JPH08335856A - Broadcasting reception equipment - Google Patents

Abstract

PURPOSE: To perform the optimum channel selecting operation in combination with a GPS reception equipment even at the time when a radio wave of ground broadcasting cannot be received by providing a specific satellite radio wave reception discrimination means and a specific control part for channel selection and tuning. CONSTITUTION: A key input part 6, a storage part 7A consisting of a map data storage part 7B and a storage part 7C for channel selection, a display part 9, and an antenna 11 for radio are provided, and a radio reception part 10 in which a means to discriminate the reception state of the broadcasting radio wave is incorporated is connected to a data processing part 8A. A control part 8B for channel selection and tuning included in the data processing part 8A issues a required command signal for channel selection and tuning to the radio reception part 10 when the radio wave from GPS is received in a satellite radio wave reception discrimination means 12. The control part 8B continues to receive the broadcasting received at present without issuing the required command signal for channel selection and tuning to the radio reception part 10 when the radio wave from GPS is not received in the satellite radio wave reception discrimination means 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in combination with a GPS receiver mounted on a mobile body, makes it possible to perform an optimum channel selecting operation even when a radio wave for terrestrial broadcasting cannot be received. In particular, it relates to an FM multiplex broadcast receiver.

[0002]

2. Description of the Related Art In the prior art, when used in combination with a navigation device, the navigation device stores a receivable radio broadcasting station corresponding to the current position in the map data, which causes a bad reception condition. In that case, it has been reported that the channel is selected based on the information from the navigation device (Japanese Patent Laid-Open Publication No. 1-175699).

This prior art will be described in detail with reference to FIG. 3. Reference numeral 3 denotes a GPS antenna for receiving satellite radio waves.
The output side of the antenna 3 is connected to the GPS receiver 4. Reference numeral 1 is a mileage sensor, and 2 is an azimuth sensor, which are connected to the output side of the GPS receiving section 4 and the position detecting section 5. The output side of the position detecting section 5 is connected to the data processing section 8A, and the key input section 6, the storage section 7A including the map data storage section 7B and the tuning storage section 7C, and the display section 9 are provided. , And a radio receiving unit 10 including a radio antenna 11 is connected to the data processing unit 8A. Then, the tuning / tuning control unit 8B included in the data processing unit 8A issues a required tuning / tuning command signal to the radio receiving unit 10 and a required tuning / tuning command signal to the display unit 9. The update determination unit 8C determines whether or not the corresponding map data needs to be updated when the current position changes as the mobile body moves. It is a thing.

Similarly, when the reception condition deteriorates, the alternative frequency list included in the multiplex signal is referred to, the alternative frequency is selectively tuned, and if there is no suitable broadcasting station in the alternative frequency list, another broadcasting station is selected. It has also been reported that a channel is selected (Japanese Patent Laid-Open No. 1-125128).

[0005]

In the conventional broadcast receiving apparatus, when a moving body travels in a tunnel or the like which cannot receive broadcast radio waves, it may be an area in which the broadcast radio waves cannot be received, or it may be temporarily affected by the tunnel. I cannot distinguish whether it is a phenomenon. Therefore, when the radio wave of the broadcast is interrupted, for example, an FM multiplex broadcast receiver used in combination with the navigation device receives data from the navigation device in order to effectively receive data such as traffic information multiplexed in the broadcast. Select the designated broadcasting stations in sequence, and check the availability of broadcasting and the presence of multiple broadcasting. Even if the FM multiplex broadcast receiver is used alone,
By referring to the alternative frequency list included in the multiplex signal, the alternative frequency is selectively tuned, and the availability of broadcast reception and the presence or absence of multiplex broadcast are confirmed. Such actions will occur. Of course, if there is no suitable broadcasting at the designated broadcasting station (frequency), a tuning operation such as searching for all frequencies is performed.

[0006] In this case, if the broadcasting radio wave is interrupted due to a tunnel or the like, a completely useless tuning operation is performed. In addition, even when the tunnel is left and reception is possible again, a series of During the tuning operation, there is a problem that the station before entering the tunnel cannot be quickly selected. The present invention has been made in view of these points.
Even when the broadcast wave cannot be received, it is correctly determined whether it is due to the influence of a tunnel or the like or the weakening of the radio wave of the broadcasting station being received, and the unnecessary tuning operation is performed. It is possible to suppress the occurrence.

[0007]

In a broadcast receiving device used in combination with a GPS receiving device mounted on a mobile body, whether a radio wave receiving condition is present or not depending on a receiving condition of a GPS receiving device receiving a radio wave from a satellite. A satellite radio wave reception judging means for judging whether the radio wave is received, a radio receiving section having a built-in judgment means for judging the reception status of the broadcast radio wave, and a reception of the broadcast by the reception status judging means in the satellite radio wave receivable state by the satellite radio wave reception judging means When the state is bad, the radio wave is selected by switching, and when the satellite radio wave reception determination means cannot receive the satellite radio wave, when the reception state of the broadcast by the reception state determination means is poor, the immediately previous radio wave is continuously selected. The broadcast receiving apparatus is characterized by comprising a tuning / tuning control unit.

[0008]

According to the above construction, even if the reception condition is deteriorated due to a tunnel or the like, by referring to the reception condition of the GPS receiver, it is possible to eliminate the unnecessary tuning operation and exit the tunnel. In this case, it becomes possible to restart the reception of the broadcast quickly and minimize the loss of the data of the FM multiplex broadcast.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. An example of a hardware configuration is shown in FIG. 1 and a specific processing flow is shown in FIG. First, the reception status is checked to determine whether to perform the tuning operation. The trigger for transitioning to this operation may be, for example, a timer that is activated at regular intervals.

That is, in FIG. 1, 3 is a GPS antenna for receiving satellite radio waves.
The output side of is connected to the GPS receiver 4. 1 is a mileage sensor, 2 is an azimuth sensor, these are GPS
One of the output sides of the receiving section 4 is connected to the position detecting section 5, and the other of the output sides of the GPS receiving section 4 is connected to the data processing section 8A via the satellite radio wave reception judging means 12. There is. The output side of the position detecting section 5 is connected to the data processing section 8A, and the key input section 6, the storage section 7A including the map data storage section 7B and the tuning storage section 7C, and the display section 9 are provided. , And a radio antenna 11, and a radio receiving section 10 having a built-in means for discriminating a reception state of broadcast radio waves is connected to the data processing section 8A. The tuning / tuning control unit 8B included in the data processing unit 8A makes a necessary tuning for the radio receiving unit 10 when the satellite radio wave reception determining unit 12 receives the radio wave from the GPS. When the satellite radio wave reception determination means 12 does not receive the radio wave from the GPS, the radio wave reception unit 10 does not issue the required tuning / tuning command signal.
It is designed to continuously receive the broadcast being received. The memory unit 7C for tuning is for supplying necessary tuning command-related data, but when searching all frequencies described later without having tuning data (S25 to S30 in FIG. 2), it is not always necessary. You don't have to. The update determination unit 8C is for determining whether or not the corresponding map data needs to be updated when the current position changes as the mobile body moves.

Whether the reception state is good or bad may be judged by the reception level of FM broadcasting, the size of noise or the size of distortion, or in the case of multiplex broadcasting, the error rate of data when demodulated. Here, as shown in FIG. 2, if the reception state is better than the reference value, it is not necessary to redo the channel selection and the process can be performed as it is (S22). If the reception state is worse than the reference value, the GPS The state of reception of radio waves from the satellite is referred to (S23). Since 20 or more GPS satellites are in operation, it is possible to constantly capture radio waves from nearly 10 satellites. Therefore, the situation in which the radio waves from the satellite cannot be captured at all is rare even when traveling under the overpass. Therefore, if the radio waves from the satellite have not been captured at all, it is possible that the vehicle is traveling in a tunnel or entering an indoor parking lot, so the channel selection operation is not performed (S24). On the contrary, if the radio waves from the GPS satellites have been captured, it is determined that the reception state of the terrestrial broadcast has deteriorated, and the search for a substitute terrestrial broadcast is started (S25). The search process is performed for all bands. Specifically, in Japan, in the case of FM broadcasting, the band is 76-9.
Since the frequency is assigned in units of 0.1 MHz at 0 MHz, it is determined in order from 76 MHz whether the reception state is better than the reference value (S27). It is confirmed whether or not the FM multiplex broadcast is being performed for the broadcast whose reception state is equal to or higher than the reference value. If the FM multiplex broadcast is being performed, the frequency and the reception state are stored (S29) and the next frequency is set. Move.
When the search for all frequencies is completed in this way (S3
0), and the frequency with the best reception state is selected from among them (S31). If there is no broadcast whose reception state exceeds the reference value, the previous frequency is selected and the process ends (S32).

Further, the GPS receiving device is often built in the navigation device as a position detecting means of the moving body. Since the FM multiplex broadcast receiving device can also obtain traffic information such as traffic jam information and construction / accident information, it can be considered to be built in the navigation device.
When the GPS receiving unit and the broadcast receiving unit are built in the same device, and are operating on one CPU, it is not necessary to provide a special communication interface, and when the receiving state of the broadcast falls below the standard, Referring to the GPS reception status,
Specifically, the memory that stores the reception state may be read to determine the state.

In the embodiment, the reception situation of FM multiplex broadcasting has been described, but it goes without saying that it can be applied to AM broadcasting and television.

[0014]

As described above, according to the present invention, when the radio wave is interrupted due to a tunnel or the like and the reception state is deteriorated, the reception state of the GPS receiver is referred to and the reception state is deteriorated. By determining whether the broadcast receiving device is caused by the influence of a tunnel or the like or is unique to the station due to being far away from the station, the broadcast receiving apparatus can prevent unnecessary tuning operation. In addition, when exiting from the tunnel, the reception of the broadcast can be restarted quickly, and the loss of the broadcast data can be minimized. Also, GP
When it is used by being incorporated in a navigation device having an S reception section and a broadcast reception section, it is possible to perform appropriate broadcast reception processing without providing a special communication interface.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a broadcast receiving device according to an embodiment.

FIG. 2 is a schematic diagram of a flow showing the present embodiment.

FIG. 3 is a schematic diagram of a broadcast receiving device showing a conventional example.

[Explanation of symbols]

 1: Travel distance sensor 2: Direction sensor 3: GPS antenna 4: GPS receiving unit 5: Position detecting unit 6: Key input unit 7A: Storage unit 7B: Map data storage unit 7C: Channel selection storage unit 8A: Data processing unit 8B: Tuning / tuning control unit 8C: Update determination unit 9: Display unit 10: Radio reception unit 11: Radio antenna 12: Satellite radio wave reception determination means In the drawings, the same reference numerals indicate the same or corresponding portions.

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Claims (2)

[Claims] 1. In a broadcast receiving device used in combination with a GPS receiving device mounted on a mobile body, a satellite for judging whether or not it is in a radio wave receiving state based on a receiving state of a GPS receiving device for receiving a radio wave from a satellite. When the reception state of the broadcast by the reception state determination means is bad in the radio wave reception determination means and the radio reception section having the reception state determination means for the broadcast radio wave in the satellite radio wave reception determination state Select a radio wave by switching to, and when the satellite radio wave reception determining means cannot receive the satellite radio wave and the reception state of the broadcast by the reception state determining means is poor, the last radio wave is continuously selected. A broadcast receiving device comprising a tuning control unit. 2. The broadcast receiving device according to claim 1, wherein the radio wave is an FM radio wave, and the broadcast receiving device is an FM multiplex broadcast receiving device.