JPS5851697B2 - Traffic information broadcast system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traffic information broadcasting station that sequentially broadcasts traffic information for a plurality of districts, an on-vehicle receiving device that receives this information, and particularly to a district selection method thereof.

FIG. 1 is a block diagram showing an example of a conventional traffic information broadcasting system. In the figure, 10 is a traffic information broadcasting station;
11 is a plurality of traffic information sources broadcasted by this traffic information broadcasting station; 12 is a reception area designation signal generator that designates a plurality of reception areas in which this traffic information is broadcast; 13 is this reception area designation signal and the above-mentioned traffic information. 20 is an on-vehicle receiver that receives this broadcasted traffic information, 21 is a receiver that receives radio waves from the transmitter, and 22 detects a reception area designation signal from the output of this receiver. a reception area designation signal detector; 23, a manual area code setter for designating area code selection; 24, a matching circuit for matching the set value of this area code setter with the output of the reception area designation signal detector; 25 is a gate circuit that opens an audio circuit with the output of this matching circuit, and 26 is an audio device that amplifies the output from this gate circuit and outputs audio from a speaker.

A conventional traffic information broadcasting device is configured as described above, and a traffic information broadcasting station 10, which is a fixed equipment on the ground, generates a reception area designation signal as a traffic information source 11, such as an audio tape announcement, within the audio frequency band. The signal from the transmitter 12 is broadcast by the transmitter 13 out of band.

When a driver or passenger in a car wants to obtain traffic information, they should look at the area code displayed like a road sign on the side of the road,
Alternatively, the rotary switch or the like of the area code setting device 23 is manually set based on a previously known area code.

The set area code and the output of the received reception area designation signal detector 22 are compared in a matching circuit 24, and if they match, the gate circuit 25 is opened and the traffic information corresponding to the area code is transmitted to the audio device. It is output from 26.

However, the driver or passenger must manually set the area code without making any mistakes, and the setting must be changed every time the vehicle moves and the area code changes. However, the disadvantage of listening to broadcasts from a completely different region without knowing it was that they were broadcasting from a completely different region.

'The object of the present invention is to provide a traffic information system that eliminates the troublesomeness of manual settings and errors in settings as described above, and allows the user to automatically listen to necessary traffic information.

FIG. 2 is a block diagram showing an embodiment of the present invention, and numerals 10 to 13, 21, 22, and 24 to 26 are completely the same as the conventional device shown in FIG.

Reference numeral 30 denotes a plurality of small zone distributed transmitting stations (FIG. 2 shows only one station) that transmit regional signals to small zones near the local station in order to indicate the area to which traffic information is applied.

), 31 is a local signal generator that generates the local signal of this distributed transmitting station, 32 is a local signal transmitter that transmits the local signal from this local signal generator 31, 20A is the on-vehicle receiving device of the present invention, 27 28 is a regional signal receiver that receives the radio waves transmitted from the distributed transmitting station; 28 is a regional signal detector that detects regional signals from the output of this receiver 27; and 29 is a regional signal detector that detects the regional signal from the output of this receiver 27; This is a storage device that holds data until a regional signal is received.

In the traffic information broadcasting system configured as described above, the traffic information broadcasting station 10 sequentially broadcasts traffic information for a plurality of small zones and reception area designation signals throughout the large zone.

When a running vehicle enters a certain small zone, the transmitted waves from the distributed transmitting station 30 in the small zone area are transmitted to the local signal receiver 27.
The local signal detector 28 detects the local signal and stores it in the storage device 29.

On the other hand, the receiver 21 receives radio waves from the traffic information broadcasting station 10, and reception area designation signals sent sequentially are detected by a reception area designation signal detector 22.

When the reception area designation signal sent sequentially matches the area signal stored in the storage device 29, the multiple circuit 24 opens the gate circuit 25 and transmits the traffic information of that area from the receiver 21 to the audio device 26. Output from

Note that as the transmission format of the regional signal and the reception area designation signal, either an analog system using tone signals or a digital system that modulates subcarriers can be used.

Although radio waves are used as the transmission means in the above embodiments, other transmission means such as magnetism, ultrasonic waves, light, etc. may also be used.

Although a storage device 29 is provided in FIG. 2, it may not be necessary if the service area of the small zone is wide.

Further, the signal format of the regional signal from the regional signal generator 31 does not necessarily have to be the same as the signal format of the receiving region designation signal, but the regional classifications must match.

Therefore, the number of distributed transmitting stations 30 corresponds to the classification of reception area designation signals and regional signals.

Further, it is also possible to include a reception area designation signal that designates a plurality of reception areas in correspondence with the same traffic information in the reception area designation signal information.

Furthermore, the audio device 26 can also be used in common with an existing car radio or the like for interrupt reception.

In the above embodiment, the traffic information and the reception area designation signal are frequency-divided into and out of the voice band and transmitted, but it goes without saying that they can also be transmitted in a time-division manner.

As explained above, the present invention has the effect of automatically and error-freely obtaining information specific to the region in which a vehicle is operating.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional traffic information broadcasting system, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, 10 is a traffic information broadcasting station, 11 is a traffic information source,
12 is a reception area designation signal generator, 13 is a transmitter, 20.
20A is an on-board receiving device, 21 is a receiver, 22 is a reception area designation signal detector, 24 is a -/number circuit, 25 is a gate circuit, 26 is an audio device, 27 is a local signal receiver, and 28 is a local signal detection device. 29 is a storage device, 30 is a distributed transmission station, 31
is a local signal generator, and 32 is a local signal transmitter. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A plurality of small zone distributed transmitting stations that transmit regional signals to small zones near the own station to indicate areas to which traffic information is applied;
A large zone traffic information broadcasting station that sequentially transmits traffic information for the plurality of small zone areas and corresponding reception area designation signals, and a traffic information broadcasting station that receives signals from this traffic information broadcasting station and the distributed transmission station. an on-vehicle receiving device that outputs traffic information in the signal of the traffic information broadcasting station while the reception area designation signal in the signal of the above and the regional signal of the signal of the distributed transmission station indicate the same area. A transportation and information broadcasting system characterized by: 2. The traffic information broadcasting system according to claim 1, wherein the traffic information broadcasting station simultaneously transmits traffic information and a receiving area designation signal using a frequency division method. 3. The traffic information broadcasting system according to claim 1, wherein the traffic information broadcasting station transmits the traffic information and the receiving area designation signal in series in a time division manner.