 8, the data blocks following the data packet prefix form a group of data by combining the data blocks of a plurality of data packets. The data of one group includes data group data, and the data group data includes data header parameters and data header data, as shown in FIG.

As shown in FIG. 10, this data group data includes data indicating the information type of the data group data. There are two types of program data headers included here, A and B (A is 4 bytes, B is 9 bytes), and in the case of B, information about the location to which the traffic information belongs. It is included.

That is, the program data header B is shown in FIG.
As shown in, the data includes the place where the information such as the prefecture identification code corresponds. Similarly, there are two types of page data head data, A and B,
The page data head data B includes data about places such as prefecture identification code data, as shown in FIG.

Therefore, by checking the data contents of the program data head and page data head in the data group data, it is possible to recognize which area the traffic information provided is for. If the program data header B is complete, VICS, news, weather forecast, etc. can be distinguished. On the other hand, if the contents of the page data head data are complete and the information is about VICS, traffic congestion information, parking lot information, section travel time, etc. can be distinguished.

As described above, the content of the multiplexed data is determined by the data processing unit 16 shown in FIGS.

"Operation when the reception level is lowered" Next, the process when the reception level is lowered in the present embodiment will be described with reference to FIG. First, when FM multiplex broadcasting is being received while the vehicle is traveling, it is monitored whether the decrease in the reception level from the FM multiplex broadcasting station has become a predetermined value or less (S11). If there is no decrease in the reception level, it is not necessary to switch the broadcasting station, and thus the determination in S11 is repeated. Note that the determination in S11 may be YES only when the reception level continues to decrease for a predetermined time or longer. Then, when the reception level is lowered, it is determined whether or not the alternative frequency data is present (S12). This alternative frequency data is included in FM multiplex broadcasting, and is a list (AF data) indicating frequencies of broadcasting stations that may transmit the same broadcasting program as its own broadcasting program. When the data processing unit 16 receives the AF data, the data processing unit 16 stores the AF data in the memory unit 18. Therefore, if the data is stored, the broadcast to be switched to the reception deterioration of the broadcasting station receiving the data. I know the station.

Therefore, if the alternative frequency data is present in S12, the receiving broadcast station is sequentially switched based on the AF data, and it is determined whether there is a receivable station in the alternative frequency list (S13). If there is a receivable station, the receiving broadcast station is changed to the station having the highest reception level (S14). Note that this frequency change is performed by changing the tuning frequency of the tuner 12 according to an instruction from the data processing unit 16.

On the other hand, it is considered that there is no effective AF data when the power is turned on for the first time after purchasing the FM multiplex receiver or when the power of the receiver is suddenly turned on when moving to a remote place. . Therefore, in this case, NO is obtained in S12. In some cases, there is no receivable station in the alternative frequency list. In this case, S13 is NO. In such a case, the device has to find a broadcasting station to switch to. Then, the tuner 12
In step S15, the tuning frequency is changed to list the FM multiplex broadcasting stations that are currently receivable and the contents of each multiplexed data are confirmed (S15).

Next, based on the processing result of S15, it is determined whether or not there is a VICS providing station having a high reception level (S16). This determination is performed based on the service identification code of the transmission data, the data group number, etc. as described above. If NO in S16, it means that there is no broadcasting station to be switched, and reception is continued at the same frequency for a while (S17).

On the other hand, if YES in S16, it is determined whether or not there is a station providing the information of the same prefecture as the content of the memory A in the memory unit 18.
Here, in this example, the data currently being received is stored in the memory A, and the memory B stores the multiplex data from the broadcasting station which was being received before switching to the currently receiving broadcasting station. I decided to stay. Then, YES in S18
If it is, it is desirable to switch to a station that provides information on the same area as the currently receiving station, so the reception level is the highest among the stations that provide information on the same prefecture. Change to a strong station (S19). Also, S1
If NO in 8, the contents of the memory B and
It is determined whether or not there is a station providing information on the same prefecture (S20).

If YES in S20,
The tuning frequency in the tuner 12 is changed to switch to reception by the broadcasting station (S21). On the other hand, in the case of NO in S20, there is no station providing the data of the same area as the data stored in the memories A and B, so that the VICS information can be received. Select one of the different stations (for example,
The tuning frequency of the tuner 12 is changed to the tuning frequency of the broadcasting station having the highest reception level) (S22).
When the receiving broadcast station is changed in either S21 or S22, the data to be received is stored in the memory B in order to save the data received so far (S23).

As described above, according to the judgment of the data processing section 16, if there is alternative frequency data, the alternative frequency data is used to switch the broadcasting station, and as much information as possible that has been obtained so far is obtained. It is possible to switch between broadcast stations by selecting available broadcast stations.

In the above example, 1 shown in FIG.
Although the operation has been described based on the configuration of the tuner, the same processing can be performed in the case of the two tuner shown in FIG. In this case, in S13 and S15, the first tuner 12a
Continues the reception as it is, and searches the second tuner 12b and confirms the received contents. In addition, S19,
In S21 and S22, the first main tuner 12a continues to receive as it is for a while, the second tuner 12b collects data for a while, determines whether switching is correct, and then the tuning frequency of the first tuner 12a is set. Change to the tuning frequency of the second tuner 12b. As a result, when the reception level of the receiving broadcast station is restored, it is possible to continue the reception from that broadcast station.

"Operation with Route Setting (One Tuner)" Next, in the case where the vehicle is equipped with the navigation device 24, suitable switching of the receiving broadcast station will be described with reference to FIG. This example is shown in FIG.
This is the case of a tuner. First, the data processing unit 16 determines whether or not the route is set in the navigation device 24 (S31). YE in S31
If it is S, then it is determined whether or not the set route extends over two or more prefectures (S3).
2). If YES in S32, the FM multiplex broadcasting station is switched based on the route.

That is, V by general FM multiplex broadcasting
Every 5 minutes, which is a break in the ICS information, the FM multiplex station is scanned to check the prefecture identification code of the provided data (S33). This confirmation is performed by confirming the content of the data (the prefecture identification code included in the data shown in FIG. 11 or 12). When the prefecture code is confirmed in S33, it is determined whether or not there is a station providing information on the prefecture to be passed next (S3).
4). If NO in S34, the process returns to S31. Then, when the route setting is lost, or when the route is changed so that the route does not cross two or more prefectures, the determination result in S31 and S32 is NO. When the broadcast content of the FM multiplex station is changed in S33, this is recognized and the determination in S34 is repeated. If YES in S34, it is determined whether or not the distance between the prefectural border and the current location is within Δkm on the route (S3).
5). If NO in S35, the process returns to S31 and the determination is repeated. The determination in S35 is a determination for collecting data earlier when the receiving broadcast station is changed in one tuner.

If YES in S35,
It is changed to the broadcasting station which provides the information of the prefecture passing through the tuner 12 (S36). Then, as soon as the data are collected, the contents displayed on the display unit 20 are changed to those of the changed station (S37). In this way, when there is a route setting, information about the next prefecture can be obtained before reaching the next prefecture on the route, and information can be provided according to the driver's request. .

If NO in S31 and S32, it is not necessary to switch the broadcasting station according to the route setting. Therefore, in this case, it is determined whether or not the current location and the prefecture of the data being received are different (S38). N in S38
If it is O, it is sufficient to receive the multiplexed data as it is, and the process returns to S31. On the other hand, if YES in S38, it is preferable to switch to a broadcasting station that provides information about the current location. Therefore,
A list of currently receivable FM multi-stations is listed, and they are sequentially received to confirm the contents of each data (S3
9). Then, depending on the confirmed data content, it is determined whether or not there is a station providing information on the same prefecture as the current location (S40). If YES in S40, the receiving broadcast station is changed to the broadcast station providing the information of the prefecture of the present location (S41). On the other hand, if NO in S40, the reception is continued for a fixed time (S42).

In this way, when there is a route setting, in order to obtain information on the prefecture on the route which is considered to enter next at a predetermined timing, when the broadcasting station is switched or there is no route setting, , It is possible to receive multiplex data from a broadcasting station providing information on the current location.

"Switching of broadcasting stations according to route setting (2
(Tuner)) Next, switching of the receiving broadcast station in the case of the two tuner shown in FIG. 2 will be described with reference to FIG. First, the first tuner 1 which is the main tuner
The data of 2a is received and the data storage is started (S51). Next, it is determined whether or not there is a route setting in the navigation device 24 (S52). Then, if the route has been set, it is determined whether or not the route extends over two or more prefectures (S53). If the route spans two or more prefectures, the second tuner
The tuner 12b searches for an FM multiplex broadcasting station providing information on a prefecture to be passed next on the route.
If found, the tuning frequency of the second tuner 12b is fixed to the broadcasting station and the data is saved (S5).
4). Then, at the same time when the storage of this data is started, the current position is confirmed in the navigation device 24 (S55).

Then, the prefecture of the data being received by the first tuner 12a is compared with the current location to determine whether or not the current location is different (S56). If they are the same, it is not necessary to change the broadcasting station, and the process returns to S51. On the other hand, S5
If YES in 6 and the information currently being received is not information about the current location, the second tuner 12b
It is determined whether the prefectural code of the data being received is the same as the present location (S57). If the vehicle has traveled along the set route, YE is performed in S56.
If S, S57 should also be YES, but if the vehicle does not travel along the route, it may enter a different prefecture. In this case, S57
In the case of NO in that case, the first tuner 12a continues the reception as it is, but the second tuner 12b starts scanning, finds a station providing information on the current location, and starts storing the data (S58). . Then, it is determined whether or not the data of the sub tuner is enriched (S59),
In the case of fullness, the first tuner becomes the secondary tuner and the second tuner
The tuner is the main tuner. Also, the first tuner 12
Using the memory corresponding to a as the main memory and the memory corresponding to the second tuner 12b as the sub memory, multiplexed data is received using the main tuner and the main memory (S60).
The process in S60 is similarly performed when YES in S57.

If NO in S52 and S53,
It is not necessary to switch the broadcasting station according to the route. Therefore, the second tuner 12b regularly (for example, every 5 minutes) FM
The multiple broadcast station is scanned to check the broadcast content (S61). Then, based on the check result of the contents of S61, it is determined whether or not the current location and the prefecture of the data being received are different (S62). If they are the same, there is no need to change the receiving broadcast station, and the process returns to S52. On the other hand, if the prefecture data of the data currently being received and the prefecture data of the current location are different, the broadcasting station should be changed. Therefore,
Based on the data obtained by the second tuner 12b, it is determined whether or not there is a broadcasting station providing the data of the same prefecture as the present location (S63). If NO in S63, the main tuner continues to receive without changing (S64). On the other hand, if YES in S63, based on the information received by the second tuner 12b, the data from the broadcasting station providing the information of the current location is collected and stored (S65). Then, when the data obtained from the second tuner 12b is substantial (S66),
The master-slave of the first tuner 12a and the second tuner 12b are switched, and the master-slave of the memory corresponding to these tuners is also switched (S60). In this example, the memories A and B are allocated correspondingly to the first and second tuners 12a and 12b, respectively, and when the sub-tuner is performing a search or simply confirming the contents, the memories A and B are different from each other. Data may be stored in another area.

In this way, when there is a route setting, a broadcasting station that provides data on the next prefecture to enter in accordance with the route is found, and if it enters there, the broadcasting station is promptly notified. Switch to. On the other hand, when the route is not set or the route does not extend over two or more prefectures, the broadcasting station providing the information about the current position is selected based on the current position. This ensures that the information requested by the driver can always be obtained.

It is preferable to combine both the processing of FIG. 13 and the processing of FIGS. The present invention is particularly preferably used for a mobile body such as a vehicle. Furthermore, it is also possible to select broadcasts having the same content in general information.

[0060]

As described above, according to the present invention,
When switching the receiving broadcast station, the broadcast station is searched and the broadcast content of the searched broadcast station is confirmed. And
The receiving broadcast station to be switched next is selected based on the confirmed broadcast content. Therefore, it is possible to continuously receive data having the same content, and it is possible to prevent a situation in which previously received data is wasted.

Further, it is generally known which broadcasting station is broadcasting the same contents, and in many cases, this information is held.

In this case, when the broadcast from the predetermined alternative broadcast station cannot be received, the broadcast station is searched for the same contents and set as the next broadcast station. This allows more efficient selection of broadcasting stations.

In addition, by confirming which region the destination broadcasting station provides data at the time of switching, it is possible to always receive optimum data even if the current position is moved by the traveling of the vehicle. It can be carried out.

Further, when the route is set by the navigation device or the like, the receiving broadcasting station can be switched based on this information so as to obtain necessary information along the route. Therefore, the optimum information can always be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment.

FIG. 2 is a block diagram showing an overall configuration of an embodiment of two tuners.

FIG. 3 is a diagram showing a structure of a frame of multiplexed data.

FIG. 4 is a diagram showing a structure of a data packet.

FIG. 5 is a diagram showing the structure of a prefix.

FIG. 6 is a diagram showing the contents of a service identification code.

FIG. 7 is a diagram showing the contents of a data group number.

FIG. 8 is a diagram showing a relationship between data groups and data blocks.

FIG. 9 is a diagram showing a structure of data group data.

FIG. 10 is a diagram showing the contents of a data header parameter.

11 is a diagram showing a structure of program data header data B. FIG.

FIG. 12 is a diagram showing a configuration of page data header data B.

FIG. 13 is a flowchart showing a receiving broadcast station switching process when the reception level is lowered.

FIG. 14 is a flowchart showing a receiving broadcast station switching process considering a route in the case of one tuner.

FIG. 15 is a flowchart showing a receiving broadcast station switching process in consideration of a route in the case of two tuners.

[Explanation of symbols]

10 antennas, 12 tuners, 14 FM multiplex decoders, 16 data processing units, 18 memory units, 20 display units, 22 level determination units, 24 navigation devices.

Claims (4)

[Claims] 1. A broadcast data receiving apparatus for obtaining traffic information from radio waves from a broadcasting station, the receiving means for receiving the radio waves transmitted from the broadcasting station, and the broadcasting for changing the reception frequency and searching for the broadcasting station. Station search means, reception content recognition means for recognizing the data content of the traffic information data of the searched broadcasting station, and broadcasting station selection means for selecting the broadcasting station to be selected next based on the recognized data content. A broadcast data receiving apparatus comprising: 2. The apparatus according to claim 1, wherein the broadcast station selection means selects a broadcast station having the same content next when a broadcast from a predetermined substitute broadcast station cannot be received. A broadcast data receiving device characterized by being selected as a broadcast station to be used. 3. The apparatus according to claim 1, further comprising a current position recognition means, wherein the broadcasting station selection means determines a place according to the recognized current position, and traffic information about this place. A broadcast data receiving device, characterized in that a broadcast station that provides the above is selected as a broadcast station to be selected next. 4. The apparatus according to claim 3, further comprising route setting means, wherein the broadcast station selecting means determines a place according to a current position and a route and provides traffic information about this place. A broadcast data receiving device, characterized in that a broadcasting station which is currently selected is selected as a broadcasting station to be selected next.