JPS59138140A - Traffic information broadcast system - Google Patents

Abstract

PURPOSE:To attain ease of receiving of the broadcast in the progressing direction without complicated tuning operation of a receiver by starting the receiving of a traffic information broadcast only when the receiving is performed in the order of a trigger signal and an identification signal at the same frequency. CONSTITUTION:A broadcast section Y is determined on a road, and a start point position identification signal transmission antenna 10, running direction identification signal transmission antenna 12, and a traffic information broadcast transmission antenna 14 are arranged sequentially from a start point Xs to an end point XE. A start position identification signal (trigger signal) 100, running direction identification signal 102, and a traffic information broadcast 104 are transmitted, respectively at the same frequency from each antenna. When a car runs on the section Y, the trigger signal 100 is received at first, then the identification signal 104 is transmitted and finally the traffic information broadcast is received automatically. Thus, the traffic information in the progressing direction is received automatically without complicated tuning operation.

Description

[Detailed Description of the Invention] Field of Application of the Invention The present invention relates to a traffic information broadcasting system in which traffic information broadcasted by an antenna installed on the road side is received by an on-vehicle receiver and traffic information is provided to a driver. Related 6 Conventional technology is being experimented and operated in order to establish a smooth transportation system.

Conventional systems generally target a certain section of one route, and use two types of frequencies to receive traffic information ahead in the direction of vehicle travel. Therefore, the driver can obtain traffic information in the direction in which the vehicle is traveling by tuning the in-vehicle receiver to the frequency of traffic information broadcast for the direction in which the vehicle is traveling.

However, in the future, if this type of system is deployed over a wide area within a city and the roads intersect in a complex manner, if the conventional system is applied as is, the driver will receive traffic information about the direction of the vehicle. Therefore, the on-vehicle receiver must be tuned frequently. On the other hand, providing an on-vehicle receiver with an automatic tuning function in order to reduce this operational effort has the disadvantage of significantly increasing the cost.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a traffic information/broadcasting system that allows easy reception of information broadcasts.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a starting point position marker signal transmitting antenna, a driving direction identification signal transmitting antenna, and a traffic information broadcast transmitting antenna that transmit at the same frequency on a road of a predetermined length. The on-vehicle receiver starts receiving the traffic information broadcast when the starting point sign signal and the driving direction identification signal are received in that order.

Embodiments of the Invention A preferred embodiment of the traffic information broadcasting system according to the present invention will be described below with reference to the drawings.

FIG. 1 explains the roadside broadcasting equipment for one-sided traffic lanes, in which a vehicle travels in the X direction.

In the figure, a road section Y from a starting point X-8 to an ending point XE is defined as a broadcast section.

Further, from the starting point XS to the ending point XE, the antenna 10 for transmitting the starting point position marker signal. An antenna 12 for transmitting a driving direction identification signal and an antenna 14 for transmitting traffic information broadcasting are arranged in sequence, and the antenna 1° is a starting point position indicator signal (hereinafter a trigger signal) for a receiver mounted on a vehicle traveling on this road. The antenna 12 transmits a traveling direction identification signal (hereinafter referred to as the identification signal) 102, and the antenna 1
4 can each transmit traffic information broadcast 104 on the same frequency. The driving direction identification signal 102 and the traffic information broadcast 104 are always broadcast as a pair, and the two are collectively referred to as a message sent 106.

The trigger signal 100 is always transmitted, and the identification signal 102 is transmitted only while the traffic information broadcast 104 is being transmitted. Therefore, as can be understood from FIG. 2, when a vehicle travels in a broadcast section Y where traffic information broadcasting is performed, the trigger signal 100 is first received, then the identification signal 102 is received, and finally the traffic information broadcast 104 is received by the vehicle. The message sent 106 is sequentially caught by the receiving antenna of the aircraft, and when driving in a broadcasting section Y where traffic information broadcasting is not performed, only the trigger signal 100 is caught and the identification signal 102 and traffic information broadcasting 104 are combined as a set. Not caught.

FIG. 3 explains the configuration of the in-vehicle receiver, in which the induced voltage of the receiving antenna 16 is supplied to the radio tuner 18 and traffic information broadcast tuner 20.

The two radio tuners 18 are for receiving general radio broadcasts, and the traffic information broadcast tuner 20 is for receiving the traffic information broadcast 104, and the tuner output 108 of the radio tuner 18 is sent to a switching circuit 22. Further, the tuner output 110 of the traffic information tuner 20 is supplied to the switching circuit 22 and the determination circuit 24, respectively.

The determination circuit 24 issues a switching command 1 according to the tuner output 110.
12 can be outputted to the switching circuit 22, and the switching circuit 22 can switch and output the tuner output 108 and the tuner output 110 to the AM detection circuit 26 according to this switching command 112.

The detection output of the AM detection circuit 26 is supplied to a speaker 30 via an amplifier circuit 28, and the speaker 30 reproduces and outputs general radio broadcasts or traffic information broadcasts.

The traffic information broadcasting system according to the present invention has the above configuration, and its operation will be explained below with reference to the flowchart shown in FIG.

It is determined in step 200 whether or not the driver has turned on the power switch of the in-vehicle receiver. If the switch has not been operated, the receiving operation of the in-vehicle receiver is stopped in step 202, and the switch is turned on. When the operation is performed, the flag of the determination circuit 24 is set to 0 in step 204.

When the 7lag of the determination circuit 24 is set to 0 in step 204, the antenna 10 receives the selected general radio broadcast in step 206, and the determination circuit 24 performs a determination process. That is, at this time, the switching circuit 22 is switching output of the tuner output 108, so that the speaker 30 reproduces and outputs general radio broadcasting and does not reproduce and output traffic information broadcasting.

Then, in step 208, the input signal to the traffic information broadcast tuner 20 is set to a predetermined frequency (same as the traffic information broadcast frequency).
If it is determined that there is such an input signal, the process proceeds to step 210, and if it is determined otherwise, the process returns to step 206.

The input signal that satisfies the conditions of step 208 above is the trigger signal 100. Identification signal 102. Since the traffic information broadcast 104 has the same frequency, the trigger signal 100 .
Or a trigger signal 100 in the reverse direction when the message set 106 is not being transmitted, or a traffic information broadcast 104 in the reverse direction.

Therefore, first in step 210, the above input signal is triggered.
It is determined whether the signal 100 (indicated by T in FIG. 4) is present.

When it is determined in step 210 that the input signal is the trigger signal 100, the flag is set to 1 in steps 21.2 and 214, and the process returns to step 206, where the next identification signal 102 is received while receiving general radio broadcasting. is waited for in step 210.

Also, in step 210, the input signal is the trigger signal 100.
If it is determined not to be the case, the process proceeds to step 216, where it is determined whether the input signal is the identification signal 102 (represented by C in FIG. 4).

When it is determined in step 216 that the input signal is not the identification signal 102, the processing in step 218 is performed, the flag is set to O, and the transformation information broadcasting tuner 20 enters the reception standby state again.

If it is determined in this step 216 that the input signal is the identification signal 102, the process proceeds to step 220, where it is confirmed whether the flag in steps 212 and 214 has been set to 1 or not.

If this flag is determined to be 0 in step 220, it means that the trigger signal 100 was not received before the umbrella-specific signal 102 was received, so the process of step 218 is performed.

Further, when it is determined in step 220 that the flag is 1, the trigger signal 100. Once the identification signal 102 has been received, the process proceeds to the next step 222.

In the above step 222, the determination circuit 24 receives the switching command 112.
is output to the switching circuit 22, and the switching circuit 22 switches and outputs the tuner output 110 to the AM detection circuit 26 in response to this switching command 112. As a result, in step 224, the traffic information broadcast 104 is received and reproduced, and as a result, traffic information ahead in the direction of travel of the vehicle can be heard.

The traffic information broadcast is received as described above, and the level of the traffic information broadcast 104 is constantly monitored in step 226. When the traffic information broadcast 1040 level is higher than the level L in step 226, the traffic information broadcast 104 can be received with good quality, so the reception continues. Further, when the level of the traffic information broadcast 104 becomes lower than the level L as when passing through section Y, step 228
Then, the tuner output 108 of the radio tuner 18 is again switched and outputted from the switching circuit 22 to the AM detection circuit 26, and the normal broadcast reception state is restored.

As explained above, according to this embodiment, reception of the traffic information broadcast 104 is automatically started only when the trigger signal xoo and the identification signal 102 are received in that order on the same frequency. Traffic information necessary for driving in the direction of travel can be heard without complicated tuning interpolation of the receiver.

Furthermore, since the trigger signal 1004, identification signal 102, and traffic information broadcast 104 are on the same frequency, it is also possible to effectively utilize radio waves.

Furthermore, when listening to the traffic information broadcast of the opposite lane, since it is easy to receive the broadcast of the direction of travel, the effort required for the tuning operation can be reduced compared to the conventional system.

In addition, the current in-vehicle receiver has a switching circuit 22 and a determination circuit 24.
It is also preferable to configure the device of the present invention by later attaching an adapter having the function of identifying the traveling direction as described above.

As described above, according to the present invention, it is possible to provide a traffic broadcasting system in which tuning to traffic information broadcasting can be easily performed and radio wave utilization efficiency can be improved. Therefore, it is also possible to quickly realize a transportation system in which this type of system is introduced.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of roadside broadcasting equipment in the system according to the present invention, Fig. 2 is a waveform diagram of the signal transmitted from the broadcasting equipment in Fig. 1, and Fig. 3 is an illustration of the on-board receiver in the system according to the present invention. The block diagram and FIG. 4 are flowcharts for explaining the operation of the on-vehicle receiver of FIG. 3. 10... Starting point position indicator signal transmission antenna 12...
Traveling direction identification signal transmission antenna 14...Traffic information broadcasting transmission antenna 16...Receiving antenna 18...Radio tuner 20...Traffic information broadcasting tuner 22...Switching circuit 24...Determination circuit substitute Atsushi Nakajima, Patent Attorney

Claims (1)

[Claims] (1) An antenna for transmitting a starting point position marker signal, an antenna for transmitting a driving direction identification signal, and an antenna for transmitting traffic information broadcasting, which transmit at the same frequency, are arranged sequentially from the starting point of a broadcast section covering a road section of a predetermined length. A traffic information broadcasting system characterized in that the in-vehicle receiver starts receiving traffic information broadcasting when a starting point sign signal and a driving direction identification signal are received in this order.