JPH09247019A - On-vehicle fm multiplex receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a list of reception available broadcast stations from which a teletext multiplex broadcast program is received at a current position by providing an information storage means storing teletext multiplex service area information as a coordinate and an entry means or the like obtaining coordinate information of a current position from a GPS car navigation system. SOLUTION: A service area information storage means 7 is composed of a ROM or the like and stores a teletext multiplex service map of a broadcast station conducting the national teletext multiplex broadcast service. A GPS navigation system 9 is made up of a GPS reception section 10 and a display section 11. An entry means 8 enters a current position coordinate from the GPS reception section 10 to play the roll of sending the coordinate information to an arithmetic processing means 5. The arithmetic processing means 5 retrieves the same coordinate as the current position coordinate obtained by the GPS reception section 10 from a service area information storage means 7 to extract station names and frequencies of all the broadcast stations covering the coordinate as their service area and displays them on a teletext display means 6.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an on-vehicle FM multiplex receiver.

[0002]

2. Description of the Related Art FIG. 2 shows a block diagram of a conventional vehicle-mounted FM multiplex receiver. In a conventional on-vehicle FM multiplex receiver, a high frequency signal received by an antenna 201 is demodulated by an FM receiving section 202 and a demodulated signal is taken out, and the demodulated signal is stereo demodulated by an audio reproducing means 203 and an audio signal is taken out and output. Let On the other hand, the character information demodulation means 204 extracts character information from the demodulated signal and outputs it to the character display means 206 via the control means 205 to display the character information.

When selecting a station, the broadcasting station information storage means 2
In 07, the station names and frequencies of the receivable broadcasting stations, which are classified into each block area obtained by dividing the whole country into several blocks, are stored. The control unit 205 selects the block area to which the current position belongs. The control unit 205 extracts the frequencies of the broadcasting stations that can be received at the current position from the broadcasting station information storage unit 207, and sequentially controls the reception frequencies of the FM receiving unit 202 to select a channel. At that time, the station name of the receiving station is output to the character display means 206.

[0004]

However, in the present situation that there are few broadcasting stations providing the character multiplex broadcasting service and the service area of the character multiplex broadcasting is narrower than that of the normal stereo audio broadcasting, the conventional FM for vehicle mounting is used. When it is desired to receive the character multiplex broadcasting, the multiplex receiver cannot (1) know which broadcasting station is providing the character multiplex broadcasting service.

(2) Since it is impossible to know whether the current position is within the character multiplex broadcasting service area of the broadcasting station, there is a problem that it takes time to select the station and obtain the character information.

[0006]

Therefore, a vehicle-mounted F of the present invention is provided.
In the M multiplex receiver, firstly, service area information storage means capable of storing character multiplex service area information of a broadcasting station as coordinates, and input capable of obtaining coordinate information of the current position from the GPS car navigation system. It has a means and an arithmetic processing means 5, and can display a list of broadcasting stations that can receive the character multiplex broadcasting at the current position on the character display section.

Secondly, the character multiplex service area information stored in the service area information storage means is sequentially updated based on the record information that it was actually receivable or impossible at that point. , A configuration that can always obtain a more accurate broadcasting station list.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an on-vehicle FM multiplex receiver of the present invention will be described below with reference to the drawings. FIG.
It is a block diagram of the vehicle-mounted FM multiplex broadcast receiver concerning this invention. The antenna 1, the FM receiving means 2, the voice reproducing means 3 and the character information demodulating means 4 of FIG.
1, the FM receiving unit 202, the voice reproducing unit 203, and the character information demodulating unit 204 have the same functions and operations, and therefore the description thereof will be omitted.

In FIG. 1, the service area information storage means 7 is composed of a ROM, a CD-ROM, an EEPROM, a digital disk or the like, and a character multiplex service area map of a broadcasting station which provides all character multiplex broadcasting services nationwide. Is memorized. Whether the service area information storage means 7 is composed of a read-only memory such as a ROM or a CD-ROM, or a writable non-volatile memory such as an EEPROM, a writable digital disk, or the like is determined by the invention described later. It depends on whether or not the configuration also includes. The content of the information stored in the service area information storage means 7 is in the form of a list of broadcasting stations whose position is a character multiplex service area for position information expressed in the form of coordinates of east longitude and north latitude. , Stores the station name and frequency of each broadcasting station. Also,
The in-vehicle GPS navigation system 9 receives a radio wave from a satellite and calculates a precise position of the current vehicle, and a display unit 11 for displaying the position as a position on the map. It is configured.

The input means 8 serves as an interface which receives the current position coordinates from the GPS receiving section 10 and sends the coordinate information to the arithmetic processing means 5. The arithmetic processing means 5 searches the service area information storage means 7 for the same coordinates as the current position coordinates obtained by the GPS receiving section 10, and the station names and frequencies of all the broadcasting stations whose coordinates are within the service area. Is taken out and displayed on the character display means 6. At the same time, the FM receiving means 2 is controlled to receive the frequency of one station selected from the list. When it is desired to change the broadcasting station, the broadcasting station can be sequentially changed by an operation means (not shown).

Due to the limited capacity of the service area information storage means 7, the coordinates to be stored are discrete like a mesh. Therefore, the coordinates of the current position of the vehicle are not always stored as information in the service area information storage means 7. In this case, the arithmetic processing means 5 searches for the closest coordinates in order to substitute the data of the coordinates stored in the service area information storage means 7 which is the closest to the coordinates of the current position of the vehicle. In the present embodiment, the east longitude and north latitude data of the current position coordinates of the vehicle and the east longitude and north latitude data of the coordinates stored in the service area information storage means 7 have the minimum sum of squares of the respective differences. Information is substituted, but the invention is not so limited.

In the above description, the vehicle-mounted F of the present invention is used.
The service area information storage means 7 of the M multiplex receiver is a ROM
A read-only memory such as a CD-ROM or a CD-ROM was sufficient. These storage means are inexpensive and have a large capacity. Next, the case where the character information demodulation means 4 cannot reproduce the character information, that is, the case where the FM multiplex broadcast cannot be properly received will be described. Further, a case will be described in which the FM multiplex broadcast is well received, but the data of the broadcasting station that can be received is not stored in the data of the coordinates of the point stored in the service area information storage means. .

In these cases, the service area information storage means 7 is a writable storage means such as EE.
A PROM, a digital disk or the like is used. When the FM multiplex broadcast cannot be properly received, the arithmetic processing means 5
Is stored in the service area information storage means 7,
The station name and frequency that could not be received are deleted from the station list at the coordinates of the point. In addition, when receiving a teletext, the current position information is always taken in from the GPS navigation system 9 and the currently receiving broadcasting station is included in the list of receivable broadcasting stations in the service area information storage means 7. Check if there is, and if not, add the station name and frequency of the receiving station.

In the above description, in order to simplify the explanation, the coordinates stored in the service area information storage means 7 are treated as points, but in reality, the vehicle is positioned within a predetermined radius of the coordinate points. It goes without saying that the car is treated as if it were at that coordinate point.

[0015]

As described above, according to the present invention, in the vehicle-mounted FM multiplex receiver, the service area information storage means capable of storing the character multiplex service area information of the broadcasting station as coordinates and the GPS car navigation system are used. Since the input means capable of obtaining the coordinate information of the current position and the arithmetic processing means are provided, the following effects can be obtained.

(1) It is possible to display a list of broadcasting stations that can receive the character multiplex broadcasting at the current position on the character display section. (2) Furthermore, the character multiplex service area information stored in the service area information storage means is sequentially updated on the basis of the actual result information indicating whether the reception is possible or impossible at that point, and it is always better. You can get an accurate list of stations.

[Brief description of drawings]

FIG. 1 is a block diagram of an in-vehicle FM multiplex receiver according to the present invention.

FIG. 2 is a block diagram of a conventional vehicle-mounted FM multiplex receiver.

[Explanation of symbols]

 1 antenna 2 FM receiving means 3 voice reproducing means 4 character information demodulating means 5 arithmetic processing means 6 character displaying means 7 service area information storing means 8 input means 9 GPS navigation system 10 GPS receiving section 11 display section 201 antenna 202 FM receiving Part 203 Voice reproduction means 204 Character information demodulation means 205 Control means 206 Character display means 207 Broadcast station information storage means

Claims (2)

[Claims] 1. An FM teletext broadcast is received and demodulated,
An in-vehicle FM multiplex receiver for displaying information on a character display means, a service area information storage means for storing character multiplex service area information of a broadcasting station as coordinates, and a GP.
From the input means for obtaining the coordinate information of the current position from the S car navigation system, and the character multiplex service area information and the coordinate information of the current position, a list of broadcasting stations that can receive the character multiplex broadcast at the current position is obtained. An in-vehicle FM multiplex receiver, comprising: an arithmetic processing unit that controls to display on a character display unit. 2. A character multiplex service in which the arithmetic processing means is stored in the service area information storage means based on the record information that FM multiplex broadcasting was receivable or impossible at the point where the vehicle is located. The on-vehicle FM multiplex receiver according to claim 1, wherein the area information is controlled so as to be sequentially updated.