JPH07260504A - On-vehicle navigation device - Google Patents

Abstract

PURPOSE:To automatically select a station of an identical broadcasting content when radio sensitivity is lowered by providing a radio receiving device and a navigation device systematically connected to each other. CONSTITUTION:In the case where receiving sensitivity of a radio receiving device 2 is degraded and lowered during traveling, a radio main body 22 judges this degrading state based on receiving field strength and the like to transmit a judgement signal to a CPU 13. Upon receipt of the judgement signal, the CPU 13 based on radio station frequency information fed from a reading device 14 selects a frequency of a radio station of the same broadcasting content as a radio station having been received up to present and receivable at a present position to transmit it to the main body 22 via a communication line W. The main body 22 selects the received radio station frequency to output a voice from a speaker 24. In this way, the same content broadcasting can be automatically heard without operation of a user.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted navigation device, and more particularly to a vehicle-mounted navigation device with improved operability.

[0002]

2. Description of the Related Art In conventional vehicle-mounted navigation devices,
The position of the vehicle (latitude,
(Longitude) is displayed on the display together with the map information stored in the CD-ROM or the like, so that the driving route can be visually recognized.

On the other hand, a vehicle is usually equipped with a radio receiver for receiving AM broadcast and FM broadcast in addition to a tape player and a CD player. As the vehicle travels, the reception sensitivity of the radio wave from the specific broadcasting station decreases, and if the traveling is further continued, it becomes impossible to receive the radio wave from the specific broadcasting station with sufficient sensitivity at last. In this case, the user in the vehicle operates the tuner to change the tuning frequency in order to receive the radio waves of other broadcasting stations broadcasting the same content.

By the way, in the navigation device, the CD-ROM stores the map information and the broadcasting station frequency corresponding to each position, and the broadcasting station name currently being received is read from the CD-ROM from the current position information. It can also be displayed on the display.

[0005]

As described above, in the conventional vehicle-mounted navigation device, the reception of the specific broadcasting station radio wave by the radio receiving device mounted in the vehicle is performed by changing the receiving area accompanying the traveling of the vehicle. In that case, the user must operate the tuner each time to tune (tune) to another broadcasting station frequency that is broadcasting the same content, which is a problem in terms of operability. was there.

Therefore, an object of the present invention is to provide a vehicle-mounted navigation device that enables automatic selection of a receiving broadcast station by a radio receiving device.

[0007]

In order to solve the above-mentioned problems, a vehicle-mounted navigation device of the present invention provides a radio receiving device for receiving radio waves of a broadcasting station, a vehicle position information and a map information, and the vehicle itself. A navigation device for outputting receivable broadcast station frequency information at a position, and when the reception sensitivity of a specific broadcast station frequency of the radio receiving device drops below a predetermined level, based on the vehicle position from the navigation device, It is configured to automatically select a frequency of another broadcasting station that is broadcasting the same broadcasting content as the specific broadcasting station. Further, when the radio wave of the broadcasting station cannot be received, the automatic tuning of the frequencies of other broadcasting stations broadcasting the same broadcasting contents as the specific broadcasting station is prohibited.

[0008]

According to the present invention, the radio receiving device and the navigation device are organically coupled to each other, and when the reception condition of the specific broadcasting station frequency is deteriorated, the navigation device which stores the receivable broadcasting station frequency information at the vehicle position. The other broadcasting station that is broadcasting the same contents as the above-mentioned specific broadcasting station at the own vehicle position obtained in step 1 is automatically selected. Further, when the radio wave of the broadcasting station cannot be received, the automatic tuning of the frequencies of other broadcasting stations broadcasting the same contents as the specific broadcasting station is prohibited.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of a vehicle-mounted navigation device according to the present invention. The present embodiment has a configuration in which the navigation device 1 and the radio receiving device 2 are connected via a communication line W, and the receiving (tuning) operation of the radio receiving device 2 is performed based on the information obtained from the navigation device 1. Controlled.

In the navigation device 1, the GPS
The radio signal from the GPS satellite received by the antenna 11 is input to the GPS (satellite positioning system) unit 12, and the current position information including the latitude and longitude of the vehicle is obtained. The reading device 14 reads the map information stored in the storage medium 141 such as a CD-ROM and the receivable broadcast station information in the reception area at each position. CPU13 is GPS
The map information obtained from the reading device 14 is sent to the display 15 and displayed based on the current position information from the unit 12.

In the radio receiver 2, the radio wave signal of the broadcasting station received by the radio antenna 21 is transmitted to the radio main body 22.
The well-known tuning and demodulation processing is applied to
It is amplified in 3 and reproduced and output as sound from the speaker 24.

The CPU 13 of the navigation device 1 and the radio main body 22 of the radio receiving device 2 are connected via a communication line W, and signals are exchanged with each other.

When the power is turned on, the radio main unit 22 moves to the CPU 1
The frequency data being received is sent to 3 via the communication line W. The CPU 13 uses this frequency information and the reading device 1
The broadcasting station information from No. 4 is received, the broadcasting station being received is determined from the current location information, and the broadcasting station name is displayed on the display 15. Thereafter, similar signals are exchanged every time the reception broadcast frequency is changed.

Next, while traveling, the radio receiver 2
When the reception sensitivity of No. 2 deteriorates, the radio main body 22 determines this deterioration state based on the received electric field strength and the like, and sends a determination signal to the CPU 13. Upon receiving the determination signal, the CPU 13 selects, on the basis of the broadcasting station frequency information supplied from the reading device 14, a broadcasting station frequency which has the same broadcasting content as the broadcasting station which has been received so far and which can be received at the current location. And sends it to the radio main body 22 via the communication line W. The radio main body 22 selects the received broadcasting station frequency,
Audio is output from the speaker 24. By doing so, it becomes possible to automatically listen to the broadcast of the same content without the user's operation.

If reception is impossible at a location where radio waves do not reach, such as in a tunnel, the above process is useless, so that the current location does not reach radio waves such as in a tunnel based on map information obtained from the reader 14. When it is determined that it is a point, the above operation is prohibited. The determination of the point where the radio wave does not reach can also be made by the GPS unit 12 determining the reception state of the radio wave.

[0016]

As described above, the vehicle-mounted navigation device according to the present invention can be obtained by the navigation device when the radio receiving device and the navigation device are organically coupled to each other and the reception condition of the specific broadcasting station frequency deteriorates. It becomes possible to automatically tune to another station that is broadcasting the contents of the specified broadcasting station at the vehicle's own position, and if the frequency of the specified broadcasting station cannot be received, the automatic tuning is prohibited. To eliminate unnecessary movements and improve operability.

[Brief description of drawings]

FIG. 1 is a basic configuration block diagram showing an embodiment of a navigation device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Navigation device 2 Radio receiving device 11 GPS antenna 12 GPS part 13 CPU 14 Reading device 15 Display part 21 Antenna 22 Radio main body 23 Amplifier 24 Speaker 141 Storage medium

Claims (2)

[Claims] 1. A radio receiver for receiving radio waves from a broadcasting station,
A navigation device that obtains own vehicle position information and map information and outputs receivable broadcasting station frequency information at the own vehicle position, and when the reception sensitivity of a specific broadcasting station frequency of the radio receiving device drops below a predetermined level A vehicle-mounted navigation device that automatically selects a frequency of another broadcasting station that broadcasts the same broadcasting content as the specific broadcasting station based on the position of the vehicle from the navigation device. 2. The automatic tuning of a frequency of another broadcasting station broadcasting the same broadcasting content as the specific broadcasting station is prohibited when the broadcasting station radio wave cannot be received. In-vehicle navigation device.